IdealGas.hpp

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// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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/*
  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_IDEAL_GAS_HPP
#define OPM_IDEAL_GAS_HPP
 
#include <opm/material/Constants.hpp>
 
namespace Opm {
template <class Scalar>
class IdealGas
{
public:
    static const Scalar R;
 
    template <class Evaluation>
    static Evaluation density(const Evaluation& avgMolarMass,
                              const Evaluation& temperature,
                              const Evaluation& pressure)
    { return pressure*avgMolarMass/(R*temperature); }
 
    template <class Evaluation>
    static Evaluation pressure(const Evaluation& temperature,
                               const Evaluation& rhoMolar)
    { return R*temperature*rhoMolar; }
 
    template <class Evaluation>
    static Evaluation molarDensity(const Evaluation& temperature,
                                   const Evaluation& pressure)
    { return pressure/(R*temperature); }
};
 
template <class Scalar>
const Scalar IdealGas<Scalar>::R = Constants<Scalar>::R;
 
} // namespace Opm
 
#endif