alphatJayatillekeWallFunctionFvPatchScalarField.C

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#include "alphatJayatillekeWallFunctionFvPatchScalarField.H"
#include "turbulenceModel.H"
#include "addToRunTimeSelectionTable.H"

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

namespace Foam
{
namespace incompressible
{

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

scalar alphatJayatillekeWallFunctionFvPatchScalarField::tolerance_ = 0.01;
label alphatJayatillekeWallFunctionFvPatchScalarField::maxIters_ = 10;

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

scalar alphatJayatillekeWallFunctionFvPatchScalarField::Psmooth
(
    const scalar Prat
) const
{
    return 9.24*(pow(Prat, 0.75) - 1.0)*(1.0 + 0.28*exp(-0.007*Prat));
}


scalar alphatJayatillekeWallFunctionFvPatchScalarField::yPlusTherm
(
    const nutWallFunctionFvPatchScalarField& nutw,
    const scalar P,
    const scalar Prat
) const
{
    scalar ypt = 11.0;

    for (int i=0; i<maxIters_; i++)
    {
        scalar f = ypt - (log(nutw.E()*ypt)/nutw.kappa() + P)/Prat;
        scalar df = 1.0 - 1.0/(ypt*nutw.kappa()*Prat);
        scalar yptNew = ypt - f/df;

        if (yptNew < vSmall)
        {
            return 0;
        }
        else if (mag(yptNew - ypt) < tolerance_)
        {
            return yptNew;
        }
        else
        {
            ypt = yptNew;
        }
     }

    return ypt;
}


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

alphatJayatillekeWallFunctionFvPatchScalarField::
alphatJayatillekeWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF
)
:
    fixedValueFvPatchScalarField(p, iF),
    Prt_(0.85)
{}


alphatJayatillekeWallFunctionFvPatchScalarField::
alphatJayatillekeWallFunctionFvPatchScalarField
(
    const alphatJayatillekeWallFunctionFvPatchScalarField& ptf,
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const fvPatchFieldMapper& mapper
)
:
    fixedValueFvPatchScalarField(ptf, p, iF, mapper),
    Prt_(ptf.Prt_)
{}


alphatJayatillekeWallFunctionFvPatchScalarField::
alphatJayatillekeWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const dictionary& dict
)
:
    fixedValueFvPatchScalarField(p, iF, dict),
    Prt_(readScalar(dict.lookup("Prt")))  // force read to avoid ambiguity
{}


alphatJayatillekeWallFunctionFvPatchScalarField::
alphatJayatillekeWallFunctionFvPatchScalarField
(
    const alphatJayatillekeWallFunctionFvPatchScalarField& wfpsf
)
:
    fixedValueFvPatchScalarField(wfpsf),
    Prt_(wfpsf.Prt_)
{}


alphatJayatillekeWallFunctionFvPatchScalarField::
alphatJayatillekeWallFunctionFvPatchScalarField
(
    const alphatJayatillekeWallFunctionFvPatchScalarField& wfpsf,
    const DimensionedField<scalar, volMesh>& iF
)
:
    fixedValueFvPatchScalarField(wfpsf, iF),
    Prt_(wfpsf.Prt_)
{}


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

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

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

    // Retrieve turbulence properties from model

    const turbulenceModel& turbModel = db().lookupObject<turbulenceModel>
    (
        IOobject::groupName
        (
            turbulenceModel::propertiesName,
            internalField().group()
        )
    );

    const nutWallFunctionFvPatchScalarField& nutw =
        nutWallFunctionFvPatchScalarField::nutw(turbModel, patchi);

    const scalar Cmu25 = pow(nutw.Cmu(), 0.25);
    const scalarField& y = turbModel.y()[patchi];
    const tmp<volScalarField> tnu = turbModel.nu();
    const volScalarField& nu = tnu();
    const scalarField& nuw = nu.boundaryField()[patchi];
    const tmp<volScalarField> tk = turbModel.k();
    const volScalarField& k = tk();

    const IOdictionary& transportProperties =
        db().lookupObject<IOdictionary>("transportProperties");

    // Molecular Prandtl number
    const scalar Pr
    (
        dimensionedScalar
        (
            "Pr",
            dimless,
            transportProperties.lookup("Pr")
        ).value()
    );

    // Populate boundary values
    scalarField& alphatw = *this;
    forAll(alphatw, facei)
    {
        const label celli = patch().faceCells()[facei];

        const scalar yPlus = Cmu25*sqrt(k[celli])*y[facei]/nuw[facei];

        // Molecular-to-turbulent Prandtl number ratio
        const scalar Prat = Pr/Prt_;

        // Thermal sublayer thickness
        const scalar P = Psmooth(Prat);
        const scalar yPlusTherm = this->yPlusTherm(nutw, P, Prat);

        // Update turbulent thermal conductivity
        if (yPlus > yPlusTherm)
        {
            const scalar nu = nuw[facei];
            const scalar kt =
                nu*(yPlus/(Prt_*(log(nutw.E()*yPlus)/nutw.kappa() + P)) - 1/Pr);

            alphatw[facei] = max(0.0, kt);
        }
        else
        {
            alphatw[facei] = 0.0;
        }
    }

    fixedValueFvPatchField<scalar>::updateCoeffs();
}


void alphatJayatillekeWallFunctionFvPatchScalarField::write(Ostream& os) const
{
    fvPatchField<scalar>::write(os);
    writeEntry(os, "Prt", Prt_);
    writeEntry(os, "value", *this);
}


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

makePatchTypeField
(
    fvPatchScalarField,
    alphatJayatillekeWallFunctionFvPatchScalarField
);

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

} // End namespace incompressible
} // End namespace Foam

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