RegularizedVanGenuchtenParams.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:
/*
  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_REGULARIZED_VAN_GENUCHTEN_PARAMS_HPP
#define OPM_REGULARIZED_VAN_GENUCHTEN_PARAMS_HPP
 
#include "VanGenuchten.hpp"
#include "VanGenuchtenParams.hpp"
 
#include <opm/material/common/Spline.hpp>
 
#include <cassert>
 
namespace Opm {
template<class TraitsT>
class RegularizedVanGenuchtenParams : public VanGenuchtenParams<TraitsT>
{
    typedef typename TraitsT::Scalar Scalar;
    typedef VanGenuchtenParams<TraitsT> Parent;
    typedef ::Opm::VanGenuchten<TraitsT> VanGenuchten;
 
public:
    using Parent :: finalize;
 
    typedef TraitsT Traits;
 
    RegularizedVanGenuchtenParams()
        : pcnwLowSw_(0.01)
        , pcnwHighSw_(0.99)
    {}
 
    RegularizedVanGenuchtenParams(Scalar vgAlpha, Scalar vgN)
        : Parent(vgAlpha, vgN)
        , pcnwLowSw_(0.01)
        , pcnwHighSw_(0.99)
    {
        finalize();
    }
 
    void finalize()
    {
        Parent::finalize();
 
        pcnwLow_ = VanGenuchten::twoPhaseSatPcnw(*this, pcnwLowSw_);
        pcnwSlopeLow_ = dPcnw_dSw_(pcnwLowSw_);
        pcnwHigh_ = VanGenuchten::twoPhaseSatPcnw(*this, pcnwHighSw_);
        pcnwSlopeHigh_ = 2*(0.0 - pcnwHigh_)/(1.0 - pcnwHighSw_);
 
        Scalar mThreshold = dPcnw_dSw_(pcnwHighSw_);
 
        pcnwHighSpline_.set(pcnwHighSw_, 1.0, // x0, x1
                            pcnwHigh_, 0, // y0, y1
                            mThreshold, pcnwSlopeHigh_); // m0, m1
    }
 
    Scalar pcnwLowSw() const
    { EnsureFinalized::check(); return pcnwLowSw_; }
 
    Scalar pcnwLow() const
    { EnsureFinalized::check(); return pcnwLow_; }
 
    Scalar pcnwSlopeLow() const
    { EnsureFinalized::check(); return pcnwSlopeLow_; }
 
    void setPCLowSw(Scalar value)
    { pcnwLowSw_ = value; }
 
    Scalar pcnwHighSw() const
    { EnsureFinalized::check(); return pcnwHighSw_; }
 
    Scalar pcnwHigh() const
    { EnsureFinalized::check(); return pcnwHigh_; }
 
    const Spline<Scalar>& pcnwHighSpline() const
    { EnsureFinalized::check(); return pcnwHighSpline_; }
 
    Scalar pcnwSlopeHigh() const
    { EnsureFinalized::check(); return pcnwSlopeHigh_; }
 
    void setPCHighSw(Scalar value)
    { pcnwHighSw_ = value; }
 
private:
    Scalar dPcnw_dSw_(Scalar Sw) const
    {
        // use finite differences to calculate the derivative w.r.t. Sw of the
        // unregularized curve's capillary pressure.
        const Scalar eps = 1e-7;
        Scalar pc1 = VanGenuchten::twoPhaseSatPcnw(*this, Sw - eps);
        Scalar pc2 = VanGenuchten::twoPhaseSatPcnw(*this, Sw + eps);
        return (pc2 - pc1)/(2*eps);
    }
 
    Scalar pcnwLowSw_;
    Scalar pcnwHighSw_;
 
    Scalar pcnwLow_;
    Scalar pcnwHigh_;
 
    Scalar pcnwSlopeLow_;
    Scalar pcnwSlopeHigh_;
 
    Spline<Scalar> pcnwHighSpline_;
};
} // namespace Opm
 
#endif