nutUWallFunctionFvPatchScalarField.C

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    Copyright (C) 2019-2021 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.

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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
    );
}


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