freeflow/rans/twoeq/kepsilon/staggered/fluxvariables.hh

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#ifndef DUMUX_KEPSILON_STAGGERED_FLUXVARIABLES_HH
#define DUMUX_KEPSILON_STAGGERED_FLUXVARIABLES_HH
 
#include <numeric>
#include <dumux/common/properties.hh>
#include <dumux/flux/fluxvariablesbase.hh>
#include <dumux/discretization/method.hh>
#include <dumux/freeflow/navierstokes/fluxvariables.hh>
#include <dumux/freeflow/rans/twoeq/kepsilon/fluxvariables.hh>
 
namespace Dumux {
 
// forward declaration
template<class TypeTag, class BaseFluxVariables, DiscretizationMethod discMethod>
class KEpsilonFluxVariablesImpl;
 
template<class TypeTag, class BaseFluxVariables>
class KEpsilonFluxVariablesImpl<TypeTag, BaseFluxVariables, DiscretizationMethod::staggered>
: public BaseFluxVariables
{
    using ParentType = BaseFluxVariables;
 
    using GridVariables = GetPropType<TypeTag, Properties::GridVariables>;
 
    using GridVolumeVariables = typename GridVariables::GridVolumeVariables;
    using ElementVolumeVariables = typename GridVolumeVariables::LocalView;
    using VolumeVariables = typename GridVolumeVariables::VolumeVariables;
 
    using GridFluxVariablesCache = typename GridVariables::GridFluxVariablesCache;
    using FluxVariablesCache = typename GridFluxVariablesCache::FluxVariablesCache;
 
    using GridFaceVariables = typename GridVariables::GridFaceVariables;
    using ElementFaceVariables = typename GridFaceVariables::LocalView;
    using FaceVariables = typename GridFaceVariables::FaceVariables;
 
    using ModelTraits = GetPropType<TypeTag, Properties::ModelTraits>;
    using Scalar = GetPropType<TypeTag, Properties::Scalar>;
    using GridView = GetPropType<TypeTag, Properties::GridView>;
    using Problem = GetPropType<TypeTag, Properties::Problem>;
    using Element = typename GridView::template Codim<0>::Entity;
    using FVElementGeometry = typename GetPropType<TypeTag, Properties::GridGeometry>::LocalView;
    using Indices = typename GetPropType<TypeTag, Properties::ModelTraits>::Indices;
    using SubControlVolumeFace = typename FVElementGeometry::SubControlVolumeFace;
    using CellCenterPrimaryVariables = GetPropType<TypeTag, Properties::CellCenterPrimaryVariables>;
    using FacePrimaryVariables = GetPropType<TypeTag, Properties::FacePrimaryVariables>;
 
    static constexpr int turbulentKineticEnergyEqIdx = Indices::turbulentKineticEnergyEqIdx - ModelTraits::dim();
    static constexpr int dissipationEqIdx = Indices::dissipationEqIdx - ModelTraits::dim();
 
public:
 
    CellCenterPrimaryVariables computeMassFlux(const Problem& problem,
                                               const Element &element,
                                               const FVElementGeometry& fvGeometry,
                                               const ElementVolumeVariables& elemVolVars,
                                               const ElementFaceVariables& elemFaceVars,
                                               const SubControlVolumeFace &scvf,
                                               const FluxVariablesCache& fluxVarsCache)
    {
        CellCenterPrimaryVariables flux = ParentType::computeMassFlux(problem, element, fvGeometry,
                                                                      elemVolVars, elemFaceVars, scvf, fluxVarsCache);
 
        // calculate advective flux
        auto upwindTermK = [](const auto& volVars)
        {
            return volVars.turbulentKineticEnergy();
        };
        auto upwindTermEpsilon = [](const auto& volVars)
        {
            return volVars.dissipation();
        };
 
        flux[turbulentKineticEnergyEqIdx]
            = ParentType::advectiveFluxForCellCenter(problem, elemVolVars, elemFaceVars, scvf, upwindTermK);
        flux[dissipationEqIdx ]
            = ParentType::advectiveFluxForCellCenter(problem, elemVolVars, elemFaceVars, scvf, upwindTermEpsilon);
 
        // calculate diffusive flux
        const auto& insideScv = fvGeometry.scv(scvf.insideScvIdx());
        const auto& outsideScv = fvGeometry.scv(scvf.outsideScvIdx());
        const auto& insideVolVars = elemVolVars[scvf.insideScvIdx()];
        const auto& outsideVolVars = elemVolVars[scvf.outsideScvIdx()];
 
        // effective diffusion coefficients
        Scalar insideCoeff_k = insideVolVars.kinematicEddyViscosity() / insideVolVars.sigmaK();
        Scalar outsideCoeff_k = outsideVolVars.kinematicEddyViscosity() / outsideVolVars.sigmaK();
        Scalar insideCoeff_e = insideVolVars.kinematicEddyViscosity() / insideVolVars.sigmaEpsilon();
        Scalar outsideCoeff_e = outsideVolVars.kinematicEddyViscosity() / outsideVolVars.sigmaEpsilon();
        static const auto kEpsilonEnableKinematicViscosity_
            = getParamFromGroup<bool>(problem.paramGroup(), "KEpsilon.EnableKinematicViscosity", true);
        if (kEpsilonEnableKinematicViscosity_)
        {
            insideCoeff_k += insideVolVars.kinematicViscosity();
            outsideCoeff_k += outsideVolVars.kinematicViscosity();
            insideCoeff_e += insideVolVars.kinematicViscosity();
            outsideCoeff_e += outsideVolVars.kinematicViscosity();
        }
 
        // scale by extrusion factor
        insideCoeff_k *= insideVolVars.extrusionFactor();
        outsideCoeff_k *= outsideVolVars.extrusionFactor();
        insideCoeff_e *= insideVolVars.extrusionFactor();
        outsideCoeff_e *= outsideVolVars.extrusionFactor();
 
        // average and distance
        // is more stable with simple/unweighted arithmetic mean
        Scalar coeff_k = arithmeticMean(insideCoeff_k, outsideCoeff_k);
        Scalar coeff_e = arithmeticMean(insideCoeff_e, outsideCoeff_e);
        Scalar distance = 0.0;
 
        // adapt boundary handling
        if (scvf.boundary())
        {
            distance = (insideScv.dofPosition() - scvf.ipGlobal()).two_norm();
            coeff_k = insideCoeff_k;
            coeff_e = insideCoeff_e;
        }
        else
        {
            distance = (outsideScv.dofPosition() - insideScv.dofPosition()).two_norm();
        }
 
        const auto bcTypes = problem.boundaryTypes(element, scvf);
        if (!(scvf.boundary() && (bcTypes.isOutflow(Indices::turbulentKineticEnergyEqIdx)
                                  || bcTypes.isSymmetry()
                                  || problem.isOnWall(scvf))))
        {
            if (!(insideVolVars.isMatchingPoint() && outsideVolVars.isMatchingPoint())
                || !(insideVolVars.isMatchingPoint() && outsideVolVars.inNearWallRegion())
                || !(insideVolVars.inNearWallRegion() && outsideVolVars.isMatchingPoint()))
            {
                flux[turbulentKineticEnergyEqIdx]
                    += coeff_k / distance
                       * (insideVolVars.turbulentKineticEnergy() - outsideVolVars.turbulentKineticEnergy())
                       * scvf.area();
            }
        }
        if (!(scvf.boundary() && (bcTypes.isOutflow(Indices::dissipationEqIdx)
                                  || bcTypes.isSymmetry())))
        {
            flux[dissipationEqIdx]
                += coeff_e / distance
                   * (insideVolVars.dissipation() - outsideVolVars.dissipation())
                   * scvf.area();
        }
        return flux;
    }
 
    FacePrimaryVariables computeMomentumFlux(const Problem& problem,
                                             const Element& element,
                                             const SubControlVolumeFace& scvf,
                                             const FVElementGeometry& fvGeometry,
                                             const ElementVolumeVariables& elemVolVars,
                                             const ElementFaceVariables& elemFaceVars,
                                             const GridFluxVariablesCache& gridFluxVarsCache)
    {
        const auto& insideVolVars = elemVolVars[scvf.insideScvIdx()];
 
        return ParentType::computeFrontalMomentumFlux(problem, element, scvf, fvGeometry, elemVolVars, elemFaceVars, gridFluxVarsCache)
               + ParentType::computeLateralMomentumFlux(problem, element, scvf, fvGeometry, elemVolVars, elemFaceVars, gridFluxVarsCache)
               + 2.0 / ModelTraits::dim() * insideVolVars.density() * insideVolVars.turbulentKineticEnergy()
                 * scvf.area() * scvf.directionSign() * insideVolVars.extrusionFactor();
    }
};
 
} // end namespace
 
#endif