nutRoughWallFunctionFvPatchScalarField.C

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#include "nutRoughWallFunctionFvPatchScalarField.H"
#include <incompressibleRASModels/RASModel.H>
#include <finiteVolume/fvPatchFieldMapper.H>
#include <finiteVolume/volFields.H>
#include <OpenFOAM/addToRunTimeSelectionTable.H>

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

namespace Foam
{
namespace incompressible
{
namespace RASModels
{

// * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //

scalar nutRoughWallFunctionFvPatchScalarField::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))
        );
    }
    else
    {
        return (1.0 + Cs*KsPlus);
    }
}


tmp<scalarField> nutRoughWallFunctionFvPatchScalarField::calcNut() const
{
    const label patchI = patch().index();

    const RASModel& rasModel = db().lookupObject<RASModel>("RASProperties");
    const scalarField& y = rasModel.y()[patchI];
    const tmp<volScalarField> tk = rasModel.k();
    const volScalarField& k = tk();
    const scalarField& nuw = rasModel.nu().boundaryField()[patchI];

    const scalar Cmu25 = pow(Cmu_, 0.25);

    tmp<scalarField> tnutw(new scalarField(*this));
    scalarField& nutw = tnutw();

    forAll(nutw, faceI)
    {
        label faceCellI = patch().faceCells()[faceI];

        scalar uStar = Cmu25*sqrt(k[faceCellI]);
        scalar yPlus = uStar*y[faceI]/nuw[faceI];
        scalar KsPlus = uStar*Ks_[faceI]/nuw[faceI];

        scalar Edash = E_;

        if (KsPlus > 2.25)
        {
            Edash /= fnRough(KsPlus, Cs_[faceI]);
        }

        if (yPlus > yPlusLam_)
        {
            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;
}


// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

nutRoughWallFunctionFvPatchScalarField::nutRoughWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF
)
:
    nutWallFunctionFvPatchScalarField(p, iF),
    Ks_(p.size(), 0.0),
    Cs_(p.size(), 0.0)
{}


nutRoughWallFunctionFvPatchScalarField::nutRoughWallFunctionFvPatchScalarField
(
    const nutRoughWallFunctionFvPatchScalarField& ptf,
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const fvPatchFieldMapper& mapper
)
:
    nutWallFunctionFvPatchScalarField(ptf, p, iF, mapper),
    Ks_(ptf.Ks_, mapper),
    Cs_(ptf.Cs_, mapper)
{}


nutRoughWallFunctionFvPatchScalarField::nutRoughWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const dictionary& dict
)
:
    nutWallFunctionFvPatchScalarField(p, iF, dict),
    Ks_("Ks", dict, p.size()),
    Cs_("Cs", dict, p.size())
{}


nutRoughWallFunctionFvPatchScalarField::nutRoughWallFunctionFvPatchScalarField
(
    const nutRoughWallFunctionFvPatchScalarField& rwfpsf
)
:
    nutWallFunctionFvPatchScalarField(rwfpsf),
    Ks_(rwfpsf.Ks_),
    Cs_(rwfpsf.Cs_)
{}


nutRoughWallFunctionFvPatchScalarField::nutRoughWallFunctionFvPatchScalarField
(
    const nutRoughWallFunctionFvPatchScalarField& rwfpsf,
    const DimensionedField<scalar, volMesh>& iF
)
:
    nutWallFunctionFvPatchScalarField(rwfpsf, iF),
    Ks_(rwfpsf.Ks_),
    Cs_(rwfpsf.Cs_)
{}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

void nutRoughWallFunctionFvPatchScalarField::autoMap
(
    const fvPatchFieldMapper& m
)
{
    nutWallFunctionFvPatchScalarField::autoMap(m);
    Ks_.autoMap(m);
    Cs_.autoMap(m);
}


void nutRoughWallFunctionFvPatchScalarField::rmap
(
    const fvPatchScalarField& ptf,
    const labelList& addr
)
{
    nutWallFunctionFvPatchScalarField::rmap(ptf, addr);

    const nutRoughWallFunctionFvPatchScalarField& nrwfpsf =
        refCast<const nutRoughWallFunctionFvPatchScalarField>(ptf);

    Ks_.rmap(nrwfpsf.Ks_, addr);
    Cs_.rmap(nrwfpsf.Cs_, addr);
}


void nutRoughWallFunctionFvPatchScalarField::write(Ostream& os) const
{
    fvPatchField<scalar>::write(os);
    writeLocalEntries(os);
    Cs_.writeEntry("Cs", os);
    Ks_.writeEntry("Ks", os);
    writeEntry("value", os);
}


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

makePatchTypeField(fvPatchScalarField, nutRoughWallFunctionFvPatchScalarField);

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

} // End namespace RASModels
} // End namespace incompressible
} // End namespace Foam

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