nutkFilmWallFunctionFvPatchScalarField.C

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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
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#include "nutkFilmWallFunctionFvPatchScalarField.H"
#include "fvPatchFieldMapper.H"
#include "volFields.H"
#include "turbulentFluidThermoModel.H"
#include "addToRunTimeSelectionTable.H"
#include "surfaceFilmModel.H"
#include "mappedWallPolyPatch.H"
#include "mapDistribute.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace compressible
{
namespace RASModels
{
 
// * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
 
tmp<scalarField> nutkFilmWallFunctionFvPatchScalarField::calcUTau
(
    const scalarField& magGradU
) const
{
    tmp<scalarField> tuTau(new scalarField(patch().size(), 0.0));
    scalarField& uTau = tuTau();
 
    typedef regionModels::surfaceFilmModels::surfaceFilmModel modelType;
 
    bool foundFilm = db().time().foundObject<modelType>(filmRegionName_);
 
    if (!foundFilm)
    {
        // do nothing on construction - film model doesn't exist yet
        return tuTau;
    }
 
    const label patchi = patch().index();
 
    // Retrieve phase change mass from surface film model
    const modelType& filmModel =
        db().time().lookupObject<modelType>(filmRegionName_);
 
    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,
            dimensionedInternalField().group()
        )
    );
 
    const scalarField& y = turbModel.y()[patchi];
    const tmp<volScalarField> tk = turbModel.k();
    const volScalarField& k = tk();
    const tmp<scalarField> tnuw = turbModel.nu(patchi);
    const scalarField& nuw = tnuw();
 
    const scalar Cmu25 = pow(Cmu_, 0.25);
 
    forAll(uTau, faceI)
    {
        label faceCellI = patch().faceCells()[faceI];
 
        scalar ut = Cmu25*sqrt(k[faceCellI]);
 
        scalar yPlus = y[faceI]*ut/nuw[faceI];
 
        scalar mStar = mDotFilmp[faceI]/(y[faceI]*ut);
 
        scalar factor = 0.0;
        if (yPlus > yPlusCrit_)
        {
            scalar expTerm = exp(min(50.0, B_*mStar));
            scalar powTerm = pow(yPlus, mStar/kappa_);
            factor = mStar/(expTerm*powTerm - 1.0 + ROOTVSMALL);
        }
        else
        {
            scalar expTerm = exp(min(50.0, mStar));
            factor = mStar/(expTerm*yPlus - 1.0 + ROOTVSMALL);
        }
 
        uTau[faceI] = sqrt(max(0, magGradU[faceI]*ut*factor));
    }
 
    return tuTau;
}
 
 
tmp<scalarField> nutkFilmWallFunctionFvPatchScalarField::calcNut() const
{
    const label patchi = patch().index();
 
    const turbulenceModel& turbModel = db().lookupObject<turbulenceModel>
    (
        IOobject::groupName
        (
            turbulenceModel::propertiesName,
            dimensionedInternalField().group()
        )
    );
 
    const fvPatchVectorField& Uw = turbModel.U().boundaryField()[patchi];
    const scalarField magGradU(mag(Uw.snGrad()));
    const tmp<scalarField> tnuw = turbModel.nu(patchi);
    const scalarField& nuw = tnuw();
 
    return max
    (
        scalar(0),
        sqr(calcUTau(magGradU))/(magGradU + ROOTVSMALL) - nuw
    );
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
nutkFilmWallFunctionFvPatchScalarField::nutkFilmWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF
)
:
    nutkWallFunctionFvPatchScalarField(p, iF),
    filmRegionName_("surfaceFilmProperties"),
    B_(5.5),
    yPlusCrit_(11.05)
{}
 
 
nutkFilmWallFunctionFvPatchScalarField::nutkFilmWallFunctionFvPatchScalarField
(
    const nutkFilmWallFunctionFvPatchScalarField& ptf,
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const fvPatchFieldMapper& mapper
)
:
    nutkWallFunctionFvPatchScalarField(ptf, p, iF, mapper),
    filmRegionName_(ptf.filmRegionName_),
    B_(5.5),
    yPlusCrit_(11.05)
{}
 
 
nutkFilmWallFunctionFvPatchScalarField::nutkFilmWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const dictionary& dict
)
:
    nutkWallFunctionFvPatchScalarField(p, iF, dict),
    filmRegionName_
    (
        dict.lookupOrDefault<word>("filmRegion", "surfaceFilmProperties")
    ),
    B_(dict.lookupOrDefault("B", 5.5)),
    yPlusCrit_(dict.lookupOrDefault("yPlusCrit", 11.05))
{}
 
 
nutkFilmWallFunctionFvPatchScalarField::nutkFilmWallFunctionFvPatchScalarField
(
    const nutkFilmWallFunctionFvPatchScalarField& wfpsf
)
:
    nutkWallFunctionFvPatchScalarField(wfpsf),
    filmRegionName_(wfpsf.filmRegionName_),
    B_(wfpsf.B_),
    yPlusCrit_(wfpsf.yPlusCrit_)
{}
 
 
nutkFilmWallFunctionFvPatchScalarField::nutkFilmWallFunctionFvPatchScalarField
(
    const nutkFilmWallFunctionFvPatchScalarField& wfpsf,
    const DimensionedField<scalar, volMesh>& iF
)
:
    nutkWallFunctionFvPatchScalarField(wfpsf, iF),
    filmRegionName_(wfpsf.filmRegionName_),
    B_(wfpsf.B_),
    yPlusCrit_(wfpsf.yPlusCrit_)
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
tmp<scalarField> nutkFilmWallFunctionFvPatchScalarField::yPlus() const
{
    const label patchi = patch().index();
 
    const turbulenceModel& turbModel = db().lookupObject<turbulenceModel>
    (
        IOobject::groupName
        (
            turbulenceModel::propertiesName,
            dimensionedInternalField().group()
        )
    );
 
    const scalarField& y = turbModel.y()[patchi];
    const fvPatchVectorField& Uw = turbModel.U().boundaryField()[patchi];
    const tmp<scalarField> tnuw = turbModel.nu(patchi);
    const scalarField& nuw = tnuw();
 
    return y*calcUTau(mag(Uw.snGrad()))/nuw;
}
 
 
void nutkFilmWallFunctionFvPatchScalarField::write(Ostream& os) const
{
    fvPatchField<scalar>::write(os);
    writeEntryIfDifferent<word>
    (
        os,
        "filmRegion",
        "surfaceFilmProperties",
        filmRegionName_
    );
    writeLocalEntries(os);
    os.writeKeyword("B") << B_ << token::END_STATEMENT << nl;
    os.writeKeyword("yPlusCrit") << yPlusCrit_ << token::END_STATEMENT << nl;
    writeEntry("value", os);
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
makePatchTypeField(fvPatchScalarField, nutkFilmWallFunctionFvPatchScalarField);
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace RASModels
} // End namespace compressible
} // End namespace Foam
 
// ************************************************************************* //