alphatFilmWallFunctionFvPatchScalarField.C

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    Copyright (C) 2020 OpenCFD Ltd.
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#include "alphatFilmWallFunctionFvPatchScalarField.H"
#include "turbulentFluidThermoModel.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),
    filmRegionName_("surfaceFilmProperties"),
    B_(5.5),
    yPlusCrit_(11.05),
    Cmu_(0.09),
    kappa_(0.41),
    Prt_(0.85)
{}
 
 
alphatFilmWallFunctionFvPatchScalarField::
alphatFilmWallFunctionFvPatchScalarField
(
    const alphatFilmWallFunctionFvPatchScalarField& ptf,
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const fvPatchFieldMapper& mapper
)
:
    fixedValueFvPatchScalarField(ptf, p, iF, mapper),
    filmRegionName_(ptf.filmRegionName_),
    B_(ptf.B_),
    yPlusCrit_(ptf.yPlusCrit_),
    Cmu_(ptf.Cmu_),
    kappa_(ptf.kappa_),
    Prt_(ptf.Prt_)
{}
 
 
alphatFilmWallFunctionFvPatchScalarField::
alphatFilmWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const dictionary& dict
)
:
    fixedValueFvPatchScalarField(p, iF, dict),
    filmRegionName_
    (
        dict.getOrDefault<word>("filmRegion", "surfaceFilmProperties")
    ),
    B_(dict.getOrDefault("B", 5.5)),
    yPlusCrit_(dict.getOrDefault("yPlusCrit", 11.05)),
    Cmu_(dict.getOrDefault("Cmu", 0.09)),
    kappa_(dict.getOrDefault("kappa", 0.41)),
    Prt_(dict.getOrDefault("Prt", 0.85))
{}
 
 
alphatFilmWallFunctionFvPatchScalarField::
alphatFilmWallFunctionFvPatchScalarField
(
    const alphatFilmWallFunctionFvPatchScalarField& fwfpsf
)
:
    fixedValueFvPatchScalarField(fwfpsf),
    filmRegionName_(fwfpsf.filmRegionName_),
    B_(fwfpsf.B_),
    yPlusCrit_(fwfpsf.yPlusCrit_),
    Cmu_(fwfpsf.Cmu_),
    kappa_(fwfpsf.kappa_),
    Prt_(fwfpsf.Prt_)
{}
 
 
alphatFilmWallFunctionFvPatchScalarField::
alphatFilmWallFunctionFvPatchScalarField
(
    const alphatFilmWallFunctionFvPatchScalarField& fwfpsf,
    const DimensionedField<scalar, volMesh>& iF
)
:
    fixedValueFvPatchScalarField(fwfpsf, iF),
    filmRegionName_(fwfpsf.filmRegionName_),
    B_(fwfpsf.B_),
    yPlusCrit_(fwfpsf.yPlusCrit_),
    Cmu_(fwfpsf.Cmu_),
    kappa_(fwfpsf.kappa_),
    Prt_(fwfpsf.Prt_)
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
void alphatFilmWallFunctionFvPatchScalarField::updateCoeffs()
{
    if (updated())
    {
        return;
    }
 
    const auto* filmModelPtr = db().time().findObject
        <regionModels::surfaceFilmModels::surfaceFilmRegionModel>
        (filmRegionName_);
 
    if (!filmModelPtr)
    {
        // Do nothing on construction - film model doesn't exist yet
        return;
    }
 
    const auto& filmModel = *filmModelPtr;
 
 
    // 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;
 
    const label patchi = patch().index();
 
    // Retrieve phase change mass from surface film model
    const label filmPatchi = filmModel.regionPatchID(patchi);
 
    tmp<volScalarField> mDotFilm(filmModel.primaryMassTrans());
    scalarField mDotFilmp = mDotFilm().boundaryField()[filmPatchi];
    filmModel.toPrimary(filmPatchi, mDotFilmp);
 
    // Retrieve RAS turbulence model
    const turbulenceModel& turbModel = db().lookupObject<turbulenceModel>
    (
        IOobject::groupName
        (
            turbulenceModel::propertiesName,
            internalField().group()
        )
    );
 
    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 = turbModel.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);
    os.writeEntryIfDifferent<word>
    (
        "filmRegion",
        "surfaceFilmProperties",
        filmRegionName_
    );
    os.writeEntry("B", B_);
    os.writeEntry("yPlusCrit", yPlusCrit_);
    os.writeEntry("Cmu", Cmu_);
    os.writeEntry("kappa", kappa_);
    os.writeEntry("Prt", Prt_);
    writeEntry("value", os);
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
makePatchTypeField
(
    fvPatchScalarField,
    alphatFilmWallFunctionFvPatchScalarField
);
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace RASModels
} // End namespace compressible
} // End namespace Foam
 
// ************************************************************************* //