nutkRoughWallFunctionFvPatchScalarField.C

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    Copyright (C) 2019-2022 OpenCFD Ltd.
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#include "nutkRoughWallFunctionFvPatchScalarField.H"
#include "turbulenceModel.H"
#include "fvPatchFieldMapper.H"
#include "volFields.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
 
Foam::scalar Foam::nutkRoughWallFunctionFvPatchScalarField::fnRough
(
    const scalar KsPlus,
    const scalar Cs
) const
{
    // Return fn based on non-dimensional roughness height
 
    if (KsPlus < 90.0)
    {
        return pow
        (
            (KsPlus - 2.25)/87.75 + Cs*KsPlus,
            sin(0.4258*(log(KsPlus) - 0.811))
        );
    }
 
    return (1.0 + Cs*KsPlus);
}
 
 
Foam::tmp<Foam::scalarField> Foam::nutkRoughWallFunctionFvPatchScalarField::
calcNut() const
{
    const label patchi = patch().index();
 
    const auto& turbModel = db().lookupObject<turbulenceModel>
    (
        IOobject::groupName
        (
            turbulenceModel::propertiesName,
            internalField().group()
        )
    );
 
    const scalarField& y = turbModel.y()[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(wallCoeffs_.Cmu());
    const scalar kappa = wallCoeffs_.kappa();
    const scalar E = wallCoeffs_.E();
 
    auto tnutw = tmp<scalarField>::New(*this);
    auto& nutw = tnutw.ref();
 
    forAll(nutw, facei)
    {
        const label celli = patch().faceCells()[facei];
 
        const scalar uStar = Cmu25*sqrt(k[celli]);
        const scalar yPlus = uStar*y[facei]/nuw[facei];
        const scalar KsPlus = uStar*Ks_[facei]/nuw[facei];
 
        scalar Edash = E;
        if (2.25 < KsPlus)
        {
            Edash /= fnRough(KsPlus, Cs_[facei]);
        }
 
        const scalar limitingNutw = max(nutw[facei], nuw[facei]);
 
        // To avoid oscillations limit the change in the wall viscosity
        // which is particularly important if it temporarily becomes zero
        nutw[facei] =
            max
            (
                min
                (
                    nuw[facei]
                   *(yPlus*kappa/log(max(Edash*yPlus, 1+1e-4)) - 1),
                    2*limitingNutw
                ), 0.5*limitingNutw
            );
 
        if (debug)
        {
            Info<< "yPlus = " << yPlus
                << ", KsPlus = " << KsPlus
                << ", Edash = " << Edash
                << ", nutw = " << nutw[facei]
                << endl;
        }
    }
 
    return tnutw;
}
 
 
void Foam::nutkRoughWallFunctionFvPatchScalarField::writeLocalEntries
(
    Ostream& os
) const
{
    Cs_.writeEntry("Cs", os);
    Ks_.writeEntry("Ks", os);
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::nutkRoughWallFunctionFvPatchScalarField::
nutkRoughWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF
)
:
    nutkWallFunctionFvPatchScalarField(p, iF),
    Ks_(p.size(), Zero),
    Cs_(p.size(), Zero)
{}
 
 
Foam::nutkRoughWallFunctionFvPatchScalarField::
nutkRoughWallFunctionFvPatchScalarField
(
    const nutkRoughWallFunctionFvPatchScalarField& ptf,
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const fvPatchFieldMapper& mapper
)
:
    nutkWallFunctionFvPatchScalarField(ptf, p, iF, mapper),
    Ks_(ptf.Ks_, mapper),
    Cs_(ptf.Cs_, mapper)
{}
 
 
Foam::nutkRoughWallFunctionFvPatchScalarField::
nutkRoughWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const dictionary& dict
)
:
    nutkWallFunctionFvPatchScalarField(p, iF, dict),
    Ks_("Ks", dict, p.size()),
    Cs_("Cs", dict, p.size())
{}
 
 
Foam::nutkRoughWallFunctionFvPatchScalarField::
nutkRoughWallFunctionFvPatchScalarField
(
    const nutkRoughWallFunctionFvPatchScalarField& rwfpsf
)
:
    nutkWallFunctionFvPatchScalarField(rwfpsf),
    Ks_(rwfpsf.Ks_),
    Cs_(rwfpsf.Cs_)
{}
 
 
Foam::nutkRoughWallFunctionFvPatchScalarField::
nutkRoughWallFunctionFvPatchScalarField
(
    const nutkRoughWallFunctionFvPatchScalarField& rwfpsf,
    const DimensionedField<scalar, volMesh>& iF
)
:
    nutkWallFunctionFvPatchScalarField(rwfpsf, iF),
    Ks_(rwfpsf.Ks_),
    Cs_(rwfpsf.Cs_)
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
void Foam::nutkRoughWallFunctionFvPatchScalarField::autoMap
(
    const fvPatchFieldMapper& m
)
{
    nutkWallFunctionFvPatchScalarField::autoMap(m);
    Ks_.autoMap(m);
    Cs_.autoMap(m);
}
 
 
void Foam::nutkRoughWallFunctionFvPatchScalarField::rmap
(
    const fvPatchScalarField& ptf,
    const labelList& addr
)
{
    nutkWallFunctionFvPatchScalarField::rmap(ptf, addr);
 
    const auto& nrwfpsf =
        refCast<const nutkRoughWallFunctionFvPatchScalarField>(ptf);
 
    Ks_.rmap(nrwfpsf.Ks_, addr);
    Cs_.rmap(nrwfpsf.Cs_, addr);
}
 
 
void Foam::nutkRoughWallFunctionFvPatchScalarField::write
(
    Ostream& os
) const
{
    nutWallFunctionFvPatchScalarField::write(os);
    writeLocalEntries(os);
    writeEntry("value", os);
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
    makePatchTypeField
    (
        fvPatchScalarField,
        nutkRoughWallFunctionFvPatchScalarField
    );
}
 
// ************************************************************************* //