opm-simulators/opm/models/blackoil/blackoilmodel.hh

// -*- 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.
*/
/*!
 * \file
 *
 * \copydoc Opm::BlackOilModel
 */
#ifndef EWOMS_BLACK_OIL_MODEL_HH
#define EWOMS_BLACK_OIL_MODEL_HH

#include <opm/material/densead/Math.hpp>

#include "blackoilproblem.hh"
#include "blackoilindices.hh"
#include "blackoiltwophaseindices.hh"
#include "blackoilextensivequantities.hh"
#include "blackoilprimaryvariables.hh"
#include "blackoilintensivequantities.hh"
#include "blackoilratevector.hh"
#include "blackoilboundaryratevector.hh"
#include "blackoillocalresidual.hh"
#include "blackoilnewtonmethod.hh"
#include "blackoilproperties.hh"
#include "blackoilsolventmodules.hh"
#include "blackoilpolymermodules.hh"
#include "blackoilfoammodules.hh"
#include "blackoilbrinemodules.hh"
#include "blackoilextbomodules.hh"
#include "blackoildarcyfluxmodule.hh"
#include "blackoilmicpmodules.hh"

#include <opm/models/common/multiphasebasemodel.hh>
#include <opm/models/io/vtkcompositionmodule.hh>
#include <opm/models/io/vtkblackoilmodule.hh>
#include "blackoildiffusionmodule.hh"
#include <opm/models/io/vtkdiffusionmodule.hh>

#include <opm/material/fluidsystems/BlackOilFluidSystem.hpp>

#include <sstream>
#include <string>

namespace Opm {
template <class TypeTag>
class BlackOilModel;

template <class TypeTag>
class EclVanguard;
}

namespace Opm::Properties {

namespace TTag {
//! The type tag for the black-oil problems
struct BlackOilModel { using InheritsFrom = std::tuple<VtkComposition,
                                                       VtkBlackOilEnergy,
                                                       VtkDiffusion,
                                                       VtkBlackOilPolymer,
                                                       VtkBlackOilSolvent,
                                                       VtkBlackOil,
                                                       MultiPhaseBaseModel,
                                                       VtkBlackOilMICP>; };
} // namespace TTag

//! Set the local residual function
template<class TypeTag>
struct LocalResidual<TypeTag, TTag::BlackOilModel> { using type = BlackOilLocalResidual<TypeTag>; };

//! Use the black-oil specific newton method
template<class TypeTag>
struct NewtonMethod<TypeTag, TTag::BlackOilModel> { using type = BlackOilNewtonMethod<TypeTag>; };

//! The Model property
template<class TypeTag>
struct Model<TypeTag, TTag::BlackOilModel> { using type = BlackOilModel<TypeTag>; };

//! The Problem property
template<class TypeTag>
struct BaseProblem<TypeTag, TTag::BlackOilModel> { using type = BlackOilProblem<TypeTag>; };

//! the RateVector property
template<class TypeTag>
struct RateVector<TypeTag, TTag::BlackOilModel> { using type = BlackOilRateVector<TypeTag>; };

//! the BoundaryRateVector property
template<class TypeTag>
struct BoundaryRateVector<TypeTag, TTag::BlackOilModel> { using type = BlackOilBoundaryRateVector<TypeTag>; };

//! the PrimaryVariables property
template<class TypeTag>
struct PrimaryVariables<TypeTag, TTag::BlackOilModel> { using type = BlackOilPrimaryVariables<TypeTag>; };

//! the IntensiveQuantities property
template<class TypeTag>
struct IntensiveQuantities<TypeTag, TTag::BlackOilModel> { using type = BlackOilIntensiveQuantities<TypeTag>; };

//! the ExtensiveQuantities property
template<class TypeTag>
struct ExtensiveQuantities<TypeTag, TTag::BlackOilModel> { using type = BlackOilExtensiveQuantities<TypeTag>; };

//! Use the the velocity module which is aware of the black-oil specific model extensions
//! (i.e., the polymer and solvent extensions)
template<class TypeTag>
struct FluxModule<TypeTag, TTag::BlackOilModel> { using type = BlackOilDarcyFluxModule<TypeTag>; };

//! The indices required by the model
template<class TypeTag>
struct Indices<TypeTag, TTag::BlackOilModel>
{ using type = BlackOilIndices<getPropValue<TypeTag, Properties::EnableSolvent>(),
                               getPropValue<TypeTag, Properties::EnableExtbo>(),
                               getPropValue<TypeTag, Properties::EnablePolymer>(),
                               getPropValue<TypeTag, Properties::EnableEnergy>(),
                               getPropValue<TypeTag, Properties::EnableFoam>(),
                               getPropValue<TypeTag, Properties::EnableBrine>(),
                               /*PVOffset=*/0,
                               getPropValue<TypeTag, Properties::EnableMICP>()>; };

//! Set the fluid system to the black-oil fluid system by default
template<class TypeTag>
struct FluidSystem<TypeTag, TTag::BlackOilModel>
{
private:
    using Scalar = GetPropType<TypeTag, Properties::Scalar>;
    using Evaluation = GetPropType<TypeTag, Properties::Evaluation>;

public:
    using type = BlackOilFluidSystem<Scalar>;
};

// by default, all ECL extension modules are disabled
template<class TypeTag>
struct EnableSolvent<TypeTag, TTag::BlackOilModel> { static constexpr bool value = false; };
template<class TypeTag>
struct EnableExtbo<TypeTag, TTag::BlackOilModel> { static constexpr bool value = false; };
template<class TypeTag>
struct EnablePolymer<TypeTag, TTag::BlackOilModel> { static constexpr bool value = false; };
template<class TypeTag>
struct EnablePolymerMW<TypeTag, TTag::BlackOilModel> { static constexpr bool value = false; };
template<class TypeTag>
struct EnableFoam<TypeTag, TTag::BlackOilModel> { static constexpr bool value = false; };
template<class TypeTag>
struct EnableBrine<TypeTag, TTag::BlackOilModel> { static constexpr bool value = false; };
template<class TypeTag>
struct EnableEvaporation<TypeTag, TTag::BlackOilModel> { static constexpr bool value = false; };
template<class TypeTag>
struct EnableSaltPrecipitation<TypeTag, TTag::BlackOilModel> { static constexpr bool value = false; };
template<class TypeTag>
struct EnableMICP<TypeTag, TTag::BlackOilModel> { static constexpr bool value = false; };

//! By default, the blackoil model is isothermal and does not conserve energy
template<class TypeTag>
struct EnableTemperature<TypeTag, TTag::BlackOilModel> { static constexpr bool value = false; };
template<class TypeTag>
struct EnableEnergy<TypeTag, TTag::BlackOilModel> { static constexpr bool value = false; };

//! disable diffusion by default
template<class TypeTag>
struct EnableDiffusion<TypeTag, TTag::BlackOilModel> { static constexpr bool value = false; };

//! by default, scale the energy equation by the inverse of the energy required to heat
//! up one kg of water by 30 Kelvin. If we conserve surface volumes, this must be divided
//! by the weight of one cubic meter of water. This is required to make the "dumb" linear
//! solvers that do not weight the components of the solutions do the right thing.
//! by default, don't scale the energy equation, i.e. assume that a reasonable linear
//! solver is used. (Not scaling it makes debugging quite a bit easier.)
template<class TypeTag>
struct BlackOilEnergyScalingFactor<TypeTag, TTag::BlackOilModel>
{
private:
    using Scalar = GetPropType<TypeTag, Properties::Scalar>;
    static constexpr Scalar alpha = getPropValue<TypeTag, Properties::BlackoilConserveSurfaceVolume>() ? 1000.0 : 1.0;

public:
    using type = Scalar;
    static constexpr Scalar value = 1.0/(30.0*4184.0*alpha);
};

// by default, ebos formulates the conservation equations in terms of mass not surface
// volumes
template<class TypeTag>
struct BlackoilConserveSurfaceVolume<TypeTag, TTag::BlackOilModel> { static constexpr bool value = false; };

} // namespace Opm::Properties

namespace Opm {

/*!
 * \ingroup BlackOilModel
 * \brief A fully-implicit black-oil flow model.
 *
 * The black-oil model is a three-phase, three-component model widely
 * used for oil reservoir simulation.  The phases are denoted by lower
 * index \f$\alpha \in \{ w, g, o \}\f$ ("water", "gas" and "oil") and
 * the components by upper index \f$\kappa \in \{ W, G, O \}\f$
 * ("Water", "Gas" and "Oil"). The model assumes partial miscibility:
 *
 * - Water and the gas phases are immisicible and are assumed to be
 *   only composed of the water and gas components respectively-
 * - The oil phase is assumed to be a mixture of the gas and the oil
 *  components.
 *
 * The densities of the phases are determined by so-called
 * <i>formation volume factors</i>:
 *
 * \f[
 * B_\alpha := \frac{\varrho_\alpha(1\,\text{bar})}{\varrho_\alpha(p_\alpha)}
 * \f]
 *
 * Since the gas and water phases are assumed to be immiscible, this
 * is sufficint to calculate their density. For the formation volume
 * factor of the the oil phase \f$B_o\f$ determines the density of
 * *saturated* oil, i.e. the density of the oil phase if some gas
 * phase is present.
 *
 * The composition of the oil phase is given by the <i>gas dissolution factor</i>
 * \f$R_s\f$, which defined as the volume of gas at atmospheric pressure that is
 * dissolved in a given amount of oil at reservoir pressure:
 *
 * \f[
 * R_s := \frac{\varrho_{o}^G}{\varrho_o^O}\;.
 * \f]
 *
 * This allows to calculate all quantities required for the
 * mass-conservation equations for each component, i.e.
 *
 * \f[
 * \sum_\alpha \frac{\partial\;\phi c_\alpha^\kappa S_\alpha }{\partial t}
 * - \sum_\alpha \mathrm{div} \left\{ c_\alpha^\kappa \mathbf{v}_\alpha \right\}
 * - q^\kappa = 0 \;,
 * \f]
 * where \f$\mathrm{v}_\alpha\f$ is the filter velocity of the phase
 * \f$\alpha\f$.
 *
 * By default \f$\mathrm{v}_\alpha\f$ is determined by using the
 * standard multi-phase Darcy approach, i.e.
 * \f[ \mathbf{v}_\alpha = - \frac{k_{r\alpha}}{\mu_\alpha} \mathbf{K}
 *\left(\mathbf{grad}\, p_\alpha - \varrho_{\alpha} \mathbf{g} \right) \;, \f]
 * although the actual approach which is used can be specified via the
 * \c FluxModule property. For example, the velocity model can by
 * changed to the Forchheimer approach by
 * \code
 * template<class TypeTag>
struct FluxModule<TypeTag, TTag::MyProblemTypeTag> { using type = Opm::ForchheimerFluxModule<TypeTag>; };
 * \endcode
 *
 * The primary variables used by this model are:
 * - The pressure of the phase with the lowest index
 * - The two saturations of the phases with the lowest indices
 */
template<class TypeTag >
class BlackOilModel
    : public MultiPhaseBaseModel<TypeTag>
{
    using Implementation = GetPropType<TypeTag, Properties::Model>;
    using ParentType = MultiPhaseBaseModel<TypeTag>;

    using Scalar = GetPropType<TypeTag, Properties::Scalar>;
    using Indices = GetPropType<TypeTag, Properties::Indices>;
    using FluidSystem = GetPropType<TypeTag, Properties::FluidSystem>;
    using Simulator = GetPropType<TypeTag, Properties::Simulator>;
    using Discretization = GetPropType<TypeTag, Properties::Discretization>;
    using ElementContext = GetPropType<TypeTag, Properties::ElementContext>;
    using PrimaryVariables = GetPropType<TypeTag, Properties::PrimaryVariables>;

    enum { numPhases = getPropValue<TypeTag, Properties::NumPhases>() };
    enum { numComponents = FluidSystem::numComponents };
    enum { numEq = getPropValue<TypeTag, Properties::NumEq>() };
    enum { enableDiffusion = getPropValue<TypeTag, Properties::EnableDiffusion>() };

    static const bool compositionSwitchEnabled = Indices::compositionSwitchIdx >= 0;
    static const bool waterEnabled = Indices::waterEnabled;

    using SolventModule = BlackOilSolventModule<TypeTag>;
    using ExtboModule = BlackOilExtboModule<TypeTag>;
    using PolymerModule = BlackOilPolymerModule<TypeTag>;
    using EnergyModule = BlackOilEnergyModule<TypeTag>;
    using DiffusionModule = BlackOilDiffusionModule<TypeTag, enableDiffusion>;
    using MICPModule = BlackOilMICPModule<TypeTag>;

public:

    using LocalResidual = GetPropType<TypeTag, Properties::LocalResidual>;

    BlackOilModel(Simulator& simulator)
        : ParentType(simulator)
    {}

    /*!
     * \brief Register all run-time parameters for the immiscible model.
     */
    static void registerParameters()
    {
        ParentType::registerParameters();

        SolventModule::registerParameters();
        ExtboModule::registerParameters();
        PolymerModule::registerParameters();
        EnergyModule::registerParameters();
        DiffusionModule::registerParameters();
        MICPModule::registerParameters();

        // register runtime parameters of the VTK output modules
        VtkBlackOilModule<TypeTag>::registerParameters();
        VtkCompositionModule<TypeTag>::registerParameters();

        if (enableDiffusion)
            VtkDiffusionModule<TypeTag>::registerParameters();
    }

    /*!
     * \copydoc FvBaseDiscretization::name
     */
    static std::string name()
    { return "blackoil"; }

    /*!
     * \copydoc FvBaseDiscretization::primaryVarName
     */
    std::string primaryVarName(int pvIdx) const
    {
        std::ostringstream oss;

        if (pvIdx == Indices::waterSaturationIdx)
            oss << "saturation_" << FluidSystem::phaseName(FluidSystem::waterPhaseIdx);
        else if (pvIdx == Indices::pressureSwitchIdx)
            oss << "pressure_switching";
        else if (static_cast<int>(pvIdx) == Indices::compositionSwitchIdx)
            oss << "composition_switching";
        else if (SolventModule::primaryVarApplies(pvIdx))
            return SolventModule::primaryVarName(pvIdx);
        else if (ExtboModule::primaryVarApplies(pvIdx))
            return ExtboModule::primaryVarName(pvIdx);
        else if (PolymerModule::primaryVarApplies(pvIdx))
            return PolymerModule::primaryVarName(pvIdx);
        else if (EnergyModule::primaryVarApplies(pvIdx))
            return EnergyModule::primaryVarName(pvIdx);
        else
            assert(false);

        return oss.str();
    }

    /*!
     * \copydoc FvBaseDiscretization::eqName
     */
    std::string eqName(int eqIdx) const
    {
        std::ostringstream oss;

        if (Indices::conti0EqIdx <= eqIdx && eqIdx < Indices::conti0EqIdx + numComponents)
            oss << "conti_" << FluidSystem::phaseName(eqIdx - Indices::conti0EqIdx);
        else if (SolventModule::eqApplies(eqIdx))
            return SolventModule::eqName(eqIdx);
        else if (ExtboModule::eqApplies(eqIdx))
            return ExtboModule::eqName(eqIdx);
        else if (PolymerModule::eqApplies(eqIdx))
            return PolymerModule::eqName(eqIdx);
        else if (EnergyModule::eqApplies(eqIdx))
            return EnergyModule::eqName(eqIdx);
        else
            assert(false);

        return oss.str();
    }

    /*!
     * \copydoc FvBaseDiscretization::primaryVarWeight
     */
    Scalar primaryVarWeight(unsigned globalDofIdx, unsigned pvIdx) const
    {
        // do not care about the auxiliary equations as they are supposed to scale
        // themselves
        if (globalDofIdx >= this->numGridDof())
            return 1.0;

        // saturations are always in the range [0, 1]!
        if (int(Indices::waterSaturationIdx) == int(pvIdx))
            return 1.0;

        // oil pressures usually are in the range of 100 to 500 bars for typical oil
        // reservoirs (which is the only relevant application for the black-oil model).
        else if (int(Indices::pressureSwitchIdx) == int(pvIdx))
            return 1.0/300e5;

        // deal with primary variables stemming from the solvent module
        else if (SolventModule::primaryVarApplies(pvIdx))
            return SolventModule::primaryVarWeight(pvIdx);

        // deal with primary variables stemming from the extBO module
        else if (ExtboModule::primaryVarApplies(pvIdx))
            return ExtboModule::primaryVarWeight(pvIdx);

        // deal with primary variables stemming from the polymer module
        else if (PolymerModule::primaryVarApplies(pvIdx))
            return PolymerModule::primaryVarWeight(pvIdx);

        // deal with primary variables stemming from the energy module
        else if (EnergyModule::primaryVarApplies(pvIdx))
            return EnergyModule::primaryVarWeight(pvIdx);

        // if the primary variable is either the gas saturation, Rs or Rv
        assert(int(Indices::compositionSwitchIdx) == int(pvIdx));

        auto pvMeaning = this->solution(0)[globalDofIdx].primaryVarsMeaning();
        if (pvMeaning == PrimaryVariables::Sw_po_Sg)
            return 1.0; // gas saturation
        else if (pvMeaning == PrimaryVariables::Sw_po_Rs)
            return 1.0/250.; // gas dissolution factor
        else {
            assert(pvMeaning == PrimaryVariables::Sw_pg_Rv);
            return 1.0/0.025; // oil vaporization factor
        }

    }

    /*!
     * \copydoc FvBaseDiscretization::eqWeight
     */
    Scalar eqWeight(unsigned globalDofIdx, unsigned eqIdx) const
    {
        // do not care about the auxiliary equations as they are supposed to scale
        // themselves
        if (globalDofIdx >= this->numGridDof())
            return 1.0;

        // we do not care much about water, so it gets de-prioritized by a factor of 100
        static constexpr Scalar waterPriority = 1e-2;

        if (getPropValue<TypeTag, Properties::BlackoilConserveSurfaceVolume>()) {
            // Roughly convert the surface volume of the fluids from m^3 to kg. (in this
            // context, it does not really matter if the actual densities are off by a
            // factor of two or three.)
            switch (eqIdx) {
            case Indices::conti0EqIdx + FluidSystem::waterCompIdx:
                return 1000.0*waterPriority;

            case Indices::conti0EqIdx + FluidSystem::gasCompIdx:
                return 1.0;

            case Indices::conti0EqIdx + FluidSystem::oilCompIdx:
                return 650.0;
            }
        }

        if (SolventModule::eqApplies(eqIdx))
            return SolventModule::eqWeight(eqIdx);

        if (ExtboModule::eqApplies(eqIdx))
            return ExtboModule::eqWeight(eqIdx);

        else if (PolymerModule::eqApplies(eqIdx))
            return PolymerModule::eqWeight(eqIdx);

        else if (EnergyModule::eqApplies(eqIdx))
            return EnergyModule::eqWeight(eqIdx);

        // it is said that all kilograms are born equal (except water)!
        if (eqIdx == Indices::conti0EqIdx + FluidSystem::waterCompIdx)
            return waterPriority;
        return 1.0;
    }

    /*!
     * \brief Write the current solution for a degree of freedom to a
     *        restart file.
     *
     * \param outstream The stream into which the vertex data should
     *                  be serialized to
     * \param dof The Dune entity which's data should be serialized
     */
    template <class DofEntity>
    void serializeEntity(std::ostream& outstream, const DofEntity& dof)
    {
        unsigned dofIdx = static_cast<unsigned>(asImp_().dofMapper().index(dof));

        // write phase state
        if (!outstream.good())
            throw std::runtime_error("Could not serialize degree of freedom "+std::to_string(dofIdx));

        // write the primary variables
        const auto& priVars = this->solution(/*timeIdx=*/0)[dofIdx];
        for (unsigned eqIdx = 0; eqIdx < numEq; ++eqIdx)
            outstream << priVars[eqIdx] << " ";

        // write the pseudo primary variables
        outstream << priVars.primaryVarsMeaning() << " ";
        outstream << priVars.pvtRegionIndex() << " ";

        SolventModule::serializeEntity(*this, outstream, dof);
        ExtboModule::serializeEntity(*this, outstream, dof);
        PolymerModule::serializeEntity(*this, outstream, dof);
        EnergyModule::serializeEntity(*this, outstream, dof);
    }

    /*!
     * \brief Reads the current solution variables for a degree of
     *        freedom from a restart file.
     *
     * \param instream The stream from which the vertex data should
     *                  be deserialized from
     * \param dof The Dune entity which's data should be deserialized
     */
    template <class DofEntity>
    void deserializeEntity(std::istream& instream,
                           const DofEntity& dof)
    {
        unsigned dofIdx = static_cast<unsigned>(asImp_().dofMapper().index(dof));

        // read in the "real" primary variables of the DOF
        auto& priVars = this->solution(/*timeIdx=*/0)[dofIdx];
        for (unsigned eqIdx = 0; eqIdx < numEq; ++eqIdx) {
            if (!instream.good())
                throw std::runtime_error("Could not deserialize degree of freedom "+std::to_string(dofIdx));
            instream >> priVars[eqIdx];
        }

        // read the pseudo primary variables
        unsigned primaryVarsMeaning;
        instream >> primaryVarsMeaning;

        unsigned pvtRegionIdx;
        instream >> pvtRegionIdx;

        if (!instream.good())
            throw std::runtime_error("Could not deserialize degree of freedom "+std::to_string(dofIdx));

        SolventModule::deserializeEntity(*this, instream, dof);
        ExtboModule::deserializeEntity(*this, instream, dof);
        PolymerModule::deserializeEntity(*this, instream, dof);
        EnergyModule::deserializeEntity(*this, instream, dof);

        using PVM = typename PrimaryVariables::PrimaryVarsMeaning;
        priVars.setPrimaryVarsMeaning(static_cast<PVM>(primaryVarsMeaning));
        priVars.setPvtRegionIndex(pvtRegionIdx);
    }

    /*!
     * \brief Deserializes the state of the model.
     *
     * \tparam Restarter The type of the serializer class
     *
     * \param res The serializer object
     */
    template <class Restarter>
    void deserialize(Restarter& res)
    {
        ParentType::deserialize(res);

        // set the PVT indices of the primary variables. This is also done by writing
        // them into the restart file and re-reading them, but it is better to calculate
        // them from scratch because the input could have been changed in this regard...
        ElementContext elemCtx(this->simulator_);
        auto elemIt = this->gridView().template begin</*codim=*/0>();
        auto elemEndIt = this->gridView().template end</*codim=*/0>();
        for (; elemIt != elemEndIt; ++ elemIt) {
            elemCtx.updateStencil(*elemIt);
            for (unsigned dofIdx = 0; dofIdx < elemCtx.numPrimaryDof(/*timIdx=*/0); ++dofIdx) {
                unsigned globalDofIdx = elemCtx.globalSpaceIndex(dofIdx, /*timIdx=*/0);
                updatePvtRegionIndex_(this->solution(/*timeIdx=*/0)[globalDofIdx],
                                      elemCtx,
                                      dofIdx,
                                      /*timeIdx=*/0);
            }
        }

        this->solution(/*timeIdx=*/1) = this->solution(/*timeIdx=*/0);
    }

/*
    // hack: this interferes with the static polymorphism trick
protected:
    friend ParentType;
    friend Discretization;
*/

    template <class Context>
    void supplementInitialSolution_(PrimaryVariables& priVars,
                                    const Context& context,
                                    unsigned dofIdx,
                                    unsigned timeIdx)
    { updatePvtRegionIndex_(priVars, context, dofIdx, timeIdx); }

    void registerOutputModules_()
    {
        ParentType::registerOutputModules_();

        // add the VTK output modules which make sense for the blackoil model
        SolventModule::registerOutputModules(*this, this->simulator_);
        PolymerModule::registerOutputModules(*this, this->simulator_);
        EnergyModule::registerOutputModules(*this, this->simulator_);
        MICPModule::registerOutputModules(*this, this->simulator_);

        this->addOutputModule(new VtkBlackOilModule<TypeTag>(this->simulator_));
        this->addOutputModule(new VtkCompositionModule<TypeTag>(this->simulator_));

        if (enableDiffusion)
            this->addOutputModule(new VtkDiffusionModule<TypeTag>(this->simulator_));
    }

private:
    Implementation& asImp_()
    { return *static_cast<Implementation*>(this); }
    const Implementation& asImp_() const
    { return *static_cast<const Implementation*>(this); }

    template <class Context>
    void updatePvtRegionIndex_(PrimaryVariables& priVars,
                               const Context& context,
                               unsigned dofIdx,
                               unsigned timeIdx)
    {
        unsigned regionIdx = context.problem().pvtRegionIndex(context, dofIdx, timeIdx);
        priVars.setPvtRegionIndex(regionIdx);
    }
};
} // namespace Opm

#endif