alphatFilmWallFunctionFvPatchScalarField.C

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#include "alphatFilmWallFunctionFvPatchScalarField.H"
#include "thermophysicalTransportModel.H"
#include "surfaceFilmRegionModel.H"
#include "fvPatchFieldMapper.H"
#include "volFields.H"
#include "addToRunTimeSelectionTable.H"
#include "mappedWallPolyPatch.H"
#include "mapDistribute.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{
namespace compressible
{
namespace RASModels
{

// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

alphatFilmWallFunctionFvPatchScalarField::
alphatFilmWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF
)
:
    fixedValueFvPatchScalarField(p, iF),
    B_(5.5),
    yPlusCrit_(11.05),
    Cmu_(0.09),
    kappa_(0.41),
    Prt_(0.85)
{}


alphatFilmWallFunctionFvPatchScalarField::
alphatFilmWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const dictionary& dict
)
:
    fixedValueFvPatchScalarField(p, iF, dict),
    B_(dict.lookupOrDefault("B", 5.5)),
    yPlusCrit_(dict.lookupOrDefault("yPlusCrit", 11.05)),
    Cmu_(dict.lookupOrDefault("Cmu", 0.09)),
    kappa_(dict.lookupOrDefault("kappa", 0.41)),
    Prt_(dict.lookupOrDefault("Prt", 0.85))
{}


alphatFilmWallFunctionFvPatchScalarField::
alphatFilmWallFunctionFvPatchScalarField
(
    const alphatFilmWallFunctionFvPatchScalarField& ptf,
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const fvPatchFieldMapper& mapper
)
:
    fixedValueFvPatchScalarField(ptf, p, iF, mapper),
    B_(ptf.B_),
    yPlusCrit_(ptf.yPlusCrit_),
    Cmu_(ptf.Cmu_),
    kappa_(ptf.kappa_),
    Prt_(ptf.Prt_)
{}


alphatFilmWallFunctionFvPatchScalarField::
alphatFilmWallFunctionFvPatchScalarField
(
    const alphatFilmWallFunctionFvPatchScalarField& fwfpsf,
    const DimensionedField<scalar, volMesh>& iF
)
:
    fixedValueFvPatchScalarField(fwfpsf, iF),
    B_(fwfpsf.B_),
    yPlusCrit_(fwfpsf.yPlusCrit_),
    Cmu_(fwfpsf.Cmu_),
    kappa_(fwfpsf.kappa_),
    Prt_(fwfpsf.Prt_)
{}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

void alphatFilmWallFunctionFvPatchScalarField::updateCoeffs()
{
    if (updated())
    {
        return;
    }

    typedef regionModels::surfaceFilmModels::surfaceFilmRegionModel modelType;

    // Since we're inside initEvaluate/evaluate there might be processor
    // comms underway. Change the tag we use.
    int oldTag = UPstream::msgType();
    UPstream::msgType() = oldTag+1;

    bool foundFilm =
        db().time().foundObject<modelType>("surfaceFilmProperties");

    if (!foundFilm)
    {
        // Do nothing on construction - film model doesn't exist yet
        return;
    }

    const label patchi = patch().index();

    // Retrieve phase change mass from surface film model
    const modelType& filmModel =
        db().time().lookupObject<modelType>("surfaceFilmProperties");

    const label filmPatchi = filmModel.regionPatchID(patchi);

    tmp<volScalarField> mDotFilm(filmModel.primaryMassTrans());
    scalarField mDotFilmp = mDotFilm().boundaryField()[filmPatchi];
    filmModel.toPrimary(filmPatchi, mDotFilmp);

    const thermophysicalTransportModel& ttm =
        db().lookupObject<thermophysicalTransportModel>
        (
            IOobject::groupName
            (
                thermophysicalTransportModel::typeName,
                internalField().group()
            )
        );

    const compressibleMomentumTransportModel& turbModel =
        ttm.momentumTransport();

    const scalarField& y = turbModel.y()[patchi];
    const scalarField& rhow = turbModel.rho().boundaryField()[patchi];
    const tmp<volScalarField> tk = turbModel.k();
    const volScalarField& k = tk();
    const tmp<scalarField> tmuw = turbModel.mu(patchi);
    const scalarField& muw = tmuw();
    const tmp<scalarField> talpha = ttm.thermo().alpha(patchi);
    const scalarField& alphaw = talpha();

    const scalar Cmu25 = pow(Cmu_, 0.25);

    // Populate alphat field values
    scalarField& alphat = *this;
    forAll(alphat, facei)
    {
        label faceCelli = patch().faceCells()[facei];

        scalar uTau = Cmu25*sqrt(k[faceCelli]);

        scalar yPlus = y[facei]*uTau/(muw[facei]/rhow[facei]);

        scalar Pr = muw[facei]/alphaw[facei];

        scalar factor = 0.0;
        scalar mStar = mDotFilmp[facei]/(y[facei]*uTau);
        if (yPlus > yPlusCrit_)
        {
            scalar expTerm = exp(min(50.0, yPlusCrit_*mStar*Pr));
            scalar yPlusRatio = yPlus/yPlusCrit_;
            scalar powTerm = mStar*Prt_/kappa_;
            factor =
                mStar/(expTerm*(pow(yPlusRatio, powTerm)) - 1.0 + rootVSmall);
        }
        else
        {
            scalar expTerm = exp(min(50.0, yPlus*mStar*Pr));
            factor = mStar/(expTerm - 1.0 + rootVSmall);
        }

        scalar dx = patch().deltaCoeffs()[facei];

        scalar alphaEff = dx*rhow[facei]*uTau*factor;

        alphat[facei] = max(alphaEff - alphaw[facei], 0.0);
    }

    // Restore tag
    UPstream::msgType() = oldTag;

    fixedValueFvPatchScalarField::updateCoeffs();
}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

void alphatFilmWallFunctionFvPatchScalarField::write(Ostream& os) const
{
    fvPatchField<scalar>::write(os);
    writeEntry(os, "B", B_);
    writeEntry(os, "yPlusCrit", yPlusCrit_);
    writeEntry(os, "Cmu", Cmu_);
    writeEntry(os, "kappa", kappa_);
    writeEntry(os, "Prt", Prt_);
    writeEntry(os, "value", *this);
}


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

makePatchTypeField
(
    fvPatchScalarField,
    alphatFilmWallFunctionFvPatchScalarField
);

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace RASModels
} // End namespace compressible
} // End namespace Foam

// ************************************************************************* //