nutkWallFunctionFvPatchScalarField.C

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    Copyright (C) 2019-2023 OpenCFD Ltd.
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#include "nutkWallFunctionFvPatchScalarField.H"
#include "turbulenceModel.H"
#include "fvPatchFieldMapper.H"
#include "volFields.H"
#include "wallFvPatch.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
 
Foam::tmp<Foam::scalarField> Foam::nutkWallFunctionFvPatchScalarField::
calcNut() const
{
    const label patchi = patch().index();
 
    const scalar Cmu25 = pow025(wallCoeffs_.Cmu());
    const scalar kappa = wallCoeffs_.kappa();
    const scalar E = wallCoeffs_.E();
    const scalar yPlusLam = wallCoeffs_.yPlusLam();
 
    const auto& turbModel = db().lookupObject<turbulenceModel>
    (
        IOobject::groupName
        (
            turbulenceModel::propertiesName,
            internalField().group()
        )
    );
 
    const labelUList& faceCells = patch().faceCells();
 
    const scalarField& y = turbModel.y()[patchi];
 
    const tmp<volScalarField> tk = turbModel.k();
    const volScalarField& k = tk();
 
    // Viscous sublayer contribution
    const tmp<scalarField> tnutVis = turbModel.nu(patchi);
    const scalarField& nutVis = tnutVis();
 
    // Calculate y-plus
    const auto yPlus = [&](const label facei) -> scalar
    {
        return (Cmu25*y[facei]*sqrt(k[faceCells[facei]])/nutVis[facei]);
    };
 
    // Inertial sublayer contribution
    const auto nutLog = [&](const label facei) -> scalar
    {
        const scalar yPlusFace = yPlus(facei);
        return
        (
            nutVis[facei]*yPlusFace*kappa
          / log(max(E*yPlusFace, 1 + 1e-4))
        );
    };
 
    auto tnutw = tmp<scalarField>::New(patch().size(), Zero);
    auto& nutw = tnutw.ref();
 
    switch (blender_)
    {
        case blenderType::STEPWISE:
        {
            forAll(nutw, facei)
            {
                if (yPlus(facei) > yPlusLam)
                {
                    nutw[facei] = nutLog(facei);
                }
                else
                {
                    nutw[facei] = nutVis[facei];
                }
            }
            break;
        }
 
        case blenderType::MAX:
        {
            forAll(nutw, facei)
            {
                // (PH:Eq. 27)
                nutw[facei] = max(nutVis[facei], nutLog(facei));
            }
            break;
        }
 
        case blenderType::BINOMIAL:
        {
            forAll(nutw, facei)
            {
                // (ME:Eqs. 15-16)
                nutw[facei] =
                    pow
                    (
                        pow(nutVis[facei], n_) + pow(nutLog(facei), n_),
                        scalar(1)/n_
                    );
            }
            break;
        }
 
        case blenderType::EXPONENTIAL:
        {
            forAll(nutw, facei)
            {
                // (PH:Eq. 31)
                const scalar yPlusFace = yPlus(facei);
                const scalar Gamma = 0.01*pow4(yPlusFace)/(1 + 5*yPlusFace);
                const scalar invGamma = scalar(1)/(Gamma + ROOTVSMALL);
 
                nutw[facei] =
                    nutVis[facei]*exp(-Gamma) + nutLog(facei)*exp(-invGamma);
            }
            break;
        }
 
        case blenderType::TANH:
        {
            forAll(nutw, facei)
            {
                // (KAS:Eqs. 33-34)
                const scalar nutLogFace = nutLog(facei);
                const scalar b1 = nutVis[facei] + nutLogFace;
                const scalar b2 =
                    pow
                    (
                        pow(nutVis[facei], 1.2) + pow(nutLogFace, 1.2),
                        1.0/1.2
                    );
                const scalar phiTanh = tanh(pow4(0.1*yPlus(facei)));
 
                nutw[facei] = phiTanh*b1 + (1 - phiTanh)*b2;
            }
            break;
        }
    }
 
    nutw -= nutVis;
 
    return tnutw;
}
 
 
void Foam::nutkWallFunctionFvPatchScalarField::writeLocalEntries
(
    Ostream& os
) const
{
    wallFunctionBlenders::writeEntries(os);
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::nutkWallFunctionFvPatchScalarField::nutkWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF
)
:
    nutWallFunctionFvPatchScalarField(p, iF),
    wallFunctionBlenders()
{}
 
 
Foam::nutkWallFunctionFvPatchScalarField::nutkWallFunctionFvPatchScalarField
(
    const nutkWallFunctionFvPatchScalarField& ptf,
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const fvPatchFieldMapper& mapper
)
:
    nutWallFunctionFvPatchScalarField(ptf, p, iF, mapper),
    wallFunctionBlenders(ptf)
{}
 
 
Foam::nutkWallFunctionFvPatchScalarField::nutkWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const dictionary& dict
)
:
    nutWallFunctionFvPatchScalarField(p, iF, dict),
    wallFunctionBlenders(dict, blenderType::STEPWISE, scalar(4))
{}
 
 
Foam::nutkWallFunctionFvPatchScalarField::nutkWallFunctionFvPatchScalarField
(
    const nutkWallFunctionFvPatchScalarField& wfpsf
)
:
    nutWallFunctionFvPatchScalarField(wfpsf),
    wallFunctionBlenders(wfpsf)
{}
 
 
Foam::nutkWallFunctionFvPatchScalarField::nutkWallFunctionFvPatchScalarField
(
    const nutkWallFunctionFvPatchScalarField& wfpsf,
    const DimensionedField<scalar, volMesh>& iF
)
:
    nutWallFunctionFvPatchScalarField(wfpsf, iF),
    wallFunctionBlenders(wfpsf)
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
Foam::tmp<Foam::scalarField> Foam::nutkWallFunctionFvPatchScalarField::
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<volScalarField> tk = turbModel.k();
    const volScalarField& k = tk();
    tmp<scalarField> tkwc = k.boundaryField()[patchi].patchInternalField();
    const scalarField& kwc = tkwc();
 
    tmp<scalarField> tnutVis = turbModel.nu(patchi);
    const scalarField& nutVis = tnutVis();
 
    tmp<scalarField> tnuEff = turbModel.nuEff(patchi);
    const scalarField& nuEff = tnuEff();
 
    const fvPatchVectorField& Uw = U(turbModel).boundaryField()[patchi];
    const scalarField magGradUw(mag(Uw.snGrad()));
 
    const scalar Cmu25 = pow025(wallCoeffs_.Cmu());
    const scalar yPlusLam = wallCoeffs_.yPlusLam();
 
    auto tyPlus = tmp<scalarField>::New(patch().size(), Zero);
    auto& yPlus = tyPlus.ref();
 
    forAll(yPlus, facei)
    {
        // inertial sublayer
        yPlus[facei] = Cmu25*y[facei]*sqrt(kwc[facei])/nutVis[facei];
 
        if (yPlusLam > yPlus[facei])
        {
            // viscous sublayer
            yPlus[facei] =
                y[facei]*sqrt(nuEff[facei]*magGradUw[facei])/nutVis[facei];
        }
    }
 
    return tyPlus;
}
 
 
void Foam::nutkWallFunctionFvPatchScalarField::write
(
    Ostream& os
) const
{
    nutWallFunctionFvPatchScalarField::write(os);
    writeLocalEntries(os);
    fvPatchField<scalar>::writeValueEntry(os);
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
    makePatchTypeField
    (
        fvPatchScalarField,
        nutkWallFunctionFvPatchScalarField
    );
}
 
 
// ************************************************************************* //