kLowReWallFunctionFvPatchScalarField.C

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#include "kLowReWallFunctionFvPatchScalarField.H"
#include "nutWallFunctionFvPatchScalarField.H"
#include "momentumTransportModel.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
kLowReWallFunctionFvPatchScalarField::kLowReWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const dictionary& dict
)
:
    fixedValueFvPatchField<scalar>(p, iF, dict),
    Ceps2_(dict.lookupOrDefault<scalar>("Ceps2", dimless, 1.9))
{}
 
 
kLowReWallFunctionFvPatchScalarField::kLowReWallFunctionFvPatchScalarField
(
    const kLowReWallFunctionFvPatchScalarField& ptf,
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const fieldMapper& mapper
)
:
    fixedValueFvPatchField<scalar>(ptf, p, iF, mapper),
    Ceps2_(ptf.Ceps2_)
{}
 
 
kLowReWallFunctionFvPatchScalarField::kLowReWallFunctionFvPatchScalarField
(
    const kLowReWallFunctionFvPatchScalarField& kwfpsf,
    const DimensionedField<scalar, volMesh>& iF
)
:
    fixedValueFvPatchField<scalar>(kwfpsf, iF),
    Ceps2_(kwfpsf.Ceps2_)
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
void kLowReWallFunctionFvPatchScalarField::updateCoeffs()
{
    if (updated())
    {
        return;
    }
 
    const label patchi = patch().index();
 
    const momentumTransportModel& turbModel =
        db().lookupType<momentumTransportModel>(internalField().group());
 
    const nutWallFunctionFvPatchScalarField& nutw =
        nutWallFunctionFvPatchScalarField::nutw(turbModel, patchi);
 
    const scalarField& y = turbModel.yb()[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 = pow025(nutw.Cmu());
 
    scalarField& kw = *this;
 
    // Set k wall values
    forAll(kw, facei)
    {
        label celli = patch().faceCells()[facei];
 
        scalar uTau = Cmu25*sqrt(k[celli]);
 
        scalar yPlus = uTau*y[facei]/nuw[facei];
 
        if (yPlus > nutw.yPlusLam())
        {
            scalar Ck = -0.416;
            scalar Bk = 8.366;
            kw[facei] = Ck/nutw.kappa()*log(yPlus) + Bk;
        }
        else
        {
            scalar C = 11.0;
            scalar Cf = (1.0/sqr(yPlus + C) + 2.0*yPlus/pow3(C) - 1.0/sqr(C));
            kw[facei] = 2400.0/sqr(Ceps2_)*Cf;
        }
 
        kw[facei] *= sqr(uTau);
    }
 
    // Limit kw to avoid failure of the turbulence model due to division by kw
    kw = max(kw, small);
 
    fixedValueFvPatchField<scalar>::updateCoeffs();
 
    // TODO: perform averaging for cells sharing more than one boundary face
}
 
 
void kLowReWallFunctionFvPatchScalarField::write(Ostream& os) const
{
    writeEntry(os, "Ceps2", Ceps2_);
    fixedValueFvPatchField<scalar>::write(os);
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
makePatchTypeField
(
    fvPatchScalarField,
    kLowReWallFunctionFvPatchScalarField
);
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// ************************************************************************* //