nutUSpaldingWallFunctionFvPatchScalarField.C

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#include "nutUSpaldingWallFunctionFvPatchScalarField.H"
#include "momentumTransportModel.H"
#include "fieldMapper.H"
#include "volFields.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
 
tmp<scalarField> nutUSpaldingWallFunctionFvPatchScalarField::nut() const
{
    const label patchi = patch().index();
 
    const momentumTransportModel& turbModel =
        db().lookupType<momentumTransportModel>(internalField().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
    );
}
 
 
tmp<scalarField> nutUSpaldingWallFunctionFvPatchScalarField::calcUTau
(
    const scalarField& magGradU
) const
{
    const label patchi = patch().index();
 
    const momentumTransportModel& turbModel =
        db().lookupType<momentumTransportModel>(internalField().group());
 
    const scalarField& y = turbModel.yb()[patchi];
 
    const fvPatchVectorField& Uw = turbModel.U().boundaryField()[patchi];
    const scalarField magUp(mag(Uw.patchInternalField() - Uw));
 
    const tmp<scalarField> tnuw = turbModel.nu(patchi);
    const scalarField& nuw = tnuw();
 
    const scalarField& nutw = *this;
 
    tmp<scalarField> tuTau(new scalarField(patch().size(), 0.0));
    scalarField& uTau = tuTau.ref();
 
    forAll(uTau, facei)
    {
        scalar ut = sqrt((nutw[facei] + nuw[facei])*magGradU[facei]);
 
        if (ut > rootVSmall)
        {
            int iter = 0;
            scalar err = great;
 
            do
            {
                scalar kUu = min(kappa_*magUp[facei]/ut, 50);
                scalar fkUu = exp(kUu) - 1 - kUu*(1 + 0.5*kUu);
 
                scalar f =
                    - ut*y[facei]/nuw[facei]
                    + magUp[facei]/ut
                    + 1/E_*(fkUu - 1.0/6.0*kUu*sqr(kUu));
 
                scalar df =
                    y[facei]/nuw[facei]
                  + magUp[facei]/sqr(ut)
                  + 1/E_*kUu*fkUu/ut;
 
                scalar uTauNew = ut + f/df;
                err = mag((ut - uTauNew)/ut);
                ut = uTauNew;
 
            } while (ut > rootVSmall && err > 0.01 && ++iter < 10);
 
            uTau[facei] = max(0.0, ut);
        }
    }
 
    return tuTau;
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
nutUSpaldingWallFunctionFvPatchScalarField::
nutUSpaldingWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const dictionary& dict
)
:
    nutWallFunctionFvPatchScalarField(p, iF, dict)
{}
 
 
nutUSpaldingWallFunctionFvPatchScalarField::
nutUSpaldingWallFunctionFvPatchScalarField
(
    const nutUSpaldingWallFunctionFvPatchScalarField& ptf,
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const fieldMapper& mapper
)
:
    nutWallFunctionFvPatchScalarField(ptf, p, iF, mapper)
{}
 
 
nutUSpaldingWallFunctionFvPatchScalarField::
nutUSpaldingWallFunctionFvPatchScalarField
(
    const nutUSpaldingWallFunctionFvPatchScalarField& wfpsf,
    const DimensionedField<scalar, volMesh>& iF
)
:
    nutWallFunctionFvPatchScalarField(wfpsf, iF)
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
tmp<scalarField> nutUSpaldingWallFunctionFvPatchScalarField::yPlus() const
{
    const label patchi = patch().index();
 
    const momentumTransportModel& turbModel =
        db().lookupType<momentumTransportModel>(internalField().group());
 
    const scalarField& y = turbModel.yb()[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 nutUSpaldingWallFunctionFvPatchScalarField::write(Ostream& os) const
{
    fvPatchField<scalar>::write(os);
    writeLocalEntries(os);
    writeEntry(os, "value", *this);
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
makePatchTypeField
(
    fvPatchScalarField,
    nutUSpaldingWallFunctionFvPatchScalarField
);
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// ************************************************************************* //