nutUWallFunctionFvPatchScalarField.C

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    Copyright (C) 2019-2021 OpenCFD Ltd.
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#include "nutUWallFunctionFvPatchScalarField.H"
#include "turbulenceModel.H"
#include "fvPatchFieldMapper.H"
#include "volFields.H"
#include "addToRunTimeSelectionTable.H"
 
 
// * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
 
Foam::tmp<Foam::scalarField>
Foam::nutUWallFunctionFvPatchScalarField::calcNut() const
{
    const label patchi = patch().index();
 
    const turbulenceModel& turbModel = db().lookupObject<turbulenceModel>
    (
        IOobject::groupName
        (
            turbulenceModel::propertiesName,
            internalField().group()
        )
    );
    const fvPatchVectorField& Uw = U(turbModel).boundaryField()[patchi];
    const scalarField magUp(mag(Uw.patchInternalField() - Uw));
    const tmp<scalarField> tnuw = turbModel.nu(patchi);
    const scalarField& nuw = tnuw();
 
    tmp<scalarField> tyPlus = calcYPlus(magUp);
    const scalarField& yPlus = tyPlus();
 
    tmp<scalarField> tnutw(new scalarField(patch().size(), Zero));
    scalarField& nutw = tnutw.ref();
 
    forAll(yPlus, facei)
    {
        // Viscous sublayer contribution
        const scalar nutVis = 0.0;
 
        // Inertial sublayer contribution
        const scalar nutLog =
            nuw[facei]
           *(yPlus[facei]*kappa_/log(max(E_*yPlus[facei], 1 + 1e-4)) - 1.0);
 
        nutw[facei] = blend(nutVis, nutLog, yPlus[facei]);
    }
 
    return tnutw;
}
 
 
Foam::tmp<Foam::scalarField>
Foam::nutUWallFunctionFvPatchScalarField::calcYPlus
(
    const scalarField& magUp
) const
{
    const label patchi = patch().index();
 
    const turbulenceModel& turbModel = db().lookupObject<turbulenceModel>
    (
        IOobject::groupName
        (
            turbulenceModel::propertiesName,
            internalField().group()
        )
    );
    const scalarField& y = turbModel.y()[patchi];
    const tmp<scalarField> tnuw = turbModel.nu(patchi);
    const scalarField& nuw = tnuw();
 
    tmp<scalarField> tyPlus(new scalarField(patch().size(), Zero));
    scalarField& yPlus = tyPlus.ref();
 
    forAll(yPlus, facei)
    {
        const scalar kappaRe = kappa_*magUp[facei]*y[facei]/nuw[facei];
 
        scalar yp = yPlusLam_;
        const scalar ryPlusLam = 1.0/yp;
 
        int iter = 0;
        scalar yPlusLast = 0.0;
 
        do
        {
            yPlusLast = yp;
            yp = (kappaRe + yp)/(1.0 + log(E_*yp));
 
        } while (mag(ryPlusLam*(yp - yPlusLast)) > 0.01 && ++iter < 10 );
 
        yPlus[facei] = max(0.0, yp);
    }
 
    return tyPlus;
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::nutUWallFunctionFvPatchScalarField::nutUWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF
)
:
    nutWallFunctionFvPatchScalarField(p, iF)
{}
 
 
Foam::nutUWallFunctionFvPatchScalarField::nutUWallFunctionFvPatchScalarField
(
    const nutUWallFunctionFvPatchScalarField& ptf,
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const fvPatchFieldMapper& mapper
)
:
    nutWallFunctionFvPatchScalarField(ptf, p, iF, mapper)
{}
 
 
Foam::nutUWallFunctionFvPatchScalarField::nutUWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const dictionary& dict
)
:
    nutWallFunctionFvPatchScalarField(p, iF, dict)
{}
 
 
Foam::nutUWallFunctionFvPatchScalarField::nutUWallFunctionFvPatchScalarField
(
    const nutUWallFunctionFvPatchScalarField& sawfpsf
)
:
    nutWallFunctionFvPatchScalarField(sawfpsf)
{}
 
 
Foam::nutUWallFunctionFvPatchScalarField::nutUWallFunctionFvPatchScalarField
(
    const nutUWallFunctionFvPatchScalarField& sawfpsf,
    const DimensionedField<scalar, volMesh>& iF
)
:
    nutWallFunctionFvPatchScalarField(sawfpsf, iF)
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
Foam::tmp<Foam::scalarField>
Foam::nutUWallFunctionFvPatchScalarField::yPlus() const
{
    const label patchi = patch().index();
 
    const auto& turbModel = db().lookupObject<turbulenceModel>
    (
        IOobject::groupName
        (
            turbulenceModel::propertiesName,
            internalField().group()
        )
    );
 
    const scalarField& y = turbModel.y()[patchi];
 
    tmp<scalarField> tnuw = turbModel.nu(patchi);
    const scalarField& nuw = tnuw();
 
    tmp<scalarField> tnuEff = turbModel.nuEff(patchi);
    const scalarField& nuEff = tnuEff();
 
    const fvPatchVectorField& Uw = U(turbModel).boundaryField()[patchi];
    const scalarField magUp(mag(Uw.patchInternalField() - Uw));
    const scalarField magGradUw(mag(Uw.snGrad()));
 
    tmp<scalarField> tyPlus = calcYPlus(magUp);
    scalarField& yPlus = tyPlus.ref();
 
    forAll(yPlus, facei)
    {
        if (yPlusLam_ > yPlus[facei])
        {
            // viscous sublayer
            yPlus[facei] =
                y[facei]*sqrt(nuEff[facei]*magGradUw[facei])/nuw[facei];
        }
    }
 
    return tyPlus;
}
 
 
void Foam::nutUWallFunctionFvPatchScalarField::write
(
    Ostream& os
) const
{
    fvPatchField<scalar>::write(os);
    writeLocalEntries(os);
    writeEntry("value", os);
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
    makePatchTypeField
    (
        fvPatchScalarField,
        nutUWallFunctionFvPatchScalarField
    );
}
 
 
// ************************************************************************* //