FlowProblemBlackoil.hpp

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// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
// vi: set et ts=4 sw=4 sts=4:
/*
  Copyright 2023 INRIA
  Copyright 2024 SINTEF Digital
 
  This file is part of the Open Porous Media project (OPM).
 
  OPM is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 2 of the License, or
  (at your option) any later version.
 
  OPM is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
 
  You should have received a copy of the GNU General Public License
  along with OPM.  If not, see <http://www.gnu.org/licenses/>.
 
  Consult the COPYING file in the top-level source directory of this
  module for the precise wording of the license and the list of
  copyright holders.
*/
#ifndef OPM_FLOW_PROBLEM_BLACK_HPP
#define OPM_FLOW_PROBLEM_BLACK_HPP
 
#include <opm/models/blackoil/blackoilmodules.hpp>
 
#include <opm/input/eclipse/EclipseState/Aquifer/AquiferConfig.hpp>
#include <opm/input/eclipse/EclipseState/Aquifer/NumericalAquifer/NumericalAquiferCell.hpp>
#include <opm/input/eclipse/EclipseState/Aquifer/NumericalAquifer/NumericalAquifers.hpp>
#include <opm/input/eclipse/EclipseState/Grid/FaceDir.hpp>
 
#include <opm/output/eclipse/EclipseIO.hpp>
 
#include <opm/simulators/flow/ActionHandler.hpp>
#include <opm/simulators/flow/FlowProblem.hpp>
#include <opm/simulators/flow/FlowProblemBlackoilProperties.hpp>
#include <opm/simulators/flow/MixingRateControls.hpp>
#include <opm/simulators/flow/NumericalAquiferEquilibrationCheck.hpp>
#include <opm/simulators/flow/OutputBlackoilModule.hpp>
#include <opm/simulators/flow/VtkTracerModule.hpp>
#include <opm/simulators/flow/HybridNewton.hpp>
#include <opm/simulators/flow/HybridNewtonConfig.hpp>
 
#include <opm/simulators/utils/satfunc/SatfuncConsistencyCheckManager.hpp>
 
#if HAVE_DAMARIS
#include <opm/simulators/flow/DamarisWriter.hpp>
#endif
 
#include <algorithm>
#include <cmath>
#include <cstddef>
#include <functional>
#include <limits>
#include <memory>
#include <stdexcept>
#include <string>
#include <string_view>
#include <unordered_map>
#include <vector>
 
namespace Opm {
 
template <class TypeTag>
class FlowProblemBlackoil : public FlowProblem<TypeTag>
{
    // TODO: the naming of the Types might be able to be adjusted
public:
    using FlowProblemType = FlowProblem<TypeTag>;
 
private:
    using typename FlowProblemType::Scalar;
    using typename FlowProblemType::Simulator;
    using typename FlowProblemType::GridView;
    using typename FlowProblemType::FluidSystem;
    using typename FlowProblemType::Vanguard;
    using typename FlowProblemType::GlobalEqVector;
    using typename FlowProblemType::EqVector;
    using FlowProblemType::dim;
    using FlowProblemType::dimWorld;
    using FlowProblemType::numEq;
    using FlowProblemType::numPhases;
    using FlowProblemType::numComponents;
 
    // TODO: potentially some cleaning up depending on the usage later here
    using FlowProblemType::enableBioeffects;
    using FlowProblemType::enableBrine;
    using FlowProblemType::enableConvectiveMixing;
    using FlowProblemType::enableDiffusion;
    using FlowProblemType::enableDispersion;
    using FlowProblemType::energyModuleType;
    using FlowProblemType::enableExperiments;
    using FlowProblemType::enableExtbo;
    using FlowProblemType::enableFoam;
    using FlowProblemType::enableMICP;
    using FlowProblemType::enablePolymer;
    using FlowProblemType::enablePolymerMolarWeight;
    using FlowProblemType::enableSaltPrecipitation;
    using FlowProblemType::enableSolvent;
    using FlowProblemType::enableThermalFluxBoundaries;
 
    using FlowProblemType::gasPhaseIdx;
    using FlowProblemType::oilPhaseIdx;
    using FlowProblemType::waterPhaseIdx;
 
    using FlowProblemType::waterCompIdx;
    using FlowProblemType::oilCompIdx;
    using FlowProblemType::gasCompIdx;
 
    using BoundaryRateVector = GetPropType<TypeTag, Properties::BoundaryRateVector>;
    using typename FlowProblemType::RateVector;
    using typename FlowProblemType::PrimaryVariables;
    using typename FlowProblemType::Indices;
    using typename FlowProblemType::IntensiveQuantities;
    using typename FlowProblemType::ElementContext;
 
    using typename FlowProblemType::MaterialLaw;
    using typename FlowProblemType::DimMatrix;
 
    static constexpr bool enableDissolvedGas =
        Indices::compositionSwitchIdx != std::numeric_limits<unsigned>::max();
    enum { enableVapwat = getPropValue<TypeTag, Properties::EnableVapwat>() };
    enum { enableDisgasInWater = getPropValue<TypeTag, Properties::EnableDisgasInWater>() };
    enum { enableGeochemistry = getPropValue<TypeTag, Properties::EnableGeochemistry>() };
    enum { enableMech = getPropValue<TypeTag, Properties::EnableMech>() };
 
    using BioeffectsModule = BlackOilBioeffectsModule<TypeTag, enableBioeffects>;
    using BrineModule = BlackOilBrineModule<TypeTag, enableBrine>;
    using ConvectiveMixingModule = BlackOilConvectiveMixingModule<TypeTag, enableConvectiveMixing>;
    using DiffusionModule = BlackOilDiffusionModule<TypeTag, enableDiffusion>;
    using DispersionModule = BlackOilDispersionModule<TypeTag, enableDispersion>;
    using ExtboModule = BlackOilExtboModule<TypeTag, enableExtbo>;
    using FoamModule = BlackOilFoamModule<TypeTag, enableFoam>;
    using PolymerModule = BlackOilPolymerModule<TypeTag, enablePolymer>;
    using SolventModule = BlackOilSolventModule<TypeTag, enableSolvent>;
 
    using EclWriterType = EclWriter<TypeTag, OutputBlackOilModule<TypeTag> >;
    using IndexTraits = typename FluidSystem::IndexTraitsType;
    using InitialFluidState = typename EquilInitializer<TypeTag>::ScalarFluidState;
    using HybridNewton = BlackOilHybridNewton<TypeTag>;
 
#if HAVE_DAMARIS
    using DamarisWriterType = DamarisWriter<TypeTag>;
#endif
 
public:
    using FlowProblemType::porosity;
    using FlowProblemType::pvtRegionIndex;
 
    static void registerParameters()
    {
        FlowProblemType::registerParameters();
 
        EclWriterType::registerParameters();
#if HAVE_DAMARIS
        DamarisWriterType::registerParameters();
#endif
        VtkTracerModule<TypeTag>::registerParameters();
    }
 
    explicit FlowProblemBlackoil(Simulator& simulator)
        : FlowProblemType(simulator)
        , mixControls_(simulator.vanguard().schedule())
        , prev_timestep_state_(simulator.vanguard().schedule())
        , actionHandler_(simulator.vanguard().eclState(),
                         simulator.vanguard().schedule(),
                         simulator.vanguard().actionState(),
                         simulator.vanguard().summaryState(),
                         this->wellModel_,
                         simulator.vanguard().grid().comm())
        , hybridNewton_(simulator)
    {
        this->model().addOutputModule(std::make_unique<VtkTracerModule<TypeTag>>(simulator));
 
        // Tell the black-oil extensions to initialize their internal data structures
        const auto& vanguard = simulator.vanguard();
 
        if constexpr (enableBrine) {
            BlackOilBrineParams<Scalar> brineParams;
            brineParams.template initFromState<enableBrine,
                                               enableSaltPrecipitation>(vanguard.eclState());
            BrineModule::setParams(std::move(brineParams));
        }
 
        if constexpr (enableDiffusion) {
            DiffusionModule::initFromState(vanguard.eclState());
        }
 
        if constexpr (enableDispersion) {
            DispersionModule::initFromState(vanguard.eclState());
        }
 
        if constexpr (enableExtbo) {
            BlackOilExtboParams<Scalar> extboParams;
            extboParams.template initFromState<enableExtbo>(vanguard.eclState());
            ExtboModule::setParams(std::move(extboParams));
        }
 
        if constexpr (enableFoam) {
            BlackOilFoamParams<Scalar> foamParams;
            foamParams.template initFromState<enableFoam>(vanguard.eclState());
            FoamModule::setParams(std::move(foamParams));
        }
 
        if constexpr (enableBioeffects) {
            BlackOilBioeffectsParams<Scalar> bioeffectsParams;
            bioeffectsParams.template initFromState<enableBioeffects, enableMICP>(vanguard.eclState());
            BioeffectsModule::setParams(std::move(bioeffectsParams));
        }
 
        if constexpr (enablePolymer) {
            BlackOilPolymerParams<Scalar> polymerParams;
            polymerParams.template initFromState<enablePolymer, enablePolymerMolarWeight>(vanguard.eclState());
            PolymerModule::setParams(std::move(polymerParams));
        }
 
        if constexpr (enableSolvent) {
            BlackOilSolventParams<Scalar> solventParams;
            solventParams.template initFromState<enableSolvent>(vanguard.eclState(), vanguard.schedule());
            SolventModule::setParams(std::move(solventParams));
        }
 
        // create the ECL writer
        eclWriter_ = std::make_unique<EclWriterType>(simulator);
        enableEclOutput_ = Parameters::Get<Parameters::EnableEclOutput>();
 
        // Safeguard against geochemistry since it exsist in a separate module with a separate problem class
        if constexpr (!enableGeochemistry) {
            if (vanguard.eclState().runspec().geochem().enabled()) {
                throw std::runtime_error("GEOCHEM keyword in the deck but geochemistry module "
                                         "was disabled at compile time!");
            }
        }
 
        // Safeguard against TPSA-geomechanics since it requires FlowProblemTPSA
        if constexpr (!enableMech) {
            const auto& rspec = vanguard.eclState().runspec();
            if (rspec.mech() && rspec.mechSolver().tpsa()) {
                throw std::runtime_error("TPSA solver enabled in the deck, but geomechanics "
                                         "module was disabled at compile time!");
            }
        }
 
#if HAVE_DAMARIS
        // create Damaris writer
        damarisWriter_ = std::make_unique<DamarisWriterType>(simulator);
        enableDamarisOutput_ = Parameters::Get<Parameters::EnableDamarisOutput>();
#endif
    }
 
    void beginEpisode() override
    {
        FlowProblemType::beginEpisode();
 
        auto& simulator = this->simulator();
 
        const int episodeIdx = simulator.episodeIndex();
        const auto& schedule = simulator.vanguard().schedule();
 
        // Evaluate UDQ assign statements to make sure the settings are
        // available as UDA controls for the current report step.
        this->actionHandler_
            .evalUDQAssignments(episodeIdx, simulator.vanguard().udqState());
 
        if (episodeIdx >= 0) {
            const auto& oilVap = schedule[episodeIdx].oilvap();
            if (oilVap.getType() == OilVaporizationProperties::OilVaporization::VAPPARS) {
                FluidSystem::setVapPars(oilVap.vap1(), oilVap.vap2());
            }
            else {
                FluidSystem::setVapPars(0.0, 0.0);
            }
 
            if constexpr (enableConvectiveMixing) {
                ConvectiveMixingModule::beginEpisode(simulator.vanguard().eclState(), schedule, episodeIdx,
                                                     this->moduleParams_.convectiveMixingModuleParam);
            }
        }
    }
 
    void beginTimeStep() override
    {
        FlowProblemType::beginTimeStep();
        hybridNewton_.tryApplyHybridNewton();
    }
 
    void finishInit()
    {
        FlowProblemType::finishInit();
 
        auto& simulator = this->simulator();
        const bool transmissibilitiesFinished =
            this->prepareTransmissibilityOutput_(*eclWriter_, enableEclOutput_);
 
        const auto& eclState = simulator.vanguard().eclState();
        const auto& schedule = simulator.vanguard().schedule();
        this->initializeSimulatorTime_();
 
        // conserve inner energy instead of enthalpy if TEMP is used
        // or THERMAL and parameter ConserveInnerEnergyThermal is true (default false)
        bool isThermal = eclState.getSimulationConfig().isThermal();
        bool isTemp = eclState.getSimulationConfig().isTemp();
        bool conserveInnerEnergy = isTemp || (isThermal && Parameters::Get<Parameters::ConserveInnerEnergyThermal>());
        FluidSystem::setEnergyEqualEnthalpy(conserveInnerEnergy);
 
        this->initializeModelProperties_();
 
        // write the static output files (EGRID, INIT)
        if (enableEclOutput_) {
            this->eclWriter_->writeInit();
        }
 
        if (!transmissibilitiesFinished) {
            this->finishTransmissibilities_();
        }
 
        const auto& initconfig = eclState.getInitConfig();
        this->tracerModel_.init(initconfig.restartRequested());
        if (initconfig.restartRequested()) {
            this->readEclRestartSolution_();
        }
        else {
            this->readInitialCondition_();
        }
        this->temperatureModel_.init();
        this->tracerModel_.prepareTracerBatches();
 
        this->updatePffDofData_();
 
        if constexpr (getPropValue<TypeTag, Properties::EnablePolymer>()) {
            const auto& vanguard = this->simulator().vanguard();
            const auto& gridView = vanguard.gridView();
            const int numElements = gridView.size(/*codim=*/0);
            this->polymer_.maxAdsorption.resize(numElements, 0.0);
        }
 
        this->readBoundaryConditions_();
 
        // compute and set eq weights based on initial b values
        this->computeAndSetEqWeights_();
 
        if (this->enableDriftCompensation_ || this->enableDriftCompensationTemp_) {
            this->drift_.resize(this->model().numGridDof());
            this->drift_ = 0.0;
        }
 
        // after finishing the initialization and writing the initial solution, we move
        // to the first "real" episode/report step
        // for restart the episode index and start is already set
        if (!initconfig.restartRequested() && !eclState.getIOConfig().initOnly()) {
            simulator.startNextEpisode(schedule.seconds(1));
            simulator.setEpisodeIndex(0);
            simulator.setTimeStepIndex(0);
        }
 
        if (Parameters::Get<Parameters::CheckSatfuncConsistency>() &&
            ! this->satfuncConsistencyRequirementsMet())
        {
            // User requested that saturation functions be checked for
            // consistency and essential/critical requirements are not met.
            // Abort simulation run.
            //
            // Note: We need synchronisation here lest ranks other than the
            // I/O rank throw exceptions too early thereby risking an
            // incomplete failure report being shown to the user.
            this->simulator().vanguard().grid().comm().barrier();
 
            throw std::domain_error {
                "Saturation function end-points do not "
                "meet requisite consistency conditions"
            };
        }
 
        // Checked once the initial solution has been applied.
        this->checkAquiferEquilibration_ = !initconfig.restartRequested() && initconfig.hasEquil();
 
        // TODO: move to the end for later refactoring of the function finishInit()
        //
        // deal with DRSDT
        this->mixControls_.init(this->model().numGridDof(),
                                this->episodeIndex(),
                                eclState.runspec().tabdims().getNumPVTTables());
 
        // Seed the DRSDT/DRVDT history from the initial composition.  Left at
        // zero, the limiter caps Rs at DRSDT * dt on the first step and boils
        // the dissolved gas out of an undersaturated reservoir.  A restarted
        // run seeds it from the restart solution instead.
        if (!initconfig.restartRequested()) {
            for (std::size_t elemIdx = 0; elemIdx < this->initialFluidStates_.size(); ++elemIdx) {
                const auto& fs = this->initialFluidStates_[elemIdx];
                this->mixControls_.updateLastValues(elemIdx, fs.Rs(), fs.Rv());
            }
        }
 
        if (this->enableVtkOutput_() && eclState.getIOConfig().initOnly()) {
            simulator.setTimeStepSize(0.0);
            simulator.model().applyInitialSolution();
            FlowProblemType::writeOutput(true);
        }
 
        if (!eclState.getIOConfig().initOnly()) {
            if (!this->enableTuning_ && eclState.getSimulationConfig().anyTUNING()) {
                OpmLog::info("\nThe deck has TUNING in the SCHEDULE section, but "
                             "it is ignored due\nto the flag --enable-tuning=false. "
                             "Set this flag to true to activate it.\n"
                             "Manually tuning the simulator with the TUNING keyword may "
                             "increase run time.\nIt is recommended using the simulator's "
                             "default tuning (--enable-tuning=false).");
            }
        }
    }
 
    void endTimeStep() override
    {
        FlowProblemType::endTimeStep();
        this->endStepApplyAction();
    }
 
    void endStepApplyAction()
    {
        // After the solution is updated, the values in output module needs
        // also updated.
        this->eclWriter().mutableOutputModule().invalidateLocalData();
 
        // For CpGrid with LGRs, ecl/vtk output is not supported yet.
        const auto& grid = this->simulator().vanguard().gridView().grid();
 
        using GridType = std::remove_cv_t<std::remove_reference_t<decltype(grid)>>;
        constexpr bool isCpGrid = std::is_same_v<GridType, Dune::CpGrid>;
        if (!isCpGrid || (grid.maxLevel() == 0)) {
            this->eclWriter_->evalSummaryState(!this->episodeWillBeOver());
        }
 
        {
            OPM_TIMEBLOCK(applyActions);
 
            const int episodeIdx = this->episodeIndex();
            auto& simulator = this->simulator();
 
            // Clear out any existing events as these have already been
            // processed when we're running an action block
            this->simulator().vanguard().schedule().clearEvents(episodeIdx);
 
            // Re-ordering in case of Alugrid
            this->actionHandler_
                .applyActions(episodeIdx, simulator.time() + simulator.timeStepSize(),
                              [this](const bool global)
            {
                using TransUpdateQuantities = typename
                    Vanguard::TransmissibilityType::TransUpdateQuantities;
 
                this->transmissibilities_
                    .update(global, TransUpdateQuantities::All,
                            [&vg = this->simulator().vanguard()]
                            (const unsigned int i)
                    {
                        return vg.gridIdxToEquilGridIdx(i);
                    });
            });
        }
    }
 
    void endEpisode() override
    {
        OPM_TIMEBLOCK(endEpisode);
 
        // Rerun UDQ assignents following action processing on the final
        // time step of this episode to make sure that any UDQ ASSIGN
        // operations triggered in action blocks take effect.  This is
        // mainly to work around a shortcoming of the ScheduleState copy
        // constructor which clears pending UDQ assignments under the
        // assumption that all such assignments have been processed.  If an
        // action block happens to trigger on the final time step of an
        // episode and that action block runs a UDQ assignment, then that
        // assignment would be dropped and the rest of the simulator will
        // never see its effect without this hack.
        this->actionHandler_
            .evalUDQAssignments(this->episodeIndex(), this->simulator().vanguard().udqState());
 
        FlowProblemType::endEpisode();
    }
 
    void writeReports(const SimulatorTimer& timer)
    {
        if (this->enableEclOutput_) {
            this->eclWriter_->writeReports(timer);
        }
    }
 
 
    void writeOutput(const bool verbose) override
    {
        FlowProblemType::writeOutput(verbose);
 
        const auto isSubStep = !this->episodeWillBeOver();
 
        auto localCellData = data::Solution {};
 
#if HAVE_DAMARIS
        // N.B. the Damaris output has to be done before the ECL output as the ECL one
        // does all kinds of std::move() relocation of data
        if (this->enableDamarisOutput_ && (this->damarisWriter_ != nullptr)) {
            this->damarisWriter_->writeOutput(localCellData, isSubStep);
        }
#endif
 
        if (this->enableEclOutput_ && (this->eclWriter_ != nullptr)) {
            this->eclWriter_->writeOutput(std::move(localCellData), isSubStep,
                                          this->simulator().vanguard().schedule()
                                         .exitStatus().has_value());
        }
    }
 
    void finalizeOutput()
    {
        OPM_TIMEBLOCK(finalizeOutput);
        // this will write all pending output to disk
        // to avoid corruption of output files
        eclWriter_.reset();
    }
 
 
    void initialSolutionApplied() override
    {
        FlowProblemType::initialSolutionApplied();
 
        // let the object for threshold pressures initialize itself. this is done only at
        // this point, because determining the threshold pressures may require to access
        // the initial solution.
        this->thresholdPressures_.finishInit();
 
        if (this->checkAquiferEquilibration_) {
            this->checkAquiferEquilibration_ = false;
            this->checkNumericalAquiferEquilibration_();
        }
 
        // For CpGrid with LGRs, ecl-output is not supported yet.
        const auto& grid = this->simulator().vanguard().gridView().grid();
 
        using GridType = std::remove_cv_t<std::remove_reference_t<decltype(grid)>>;
        constexpr bool isCpGrid = std::is_same_v<GridType, Dune::CpGrid>;
        // Skip - for now -  calculate the initial fip values for CpGrid with LGRs.
        if (!isCpGrid || (grid.maxLevel() == 0)) {
            if (this->simulator().episodeIndex() == 0) {
                eclWriter_->writeInitialFIPReport();
            }
        }
    }
 
    void addToSourceDense(RateVector& rate,
                          unsigned globalDofIdx,
                          unsigned timeIdx) const override
    {
        this->aquiferModel_.addToSource(rate, globalDofIdx, timeIdx);
 
        // Add source term from deck
        const auto& source = this->simulator().vanguard().schedule()[this->episodeIndex()].source();
        std::array<int,3> ijk;
        this->simulator().vanguard().cartesianCoordinate(globalDofIdx, ijk);
 
        if (source.hasSource(ijk)) {
            const int pvtRegionIdx = this->pvtRegionIndex(globalDofIdx);
            static std::array<SourceComponent, 3> sc_map = {SourceComponent::WATER, SourceComponent::OIL, SourceComponent::GAS};
            static std::array<int, 3> phidx_map = {FluidSystem::waterPhaseIdx, FluidSystem::oilPhaseIdx, FluidSystem::gasPhaseIdx};
            static std::array<int, 3> cidx_map = {waterCompIdx, oilCompIdx, gasCompIdx};
 
            for (unsigned i = 0; i < phidx_map.size(); ++i) {
                const auto phaseIdx = phidx_map[i];
                const auto sourceComp = sc_map[i];
                const auto compIdx = cidx_map[i];
                if (!FluidSystem::phaseIsActive(phaseIdx)) {
                    continue;
                }
                Scalar mass_rate = source.rate(ijk, sourceComp) / this->model().dofTotalVolume(globalDofIdx);
                if constexpr (getPropValue<TypeTag, Properties::BlackoilConserveSurfaceVolume>()) {
                    mass_rate /= FluidSystem::referenceDensity(phaseIdx, pvtRegionIdx);
                }
                rate[FluidSystem::canonicalToActiveCompIdx(compIdx)] += mass_rate;
            }
 
            if constexpr (enableSolvent) {
                Scalar mass_rate = source.rate(ijk, SourceComponent::SOLVENT) / this->model().dofTotalVolume(globalDofIdx);
                if constexpr (getPropValue<TypeTag, Properties::BlackoilConserveSurfaceVolume>()) {
                    const auto& solventPvt = SolventModule::solventPvt();
                    mass_rate /= solventPvt.referenceDensity(pvtRegionIdx);
                }
                rate[Indices::contiSolventEqIdx] += mass_rate;
            }
            if constexpr (enablePolymer) {
                rate[Indices::polymerConcentrationIdx] += source.rate(ijk, SourceComponent::POLYMER) / this->model().dofTotalVolume(globalDofIdx);
            }
            if constexpr (enableMICP) {
                rate[Indices::microbialConcentrationIdx] += source.rate(ijk, SourceComponent::MICR) / this->model().dofTotalVolume(globalDofIdx);
                rate[Indices::oxygenConcentrationIdx] += source.rate(ijk, SourceComponent::OXYG) / this->model().dofTotalVolume(globalDofIdx);
                rate[Indices::ureaConcentrationIdx] += source.rate(ijk, SourceComponent::UREA) / (this->model().dofTotalVolume(globalDofIdx));
            }
            if constexpr (energyModuleType == EnergyModules::FullyImplicitThermal) {
                for (unsigned i = 0; i < phidx_map.size(); ++i) {
                    const auto phaseIdx = phidx_map[i];
                    if (!FluidSystem::phaseIsActive(phaseIdx)) {
                        continue;
                    }
                    const auto sourceComp = sc_map[i];
                    const auto source_hrate = source.hrate(ijk, sourceComp);
                    if (source_hrate) {
                        rate[Indices::contiEnergyEqIdx] += source_hrate.value() / this->model().dofTotalVolume(globalDofIdx);
                    } else {
                        const auto& intQuants = this->simulator().model().intensiveQuantities(globalDofIdx, /*timeIdx*/ 0);
                        auto fs = intQuants.fluidState();
                        // if temperature is not set, use cell temperature as default
                        const auto source_temp = source.temperature(ijk, sourceComp);
                        if (source_temp) {
                            Scalar temperature = source_temp.value();
                            fs.setTemperature(temperature);
                        }
                        const auto& h = FluidSystem::enthalpy(fs, phaseIdx, pvtRegionIdx);
                        Scalar mass_rate = source.rate(ijk, sourceComp)/ this->model().dofTotalVolume(globalDofIdx);
                        Scalar energy_rate = getValue(h)*mass_rate;
                        rate[Indices::contiEnergyEqIdx] += energy_rate;
                    }
                }
            }
        }
 
        // if requested, compensate systematic mass loss for cells which were "well
        // behaved" in the last time step
        if (this->enableDriftCompensation_) {
            const auto& simulator = this->simulator();
            const auto& model = this->model();
 
            // we use a lower tolerance for the compensation too
            // assure the added drift from the last step does not
            // cause convergence issues on the current step
            Scalar maxCompensation = model.newtonMethod().tolerance()/10;
            Scalar poro = this->porosity(globalDofIdx, timeIdx);
            Scalar dt = simulator.timeStepSize();
            EqVector dofDriftRate = this->drift_[globalDofIdx];
            dofDriftRate /= dt*model.dofTotalVolume(globalDofIdx);
 
            // restrict drift compensation to the CNV tolerance
            for (unsigned eqIdx = 0; eqIdx < numEq; ++ eqIdx) {
                Scalar cnv = std::abs(dofDriftRate[eqIdx])*dt*model.eqWeight(globalDofIdx, eqIdx)/poro;
                if (cnv > maxCompensation) {
                    dofDriftRate[eqIdx] *= maxCompensation/cnv;
                }
            }
 
            for (unsigned eqIdx = 0; eqIdx < numEq; ++ eqIdx)
                rate[eqIdx] -= dofDriftRate[eqIdx];
        }
    }
 
    template <class LhsEval, class Callback>
    LhsEval permFactTransMultiplier(const IntensiveQuantities& intQuants, unsigned elementIdx, Callback& obtain) const
    {
        OPM_TIMEBLOCK_LOCAL(permFactTransMultiplier, Subsystem::PvtProps);
        if constexpr (enableSaltPrecipitation) {
            const auto& fs = intQuants.fluidState();
            unsigned tableIdx = this->simulator().problem().satnumRegionIndex(elementIdx);
            LhsEval porosityFactor = obtain(1. - fs.saltSaturation());
            porosityFactor = min(porosityFactor, 1.0);
            const auto& permfactTable = BrineModule::permfactTable(tableIdx);
            return permfactTable.eval(porosityFactor, /*extrapolation=*/true);
        }
        else if constexpr (enableBioeffects) {
            return obtain(intQuants.permFactor());
        }
        else {
            return 1.0;
        }
    }
 
    // temporary solution to facilitate output of initial state from flow
    const InitialFluidState& initialFluidState(unsigned globalDofIdx) const
    { return initialFluidStates_[globalDofIdx]; }
 
    std::vector<InitialFluidState>& initialFluidStates()
    { return initialFluidStates_; }
 
    const std::vector<InitialFluidState>& initialFluidStates() const
    { return initialFluidStates_; }
 
    const EclipseIO& eclIO() const
    { return eclWriter_->eclIO(); }
 
    void setSubStepReport(const SimulatorReportSingle& report)
    { return eclWriter_->setSubStepReport(report); }
 
    void setSimulationReport(const SimulatorReport& report)
    { return eclWriter_->setSimulationReport(report); }
 
    InitialFluidState boundaryFluidState(unsigned globalDofIdx, const int directionId) const
    {
        OPM_TIMEBLOCK_LOCAL(boundaryFluidState, Subsystem::Assembly);
        const auto& bcstate = this->simulator().vanguard().schedule()[this->episodeIndex()].bcstate;
        if (bcstate.size() > 0) {
            FaceDir::DirEnum dir = FaceDir::FromIntersectionIndex(directionId);
 
            // index == 0: no boundary conditions for this
            // global cell and direction
            if (this->bcindex_(dir)[globalDofIdx] == 0)
                return initialFluidStates_[globalDofIdx];
 
            const auto& bc = bcstate[this->bcindex_(dir)[globalDofIdx]];
            if (bc.bctype == BCType::DIRICHLET )
            {
                InitialFluidState fluidState;
                const int pvtRegionIdx = this->pvtRegionIndex(globalDofIdx);
                fluidState.setPvtRegionIndex(pvtRegionIdx);
 
                switch (bc.component) {
                    case BCComponent::OIL:
                        if (!FluidSystem::phaseIsActive(FluidSystem::oilPhaseIdx))
                            throw std::logic_error("oil is not active and you're trying to add oil BC");
 
                        fluidState.setSaturation(FluidSystem::oilPhaseIdx, 1.0);
                        break;
                    case BCComponent::GAS:
                        if (!FluidSystem::phaseIsActive(FluidSystem::gasPhaseIdx))
                            throw std::logic_error("gas is not active and you're trying to add gas BC");
 
                        fluidState.setSaturation(FluidSystem::gasPhaseIdx, 1.0);
                        break;
                    case BCComponent::WATER:
                        if (!FluidSystem::phaseIsActive(FluidSystem::waterPhaseIdx))
                            throw std::logic_error("water is not active and you're trying to add water BC");
 
                        fluidState.setSaturation(FluidSystem::waterPhaseIdx, 1.0);
                        break;
                    case BCComponent::SOLVENT:
                    case BCComponent::POLYMER:
                    case BCComponent::MICR:
                    case BCComponent::OXYG:
                    case BCComponent::UREA:
                    case BCComponent::NONE:
                        throw std::logic_error("you need to specify a valid component (OIL, WATER or GAS) when DIRICHLET type is set in BC");
                }
                fluidState.setTotalSaturation(1.0);
                double pressure = initialFluidStates_[globalDofIdx].pressure(this->refPressurePhaseIdx_());
                const auto pressure_input = bc.pressure;
                if (pressure_input) {
                    pressure = *pressure_input;
                }
 
                std::array<Scalar, numPhases> pc = {0};
                const auto& matParams = this->materialLawParams(globalDofIdx);
                MaterialLaw::capillaryPressures(pc, matParams, fluidState);
                Valgrind::CheckDefined(pressure);
                Valgrind::CheckDefined(pc);
                for (unsigned activePhaseIdx = 0; activePhaseIdx < FluidSystem::numActivePhases(); ++activePhaseIdx) {
                    const auto phaseIdx = FluidSystem::activeToCanonicalPhaseIdx(activePhaseIdx);
                    if (Indices::oilEnabled)
                        fluidState.setPressure(phaseIdx, pressure + (pc[phaseIdx] - pc[oilPhaseIdx]));
                    else if (Indices::gasEnabled)
                        fluidState.setPressure(phaseIdx, pressure + (pc[phaseIdx] - pc[gasPhaseIdx]));
                    else if (Indices::waterEnabled)
                        //single (water) phase
                        fluidState.setPressure(phaseIdx, pressure);
                }
                if constexpr (energyModuleType != EnergyModules::NoTemperature) {
                    double temperature = initialFluidStates_[globalDofIdx].temperature(0); // we only have one temperature
                    const auto temperature_input = bc.temperature;
                    if(temperature_input)
                        temperature = *temperature_input;
                    fluidState.setTemperature(temperature);
                }
 
                if constexpr (enableDissolvedGas) {
                    if (FluidSystem::enableDissolvedGas()) {
                        fluidState.setRs(0.0);
                        fluidState.setRv(0.0);
                    }
                }
                if constexpr (enableDisgasInWater) {
                    if (FluidSystem::enableDissolvedGasInWater()) {
                        fluidState.setRsw(0.0);
                    }
                }
                if constexpr (enableVapwat) {
                    if (FluidSystem::enableVaporizedWater()) {
                        fluidState.setRvw(0.0);
                    }
                }
 
                for (unsigned activePhaseIdx = 0; activePhaseIdx < FluidSystem::numActivePhases(); ++activePhaseIdx) {
                    const auto phaseIdx = FluidSystem::activeToCanonicalPhaseIdx(activePhaseIdx);
 
                    const auto& b = FluidSystem::inverseFormationVolumeFactor(fluidState, phaseIdx, pvtRegionIdx);
                    fluidState.setInvB(phaseIdx, b);
 
                    const auto& rho = FluidSystem::density(fluidState, phaseIdx, pvtRegionIdx);
                    fluidState.setDensity(phaseIdx, rho);
                    if constexpr (energyModuleType == EnergyModules::FullyImplicitThermal) {
                        const auto& h = FluidSystem::enthalpy(fluidState, phaseIdx, pvtRegionIdx);
                        fluidState.setEnthalpy(phaseIdx, h);
                    }
                }
                fluidState.checkDefined();
                return fluidState;
            }
        }
        return initialFluidStates_[globalDofIdx];
    }
 
 
    const EclWriterType& eclWriter() const
    { return *eclWriter_; }
 
    EclWriterType& eclWriter()
    { return *eclWriter_; }
 
    Scalar maxGasDissolutionFactor(unsigned timeIdx, unsigned globalDofIdx) const
    {
        return this->mixControls_.maxGasDissolutionFactor(timeIdx, globalDofIdx,
                                                          this->episodeIndex(),
                                                          this->pvtRegionIndex(globalDofIdx));
    }
 
    Scalar maxOilVaporizationFactor(unsigned timeIdx, unsigned globalDofIdx) const
    {
        return this->mixControls_.maxOilVaporizationFactor(timeIdx, globalDofIdx,
                                                           this->episodeIndex(),
                                                           this->pvtRegionIndex(globalDofIdx));
    }
 
    bool recycleFirstIterationStorage() const
    {
        const auto& rspec = this->simulator().vanguard().eclState().runspec();
        const bool tpsaActive = rspec.mech() && rspec.mechSolver().tpsa();
        if (tpsaActive) {
            return false;
        }
 
        int episodeIdx = this->episodeIndex();
        return !this->mixControls_.drsdtActive(episodeIdx) &&
               !this->mixControls_.drvdtActive(episodeIdx) &&
               this->rockCompPoroMultWc_.empty() &&
               this->rockCompPoroMult_.empty();
    }
 
    template <class Context>
    void initial(PrimaryVariables& values, const Context& context, unsigned spaceIdx, unsigned timeIdx) const
    {
        unsigned globalDofIdx = context.globalSpaceIndex(spaceIdx, timeIdx);
 
        values.setPvtRegionIndex(pvtRegionIndex(context, spaceIdx, timeIdx));
        values.assignNaive(initialFluidStates_[globalDofIdx]);
 
        if constexpr (enableSolvent) {
            SolventModule::assignPrimaryVars(values,
                                             this->solventSaturation_[globalDofIdx],
                                             this->solventRsw_[globalDofIdx]);
        }
 
        if constexpr (enablePolymer) {
            values[Indices::polymerConcentrationIdx] = this->polymer_.concentration[globalDofIdx];
        }
 
        if constexpr (enablePolymerMolarWeight) {
            values[Indices::polymerMoleWeightIdx]= this->polymer_.moleWeight[globalDofIdx];
        }
 
        if constexpr (enableBrine) {
            if (enableSaltPrecipitation && values.primaryVarsMeaningBrine() == PrimaryVariables::BrineMeaning::Sp) {
                values[Indices::saltConcentrationIdx] = initialFluidStates_[globalDofIdx].saltSaturation();
            }
            else {
                values[Indices::saltConcentrationIdx] = initialFluidStates_[globalDofIdx].saltConcentration();
            }
        }
 
        if constexpr (enableBioeffects) {
            values[Indices::microbialConcentrationIdx] = this->bioeffects_.microbialConcentration[globalDofIdx];
            values[Indices::biofilmVolumeFractionIdx] = this->bioeffects_.biofilmVolumeFraction[globalDofIdx];
            if constexpr (enableMICP) {
                values[Indices::oxygenConcentrationIdx] = this->bioeffects_.oxygenConcentration[globalDofIdx];
                values[Indices::ureaConcentrationIdx] = this->bioeffects_.ureaConcentration[globalDofIdx];
                values[Indices::calciteVolumeFractionIdx] = this->bioeffects_.calciteVolumeFraction[globalDofIdx];
            }
        }
 
        values.checkDefined();
    }
 
 
    Scalar drsdtcon(unsigned elemIdx, int episodeIdx) const
    {
        return this->mixControls_.drsdtcon(elemIdx, episodeIdx,
                                           this->pvtRegionIndex(elemIdx));
    }
 
    bool drsdtconIsActive(unsigned elemIdx, int episodeIdx) const
    {
        return this->mixControls_.drsdtConvective(episodeIdx, this->pvtRegionIndex(elemIdx));
    }
 
    template <class Context>
    void boundary(BoundaryRateVector& values,
                  const Context& context,
                  unsigned spaceIdx,
                  unsigned timeIdx) const
    {
        OPM_TIMEBLOCK_LOCAL(eclProblemBoundary, Subsystem::Assembly);
        if (!context.intersection(spaceIdx).boundary())
            return;
 
        if constexpr (energyModuleType != EnergyModules::FullyImplicitThermal || !enableThermalFluxBoundaries)
            values.setNoFlow();
        else {
            // in the energy case we need to specify a non-trivial boundary condition
            // because the geothermal gradient needs to be maintained. for this, we
            // simply assume the initial temperature at the boundary and specify the
            // thermal flow accordingly. in this context, "thermal flow" means energy
            // flow due to a temerature gradient while assuming no-flow for mass
            unsigned interiorDofIdx = context.interiorScvIndex(spaceIdx, timeIdx);
            unsigned globalDofIdx = context.globalSpaceIndex(interiorDofIdx, timeIdx);
            values.setThermalFlow(context, spaceIdx, timeIdx, this->initialFluidStates_[globalDofIdx] );
        }
 
        if (this->nonTrivialBoundaryConditions()) {
            unsigned indexInInside  = context.intersection(spaceIdx).indexInInside();
            unsigned interiorDofIdx = context.interiorScvIndex(spaceIdx, timeIdx);
            unsigned globalDofIdx = context.globalSpaceIndex(interiorDofIdx, timeIdx);
            unsigned pvtRegionIdx = pvtRegionIndex(context, spaceIdx, timeIdx);
            const auto [type, massrate] = this->boundaryCondition(globalDofIdx, indexInInside);
            if (type == BCType::THERMAL)
                values.setThermalFlow(context, spaceIdx, timeIdx, this->boundaryFluidState(globalDofIdx, indexInInside));
            else if (type == BCType::FREE || type == BCType::DIRICHLET)
                values.setFreeFlow(context, spaceIdx, timeIdx, this->boundaryFluidState(globalDofIdx, indexInInside));
            else if (type == BCType::RATE)
                values.setMassRate(massrate, pvtRegionIdx);
        }
    }
 
    void readSolutionFromOutputModule(const int restart_step, bool fip_init)
    {
        auto& simulator = this->simulator();
        const auto& eclState = simulator.vanguard().eclState();
 
        std::size_t numElems = this->model().numGridDof();
        this->initialFluidStates_.resize(numElems);
        if constexpr (enableSolvent) {
            this->solventSaturation_.resize(numElems, 0.0);
            this->solventRsw_.resize(numElems, 0.0);
        }
 
        if constexpr (enablePolymer)
            this->polymer_.concentration.resize(numElems, 0.0);
 
        if constexpr (enablePolymerMolarWeight) {
            const std::string msg {"Support of the RESTART for polymer molecular weight "
                                   "is not implemented yet. The polymer weight value will be "
                                   "zero when RESTART begins"};
            OpmLog::warning("NO_POLYMW_RESTART", msg);
            this->polymer_.moleWeight.resize(numElems, 0.0);
        }
 
        if constexpr (enableBioeffects) {
            this->bioeffects_.resize(numElems);
        }
 
        // Initialize mixing controls before trying to set any lastRx valuesx
        this->mixControls_.init(numElems, restart_step, eclState.runspec().tabdims().getNumPVTTables());
 
        if constexpr (enableBioeffects) {
            this->bioeffects_ = this->eclWriter_->outputModule().getBioeffects().getSolution();
        }
 
        for (std::size_t elemIdx = 0; elemIdx < numElems; ++elemIdx) {
            auto& elemFluidState = this->initialFluidStates_[elemIdx];
            elemFluidState.setPvtRegionIndex(pvtRegionIndex(elemIdx));
            this->eclWriter_->outputModule().initHysteresisParams(simulator, elemIdx);
            this->eclWriter_->outputModule().assignToFluidState(elemFluidState, elemIdx);
 
            // Note: Function processRestartSaturations_() mutates the
            // 'ssol' argument--the value from the restart file--if solvent
            // is enabled.  Then, store the updated solvent saturation into
            // 'solventSaturation_'.  Otherwise, just pass a dummy value to
            // the function and discard the unchanged result.  Do not index
            // into 'solventSaturation_' unless solvent is enabled.
            {
                auto ssol = enableSolvent
                            ? this->eclWriter_->outputModule().getSolventSaturation(elemIdx)
                            : Scalar(0);
 
                this->processRestartSaturations_(elemFluidState, ssol);
 
                if constexpr (enableSolvent) {
                    this->solventSaturation_[elemIdx] = ssol;
                    this->solventRsw_[elemIdx] = this->eclWriter_->outputModule().getSolventRsw(elemIdx);
                }
            }
 
            // For CO2STORE, H2STORE, CO2SOL and H2SOL we need to set the initial temperature
            // for isothermal simulations
            if constexpr (energyModuleType != EnergyModules::NoTemperature) {
                const auto& rspec = eclState.runspec();
                bool needTemperature = rspec.co2Storage() || rspec.h2Storage()
                    || rspec.co2Sol() || rspec.h2Sol();
                if (needTemperature) {
                    const auto& fp = simulator.vanguard().eclState().fieldProps();
                    elemFluidState.setTemperature(fp.get_double("TEMPI")[elemIdx]);
                }
            }
 
            this->mixControls_.updateLastValues(elemIdx, elemFluidState.Rs(), elemFluidState.Rv());
 
            if constexpr (enablePolymer)
                this->polymer_.concentration[elemIdx] = this->eclWriter_->outputModule().getPolymerConcentration(elemIdx);
            // if we need to restart for polymer molecular weight simulation, we need to add related here
        }
 
        const int episodeIdx = this->episodeIndex();
        this->mixControls_.updateMaxValues(episodeIdx, simulator.timeStepSize());
 
        // assign the restart solution to the current solution. note that we still need
        // to compute real initial solution after this because the initial fluid states
        // need to be correct for stuff like boundary conditions.
        auto& sol = this->model().solution(/*timeIdx=*/0);
        const auto& gridView = this->gridView();
        ElementContext elemCtx(simulator);
        for (const auto& elem : elements(gridView, Dune::Partitions::interior)) {
            elemCtx.updatePrimaryStencil(elem);
            int elemIdx = elemCtx.globalSpaceIndex(/*spaceIdx=*/0, /*timeIdx=*/0);
            this->initial(sol[elemIdx], elemCtx, /*spaceIdx=*/0, /*timeIdx=*/0);
        }
 
        // make sure that the ghost and overlap entities exhibit the correct
        // solution. alternatively, this could be done in the loop above by also
        // considering non-interior elements. Since the initial() method might not work
        // 100% correctly for such elements, let's play safe and explicitly synchronize
        // using message passing.
        this->model().syncOverlap();
 
        if (fip_init) {
            this->updateReferencePorosity_();
            this->mixControls_.init(this->model().numGridDof(),
                                    this->episodeIndex(),
                                    eclState.runspec().tabdims().getNumPVTTables());
        }
    }
 
    template<class Serializer>
    void serializeOp(Serializer& serializer)
    {
        serializer(static_cast<FlowProblemType&>(*this));
        serializer(mixControls_);
        serializer(*eclWriter_);
    }
 
protected:
    void captureBeginTimeStepState_() override
    {
        FlowProblemType::captureBeginTimeStepState_();
        prev_timestep_state_.mixControls = mixControls_;
    }
 
    void restoreBeginTimeStepState_() override
    {
        FlowProblemType::restoreBeginTimeStepState_();
        mixControls_ = prev_timestep_state_.mixControls;
    }
 
    void updateExplicitQuantities_(int episodeIdx, int timeStepSize, const bool first_step_after_restart) override
    {
        this->updateExplicitQuantities_(first_step_after_restart);
 
        if constexpr (getPropValue<TypeTag, Properties::EnablePolymer>())
            updateMaxPolymerAdsorption_();
 
        mixControls_.updateExplicitQuantities(episodeIdx, timeStepSize);
    }
 
    void updateMaxPolymerAdsorption_()
    {
        // we need to update the max polymer adsoption data for all elements
        this->updateProperty_("FlowProblemBlackoil::updateMaxPolymerAdsorption_() failed:",
                              [this](unsigned compressedDofIdx, const IntensiveQuantities& iq)
                              {
                                  this->updateMaxPolymerAdsorption_(compressedDofIdx,iq);
                              });
    }
 
    bool updateMaxPolymerAdsorption_(unsigned compressedDofIdx, const IntensiveQuantities& iq)
    {
        const Scalar pa = scalarValue(iq.polymerAdsorption());
        auto& mpa = this->polymer_.maxAdsorption;
        if (mpa[compressedDofIdx] < pa) {
            mpa[compressedDofIdx] = pa;
            return true;
        } else {
            return false;
        }
    }
 
    void computeAndSetEqWeights_()
    {
        std::vector<Scalar> sumInvB(numPhases, 0.0);
        const auto& gridView = this->gridView();
        ElementContext elemCtx(this->simulator());
        for(const auto& elem: elements(gridView, Dune::Partitions::interior)) {
            elemCtx.updatePrimaryStencil(elem);
            int elemIdx = elemCtx.globalSpaceIndex(/*spaceIdx=*/0, /*timeIdx=*/0);
            const auto& dofFluidState = this->initialFluidStates_[elemIdx];
            for (unsigned phaseIdx = 0; phaseIdx < numPhases; ++phaseIdx) {
                if (!FluidSystem::phaseIsActive(phaseIdx))
                    continue;
 
                sumInvB[phaseIdx] += dofFluidState.invB(phaseIdx);
            }
        }
 
        std::size_t numDof = this->model().numGridDof();
        const auto& comm = this->simulator().vanguard().grid().comm();
        comm.sum(sumInvB.data(),sumInvB.size());
        Scalar numTotalDof = comm.sum(numDof);
 
        for (unsigned phaseIdx = 0; phaseIdx < numPhases; ++phaseIdx) {
            if (!FluidSystem::phaseIsActive(phaseIdx))
                continue;
 
            Scalar avgB = numTotalDof / sumInvB[phaseIdx];
            const unsigned solventCompIdx = FluidSystem::solventComponentIndex(phaseIdx);
            const unsigned activeSolventCompIdx = FluidSystem::canonicalToActiveCompIdx(solventCompIdx);
            this->model().setEqWeight(activeSolventCompIdx, avgB);
        }
    }
 
    // update the parameters needed for DRSDT and DRVDT
    bool updateCompositionChangeLimits_()
    {
        OPM_TIMEBLOCK(updateCompositionChangeLimits);
        // update the "last Rs" values for all elements, including the ones in the ghost
        // and overlap regions
        int episodeIdx = this->episodeIndex();
        std::array<bool,3> active{this->mixControls_.drsdtConvective(episodeIdx),
                                  this->mixControls_.drsdtActive(episodeIdx),
                                  this->mixControls_.drvdtActive(episodeIdx)};
        if (!active[0] && !active[1] && !active[2]) {
            return false;
        }
 
        this->updateProperty_("FlowProblemBlackoil::updateCompositionChangeLimits_()) failed:",
                              [this,episodeIdx,active](unsigned compressedDofIdx,
                                                       const IntensiveQuantities& iq)
                              {
                                  const DimMatrix& perm = this->intrinsicPermeability(compressedDofIdx);
                                  const Scalar distZ = active[0] ? this->simulator().vanguard().cellThickness(compressedDofIdx) : 0.0;
                                  const int pvtRegionIdx = this->pvtRegionIndex(compressedDofIdx);
                                  this->mixControls_.update(compressedDofIdx,
                                                            iq,
                                                            episodeIdx,
                                                            this->gravity_[dim - 1],
                                                            perm[dim - 1][dim - 1],
                                                            distZ,
                                                            pvtRegionIdx);
                              }
        );
 
        return true;
    }
 
    void readEclRestartSolution_()
    {
        // Throw an exception if the grid has LGRs. Refined grid are not supported for restart.
        if(this->simulator().vanguard().grid().maxLevel() > 0) {
            throw std::invalid_argument("Refined grids are not yet supported for restart ");
        }
 
        // Set the start time of the simulation
        auto& simulator = this->simulator();
        const auto& schedule = simulator.vanguard().schedule();
        const auto& eclState = simulator.vanguard().eclState();
        const auto& initconfig = eclState.getInitConfig();
        const int restart_step = initconfig.getRestartStep();
        {
            simulator.setTime(schedule.seconds(restart_step));
 
            simulator.startNextEpisode(simulator.startTime() + simulator.time(),
                                       schedule.stepLength(restart_step));
            simulator.setEpisodeIndex(restart_step);
        }
        this->eclWriter_->beginRestart();
 
        Scalar dt = std::min(this->eclWriter_->restartTimeStepSize(), simulator.episodeLength());
        simulator.setTimeStepSize(dt);
 
        this->readSolutionFromOutputModule(restart_step, false);
 
        this->eclWriter_->endRestart();
    }
 
    void readEquilInitialCondition_() override
    {
        const auto& simulator = this->simulator();
 
        // initial condition corresponds to hydrostatic conditions.
        EquilInitializer<TypeTag> equilInitializer(simulator, *(this->materialLawManager_));
 
        std::size_t numElems = this->model().numGridDof();
        this->initialFluidStates_.resize(numElems);
        for (std::size_t elemIdx = 0; elemIdx < numElems; ++elemIdx) {
            auto& elemFluidState = this->initialFluidStates_[elemIdx];
            elemFluidState.assign(equilInitializer.initialFluidState(elemIdx));
        }
    }
 
    void readExplicitInitialCondition_() override
    {
        const auto& simulator = this->simulator();
        const auto& vanguard = simulator.vanguard();
        const auto& eclState = vanguard.eclState();
        const auto& fp = eclState.fieldProps();
        bool has_swat     = fp.has_double("SWAT");
        bool has_sgas     = fp.has_double("SGAS");
        bool has_rs       = fp.has_double("RS");
        bool has_rsw      = fp.has_double("RSW");
        bool has_rv       = fp.has_double("RV");
        bool has_rvw      = fp.has_double("RVW");
        bool has_pressure = fp.has_double("PRESSURE");
        bool has_salt     = fp.has_double("SALT");
        bool has_saltp    = fp.has_double("SALTP");
 
        // make sure all required quantities are enables
        if (Indices::numPhases > 1) {
            if (FluidSystem::phaseIsActive(waterPhaseIdx) && !has_swat)
                throw std::runtime_error("The ECL input file requires the presence of the SWAT keyword if "
                                         "the water phase is active");
            if (FluidSystem::phaseIsActive(gasPhaseIdx) && !has_sgas && FluidSystem::phaseIsActive(oilPhaseIdx))
                throw std::runtime_error("The ECL input file requires the presence of the SGAS keyword if "
                                         "the gas phase is active");
        }
        if (!has_pressure)
            throw std::runtime_error("The ECL input file requires the presence of the PRESSURE "
                                     "keyword if the model is initialized explicitly");
        if (FluidSystem::enableDissolvedGas() && !has_rs)
            throw std::runtime_error("The ECL input file requires the RS keyword to be present if"
                                     " dissolved gas is enabled and the model is initialized explicitly");
        if (FluidSystem::enableDissolvedGasInWater() && !has_rsw)
            OpmLog::warning("The model is initialized explicitly and the RSW keyword is not present in the"
                            " ECL input file. The RSW values are set equal to 0");
        if (FluidSystem::enableVaporizedOil() && !has_rv)
            throw std::runtime_error("The ECL input file requires the RV keyword to be present if"
                                     " vaporized oil is enabled and the model is initialized explicitly");
        if (FluidSystem::enableVaporizedWater() && !has_rvw)
            throw std::runtime_error("The ECL input file requires the RVW keyword to be present if"
                                     " vaporized water is enabled and the model is initialized explicitly");
        if (enableBrine && !has_salt)
            throw std::runtime_error("The ECL input file requires the SALT keyword to be present if"
                                     " brine is enabled and the model is initialized explicitly");
        if (enableSaltPrecipitation && !has_saltp)
            throw std::runtime_error("The ECL input file requires the SALTP keyword to be present if"
                                     " salt precipitation is enabled and the model is initialized explicitly");
 
        std::size_t numDof = this->model().numGridDof();
 
        initialFluidStates_.resize(numDof);
 
        std::vector<double> waterSaturationData;
        std::vector<double> gasSaturationData;
        std::vector<double> pressureData;
        std::vector<double> rsData;
        std::vector<double> rswData;
        std::vector<double> rvData;
        std::vector<double> rvwData;
        std::vector<double> tempiData;
        std::vector<double> saltData;
        std::vector<double> saltpData;
 
        if (FluidSystem::phaseIsActive(waterPhaseIdx) && Indices::numPhases > 1)
            waterSaturationData = fp.get_double("SWAT");
        else
            waterSaturationData.resize(numDof);
 
        if (FluidSystem::phaseIsActive(gasPhaseIdx) && FluidSystem::phaseIsActive(oilPhaseIdx))
            gasSaturationData = fp.get_double("SGAS");
        else
            gasSaturationData.resize(numDof);
 
        pressureData = fp.get_double("PRESSURE");
        if (FluidSystem::enableDissolvedGas())
            rsData = fp.get_double("RS");
 
        if (FluidSystem::enableDissolvedGasInWater() && has_rsw)
            rswData = fp.get_double("RSW");
 
        if (FluidSystem::enableVaporizedOil())
            rvData = fp.get_double("RV");
 
        if (FluidSystem::enableVaporizedWater())
            rvwData = fp.get_double("RVW");
 
        // initial reservoir temperature
        tempiData = fp.get_double("TEMPI");
 
        // initial salt concentration data
        if constexpr (enableBrine)
            saltData = fp.get_double("SALT");
 
        // initial precipitated salt saturation data
        if constexpr (enableSaltPrecipitation)
            saltpData = fp.get_double("SALTP");
 
        // calculate the initial fluid states
        for (std::size_t dofIdx = 0; dofIdx < numDof; ++dofIdx) {
            auto& dofFluidState = initialFluidStates_[dofIdx];
 
            dofFluidState.setPvtRegionIndex(pvtRegionIndex(dofIdx));
 
            // set temperature
            if constexpr (energyModuleType != EnergyModules::NoTemperature) {
                Scalar temperatureLoc = tempiData[dofIdx];
                if (!std::isfinite(temperatureLoc) || temperatureLoc <= 0)
                    temperatureLoc = FluidSystem::surfaceTemperature;
                dofFluidState.setTemperature(temperatureLoc);
            }
 
            // set salt concentration
            if constexpr (enableBrine)
                dofFluidState.setSaltConcentration(saltData[dofIdx]);
 
            // set precipitated salt saturation
            if constexpr (enableSaltPrecipitation)
                dofFluidState.setSaltSaturation(saltpData[dofIdx]);
 
            // set saturations
            if (FluidSystem::phaseIsActive(FluidSystem::waterPhaseIdx))
                dofFluidState.setSaturation(FluidSystem::waterPhaseIdx,
                                            waterSaturationData[dofIdx]);
 
            if (FluidSystem::phaseIsActive(FluidSystem::gasPhaseIdx)){
                if (!FluidSystem::phaseIsActive(FluidSystem::oilPhaseIdx)){
                    dofFluidState.setSaturation(FluidSystem::gasPhaseIdx,
                                                1.0
                                                - waterSaturationData[dofIdx]);
                }
                else
                    dofFluidState.setSaturation(FluidSystem::gasPhaseIdx,
                                                gasSaturationData[dofIdx]);
            }
            if (FluidSystem::phaseIsActive(FluidSystem::oilPhaseIdx)) {
                const Scalar soil = 1.0 - waterSaturationData[dofIdx] - gasSaturationData[dofIdx];
                if (soil < smallSaturationTolerance_) {
                    dofFluidState.setSaturation(FluidSystem::oilPhaseIdx, 0.0);
                }
                else {
                    dofFluidState.setSaturation(FluidSystem::oilPhaseIdx, soil);
                }
            }
 
            // set phase pressures
            Scalar pressure = pressureData[dofIdx]; // oil pressure (or gas pressure for water-gas system or water pressure for single phase)
 
            // this assumes that capillary pressures only depend on the phase saturations
            // and possibly on temperature. (this is always the case for ECL problems.)
            std::array<Scalar, numPhases> pc = {0};
            const auto& matParams = this->materialLawParams(dofIdx);
            MaterialLaw::capillaryPressures(pc, matParams, dofFluidState);
            Valgrind::CheckDefined(pressure);
            Valgrind::CheckDefined(pc);
            for (unsigned phaseIdx = 0; phaseIdx < numPhases; ++phaseIdx) {
                if (!FluidSystem::phaseIsActive(phaseIdx))
                    continue;
 
                if (Indices::oilEnabled)
                    dofFluidState.setPressure(phaseIdx, pressure + (pc[phaseIdx] - pc[oilPhaseIdx]));
                else if (Indices::gasEnabled)
                    dofFluidState.setPressure(phaseIdx, pressure + (pc[phaseIdx] - pc[gasPhaseIdx]));
                else if (Indices::waterEnabled)
                    //single (water) phase
                    dofFluidState.setPressure(phaseIdx, pressure);
            }
 
            if constexpr (enableDissolvedGas) {
                if (FluidSystem::enableDissolvedGas())
                    dofFluidState.setRs(rsData[dofIdx]);
                else if (Indices::gasEnabled && Indices::oilEnabled)
                    dofFluidState.setRs(0.0);
                if (FluidSystem::enableVaporizedOil())
                    dofFluidState.setRv(rvData[dofIdx]);
                else if (Indices::gasEnabled && Indices::oilEnabled)
                    dofFluidState.setRv(0.0);
            }
 
            if constexpr (enableDisgasInWater) {
                if (FluidSystem::enableDissolvedGasInWater() && has_rsw)
                    dofFluidState.setRsw(rswData[dofIdx]);
            }
 
            if constexpr (enableVapwat) {
                if (FluidSystem::enableVaporizedWater())
                    dofFluidState.setRvw(rvwData[dofIdx]);
            }
 
            // set invB_
            for (unsigned phaseIdx = 0; phaseIdx < numPhases; ++phaseIdx) {
                if (!FluidSystem::phaseIsActive(phaseIdx))
                    continue;
 
                const auto& b = FluidSystem::inverseFormationVolumeFactor(dofFluidState, phaseIdx, pvtRegionIndex(dofIdx));
                dofFluidState.setInvB(phaseIdx, b);
 
                const auto& rho = FluidSystem::density(dofFluidState, phaseIdx, pvtRegionIndex(dofIdx));
                dofFluidState.setDensity(phaseIdx, rho);
 
            }
        }
    }
 
 
    void processRestartSaturations_(InitialFluidState& elemFluidState, Scalar& solventSaturation)
    {
        // each phase needs to be above certain value to be claimed to be existing
        // this is used to recover some RESTART running with the defaulted single-precision format
        Scalar sumSaturation = 0.0;
        for (std::size_t phaseIdx = 0; phaseIdx < numPhases; ++phaseIdx) {
            if (FluidSystem::phaseIsActive(phaseIdx)) {
                if (elemFluidState.saturation(phaseIdx) < smallSaturationTolerance_)
                    elemFluidState.setSaturation(phaseIdx, 0.0);
 
                sumSaturation += elemFluidState.saturation(phaseIdx);
            }
 
        }
        if constexpr (enableSolvent) {
            if (solventSaturation < smallSaturationTolerance_)
                solventSaturation = 0.0;
 
            sumSaturation += solventSaturation;
        }
 
        assert(sumSaturation > 0.0);
 
        for (std::size_t phaseIdx = 0; phaseIdx < numPhases; ++phaseIdx) {
            if (FluidSystem::phaseIsActive(phaseIdx)) {
                const Scalar saturation = elemFluidState.saturation(phaseIdx) / sumSaturation;
                elemFluidState.setSaturation(phaseIdx, saturation);
            }
        }
        if constexpr (enableSolvent) {
            solventSaturation = solventSaturation / sumSaturation;
        }
    }
 
    void readInitialCondition_() override
    {
        FlowProblemType::readInitialCondition_();
 
        if constexpr (enableSolvent || enablePolymer || enablePolymerMolarWeight || enableBioeffects)
            this->readBlackoilExtentionsInitialConditions_(this->model().numGridDof(),
                                                           enableSolvent,
                                                           enablePolymer,
                                                           enablePolymerMolarWeight,
                                                           enableBioeffects,
                                                           enableMICP);
 
    }
 
    void handleSolventBC(const BCState::BCFace& bc, RateVector& rate) const override
    {
        if constexpr (!enableSolvent)
            throw std::logic_error("solvent is disabled and you're trying to add solvent to BC");
 
        rate[Indices::solventSaturationIdx] = bc.rate;
    }
 
    void handlePolymerBC(const BCState::BCFace& bc, RateVector& rate) const override
    {
        if constexpr (!enablePolymer)
            throw std::logic_error("polymer is disabled and you're trying to add polymer to BC");
 
        rate[Indices::polymerConcentrationIdx] = bc.rate;
    }
 
    void handleMicrBC(const BCState::BCFace& bc, RateVector& rate) const override
    {
        if constexpr (!enableMICP)
            throw std::logic_error("MICP is disabled and you're trying to add microbes to BC");
 
        rate[Indices::microbialConcentrationIdx] = bc.rate;
    }
 
    void handleOxygBC(const BCState::BCFace& bc, RateVector& rate) const override
    {
        if constexpr (!enableMICP)
            throw std::logic_error("MICP is disabled and you're trying to add oxygen to BC");
 
        rate[Indices::oxygenConcentrationIdx] = bc.rate;
    }
 
    void handleUreaBC(const BCState::BCFace& bc, RateVector& rate) const override
    {
        if constexpr (!enableMICP)
            throw std::logic_error("MICP is disabled and you're trying to add urea to BC");
 
        rate[Indices::ureaConcentrationIdx] = bc.rate;
        // since the urea concentration can be much larger than 1, then we apply a scaling factor
        rate[Indices::ureaConcentrationIdx] *= getPropValue<TypeTag, Properties::BlackOilUreaScalingFactor>();
    }
 
    void updateExplicitQuantities_(const bool first_step_after_restart)
    {
        OPM_TIMEBLOCK(updateExplicitQuantities);
        const bool invalidateFromMaxWaterSat = this->updateMaxWaterSaturation_();
        const bool invalidateFromMinPressure = this->updateMinPressure_();
 
        // update hysteresis and max oil saturation used in vappars
        const bool invalidateFromHyst = this->updateHysteresis_();
        const bool invalidateFromMaxOilSat = this->updateMaxOilSaturation_();
 
        // deal with DRSDT and DRVDT
        const bool invalidateDRDT = !first_step_after_restart && this->updateCompositionChangeLimits_();
 
        // the derivatives may have changed
        const bool invalidateIntensiveQuantities
            = invalidateFromMaxWaterSat || invalidateFromMinPressure || invalidateFromHyst || invalidateFromMaxOilSat || invalidateDRDT;
        if (invalidateIntensiveQuantities) {
            OPM_TIMEBLOCK(beginTimeStepInvalidateIntensiveQuantities);
            this->model().invalidateAndUpdateIntensiveQuantities(/*timeIdx=*/0);
        }
 
        this->updateRockCompTransMultVal_();
    }
 
    // Driving pressure difference, from the aquifer cell to the connected
    // cell, of largest magnitude among the phases which flow across the
    // connection in the initial solution.  The pressure differences,
    // including threshold pressures, and the (directional) upstream
    // mobilities are evaluated as in the flux assembly.  A phase which is
    // absent in the upstream cell is not considered to flow.  Zero if no
    // phase flows.
    Scalar initialFlowPressureDifference_(const unsigned cellIdx,
                                          const unsigned aquIdx,
                                          const FaceDir::DirEnum faceDir) const
    {
        using ExtensiveQuantities = GetPropType<TypeTag, Properties::ExtensiveQuantities>;
        using Evaluation = GetPropType<TypeTag, Properties::Evaluation>;
 
        const auto& model = this->model();
        const auto& iqCell = model.intensiveQuantities(cellIdx, /*timeIdx=*/0);
        const auto& iqAqu = model.intensiveQuantities(aquIdx, /*timeIdx=*/0);
 
        const Scalar distZg = (this->dofCenterDepth(cellIdx) - this->dofCenterDepth(aquIdx))
            * this->gravity_[dim - 1];
        const Scalar thpresCellToAqu = this->thresholdPressure(cellIdx, aquIdx);
        const Scalar thpresAquToCell = this->thresholdPressure(aquIdx, cellIdx);
 
        Scalar largest = 0.0;
        for (unsigned phaseIdx = 0; phaseIdx < numPhases; ++phaseIdx) {
            if (!FluidSystem::phaseIsActive(phaseIdx)) {
                continue;
            }
 
            constexpr unsigned cellLocalIdx = 0;
            constexpr unsigned aquLocalIdx = 1;
            short upIdx = cellLocalIdx;
            short dnIdx = aquLocalIdx;
            Evaluation pressureDifference = 0.0;
            ExtensiveQuantities::calculatePhasePressureDiff_(upIdx, dnIdx, pressureDifference,
                                                             iqCell, iqAqu, phaseIdx,
                                                             cellLocalIdx, aquLocalIdx,
                                                             model.dofTotalVolume(cellIdx),
                                                             model.dofTotalVolume(aquIdx),
                                                             cellIdx, aquIdx, distZg,
                                                             thpresCellToAqu, thpresAquToCell,
                                                             this->moduleParams());
 
            // pressureDifference is positive for flow from the aquifer cell.
            const Scalar dp = getValue(pressureDifference);
            const auto& up = (upIdx == static_cast<short>(cellLocalIdx)) ? iqCell : iqAqu;
            if (dp != 0.0 &&
                getValue(up.fluidState().saturation(phaseIdx)) > 0.0 &&
                getValue(up.mobility(phaseIdx, faceDir)) > 0.0 &&
                std::abs(dp) > std::abs(largest))
            {
                largest = dp;
            }
        }
        return largest;
    }
 
    // Stops the simulation, unless explicitly allowed, if fluid flows
    // initially through numerical aquifers between cells of different
    // equilibration regions.
    void checkNumericalAquiferEquilibration_() const
    {
        const auto& vanguard = this->simulator().vanguard();
        const auto& eclState = vanguard.eclState();
        if (!eclState.aquifer().hasNumericalAquifer() ||
            !eclState.fieldProps().has_int("EQLNUM"))
        {
            return;
        }
 
        std::unordered_map<std::size_t, std::size_t> aquiferOfCell;
        for (const auto& [cartIdx, cell] : eclState.aquifer().numericalAquifers().allAquiferCells()) {
            aquiferOfCell.emplace(cartIdx, cell->aquifer_id);
        }
 
        const auto eqlnum = this->lookUpData_.template
            assignFieldPropsIntOnLeaf<int>(eclState.fieldProps(), "EQLNUM", /*needsTranslation=*/false);
 
        // Each connection to an aquifer cell is visited from the interior
        // cell on the other side, and connections between two aquifer
        // cells from the cell with the lower Cartesian index.
        std::vector<NumericalAquiferEquilibrationMismatch> mismatches;
        const auto& gridView = this->gridView();
        for (const auto& elem : elements(gridView, Dune::Partitions::interior)) {
            const unsigned cellIdx = this->elementMapper().index(elem);
            const auto cellCart = vanguard.cartesianIndex(cellIdx);
            const bool cellIsAquifer = aquiferOfCell.contains(cellCart);
            for (const auto& intersection : intersections(gridView, elem)) {
                if (!intersection.neighbor()) {
                    continue;
                }
                const unsigned aquIdx = this->elementMapper().index(intersection.outside());
                const auto aquCart = vanguard.cartesianIndex(aquIdx);
                const auto aquifer = aquiferOfCell.find(aquCart);
                if (aquifer == aquiferOfCell.end() ||
                    (cellIsAquifer && cellCart > aquCart) ||
                    eqlnum[aquIdx] == eqlnum[cellIdx] ||
                    !(this->transmissibility(cellIdx, aquIdx) > 0.0))
                {
                    continue;
                }
 
                // Same face direction as in the flux assembly (ecfvstencil).
                const int dirId = intersection.indexInInside();
                const auto faceDir = (dirId < 0) ? FaceDir::DirEnum::Unknown
                                                 : FaceDir::FromIntersectionIndex(dirId);
 
                const Scalar dp = this->initialFlowPressureDifference_(cellIdx, aquIdx, faceDir);
                if (std::abs(dp) > numericalAquiferEquilibrationTolerance) {
                    mismatches.push_back({aquifer->second, eqlnum[aquIdx], eqlnum[cellIdx], dp});
                }
            }
        }
 
        checkNumericalAquiferEquilibration(mismatches, eclState, vanguard.grid().comm(),
                                           Parameters::Get<Parameters::AllowInconsistentAquiferEquilibration>());
    }
 
    bool satfuncConsistencyRequirementsMet() const
    {
        if (const auto nph = FluidSystem::phaseIsActive(FluidSystem::oilPhaseIdx)
            + FluidSystem::phaseIsActive(FluidSystem::gasPhaseIdx)
            + FluidSystem::phaseIsActive(FluidSystem::waterPhaseIdx);
            nph < 2)
        {
            // Single phase runs don't need saturation functions and there's
            // nothing to do here.  Return 'true' to tell caller that the
            // consistency requirements are Met.
            return true;
        }
 
        const auto numSamplePoints = static_cast<std::size_t>
            (Parameters::Get<Parameters::NumSatfuncConsistencySamplePoints>());
 
        auto sfuncConsistencyChecks =
            Satfunc::PhaseChecks::SatfuncConsistencyCheckManager<Scalar> {
            numSamplePoints, this->simulator().vanguard().eclState(),
            [&cmap = this->simulator().vanguard().cartesianIndexMapper()](const int elemIdx)
            { return cmap.cartesianIndex(elemIdx); }
        };
 
        const auto ioRank = 0;
        const auto isIoRank = this->simulator().vanguard()
            .grid().comm().rank() == ioRank;
 
        // Note: Run saturation function consistency checks on main grid
        // only (i.e., levelGridView(0)).  These checks are not supported
        // for LGRs at this time.
        sfuncConsistencyChecks.collectFailuresTo(ioRank)
            .run(this->simulator().vanguard().grid().levelGridView(0),
                 [&vg   = this->simulator().vanguard(),
                  &emap = this->simulator().model().elementMapper()]
                 (const auto& elem)
                 { return vg.gridIdxToEquilGridIdx(emap.index(elem)); });
 
        using ViolationLevel = typename Satfunc::PhaseChecks::
            SatfuncConsistencyCheckManager<Scalar>::ViolationLevel;
 
        auto reportFailures = [&sfuncConsistencyChecks]
            (const ViolationLevel level)
        {
            sfuncConsistencyChecks.reportFailures
                (level, [](std::string_view record)
                { OpmLog::info(std::string { record }); });
        };
 
        if (sfuncConsistencyChecks.anyFailedStandardChecks()) {
            if (isIoRank) {
                OpmLog::warning("Saturation Function "
                                "End-point Consistency Problems");
 
                reportFailures(ViolationLevel::Standard);
            }
        }
 
        if (sfuncConsistencyChecks.anyFailedCriticalChecks()) {
            if (isIoRank) {
                OpmLog::error("Saturation Function "
                              "End-point Consistency Failures");
 
                reportFailures(ViolationLevel::Critical);
            }
 
            // There are "critical" check failures.  Report that consistency
            // requirements are not Met.
            return false;
        }
 
        // If we get here then there are no critical failures.  Report
        // Met = true, i.e., that the consistency requirements ARE met.
        return true;
    }
 
    std::vector<InitialFluidState> initialFluidStates_;
 
    bool enableEclOutput_;
    std::unique_ptr<EclWriterType> eclWriter_;
 
    const Scalar smallSaturationTolerance_ = 1.e-6;
#if HAVE_DAMARIS
    bool enableDamarisOutput_ = false ;
    std::unique_ptr<DamarisWriterType> damarisWriter_;
#endif
    MixingRateControls<FluidSystem> mixControls_;
 
    // Whether to check numerical aquifers for initial flow between
    // equilibration regions once the initial solution has been applied.
    bool checkAquiferEquilibration_{false};
 
    struct PrevTimestepState
    {
        explicit PrevTimestepState(const Schedule& schedule)
            : mixControls(schedule)
        {}
 
        MixingRateControls<FluidSystem> mixControls; 
    };
 
    PrevTimestepState prev_timestep_state_;
 
    ActionHandler<Scalar, IndexTraits> actionHandler_;
 
    HybridNewton hybridNewton_;
 
private:
    bool episodeWillBeOver() const override
    {
        const auto currTime = this->simulator().time()
            + this->simulator().timeStepSize();
 
        const auto nextReportStep =
            this->simulator().vanguard().schedule()
            .seconds(this->simulator().episodeIndex() + 1);
 
        const auto isSubStep = (nextReportStep - currTime)
            > (2 * std::numeric_limits<float>::epsilon()) * nextReportStep;
 
        return !isSubStep;
    }
};
 
} // namespace Opm
 
#endif // OPM_FLOW_PROBLEM_BLACK_HPP