kLowReWallFunctionFvPatchScalarField.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2012-2015 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
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#include "kLowReWallFunctionFvPatchScalarField.H"
#include "turbulenceModel.H"
#include "fvPatchFieldMapper.H"
#include "volFields.H"
#include "addToRunTimeSelectionTable.H"
#include "wallFvPatch.H"

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

namespace Foam
{

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

void kLowReWallFunctionFvPatchScalarField::checkType()
{
    if (!isA<wallFvPatch>(patch()))
    {
        FatalErrorIn("kLowReWallFunctionFvPatchScalarField::checkType()")
            << "Invalid wall function specification" << nl
            << "    Patch type for patch " << patch().name()
            << " must be wall" << nl
            << "    Current patch type is " << patch().type() << nl << endl
            << abort(FatalError);
    }
}


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

scalar kLowReWallFunctionFvPatchScalarField::yPlusLam
(
    const scalar kappa,
    const scalar E
)
{
    scalar ypl = 11.0;

    for (int i=0; i<10; i++)
    {
        ypl = log(max(E*ypl, 1))/kappa;
    }

    return ypl;
}


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

kLowReWallFunctionFvPatchScalarField::kLowReWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF
)
:
    fixedValueFvPatchField<scalar>(p, iF),
    Cmu_(0.09),
    kappa_(0.41),
    E_(9.8),
    Ceps2_(1.9),
    yPlusLam_(yPlusLam(kappa_, E_))
{
    checkType();
}


kLowReWallFunctionFvPatchScalarField::kLowReWallFunctionFvPatchScalarField
(
    const kLowReWallFunctionFvPatchScalarField& ptf,
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const fvPatchFieldMapper& mapper
)
:
    fixedValueFvPatchField<scalar>(ptf, p, iF, mapper),
    Cmu_(ptf.Cmu_),
    kappa_(ptf.kappa_),
    E_(ptf.E_),
    Ceps2_(ptf.Ceps2_),
    yPlusLam_(ptf.yPlusLam_)
{
    checkType();
}


kLowReWallFunctionFvPatchScalarField::kLowReWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const dictionary& dict
)
:
    fixedValueFvPatchField<scalar>(p, iF, dict),
    Cmu_(dict.lookupOrDefault<scalar>("Cmu", 0.09)),
    kappa_(dict.lookupOrDefault<scalar>("kappa", 0.41)),
    E_(dict.lookupOrDefault<scalar>("E", 9.8)),
    Ceps2_(dict.lookupOrDefault<scalar>("Ceps2", 1.9)),
    yPlusLam_(yPlusLam(kappa_, E_))
{
    checkType();
}


kLowReWallFunctionFvPatchScalarField::kLowReWallFunctionFvPatchScalarField
(
    const kLowReWallFunctionFvPatchScalarField& kwfpsf
)
:
    fixedValueFvPatchField<scalar>(kwfpsf),
    Cmu_(kwfpsf.Cmu_),
    kappa_(kwfpsf.kappa_),
    E_(kwfpsf.E_),
    Ceps2_(kwfpsf.Ceps2_),
    yPlusLam_(kwfpsf.yPlusLam_)
{
    checkType();
}


kLowReWallFunctionFvPatchScalarField::kLowReWallFunctionFvPatchScalarField
(
    const kLowReWallFunctionFvPatchScalarField& kwfpsf,
    const DimensionedField<scalar, volMesh>& iF
)
:
    fixedValueFvPatchField<scalar>(kwfpsf, iF),
    Cmu_(kwfpsf.Cmu_),
    kappa_(kwfpsf.kappa_),
    E_(kwfpsf.E_),
    Ceps2_(kwfpsf.Ceps2_),
    yPlusLam_(kwfpsf.yPlusLam_)
{
    checkType();
}


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

void kLowReWallFunctionFvPatchScalarField::updateCoeffs()
{
    if (updated())
    {
        return;
    }

    const label patchi = patch().index();

    const turbulenceModel& turbModel = db().lookupObject<turbulenceModel>
    (
        IOobject::groupName
        (
            turbulenceModel::propertiesName,
            dimensionedInternalField().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(Cmu_);

    scalarField& kw = *this;

    // Set k wall values
    forAll(kw, faceI)
    {
        label faceCellI = patch().faceCells()[faceI];

        scalar uTau = Cmu25*sqrt(k[faceCellI]);

        scalar yPlus = uTau*y[faceI]/nuw[faceI];

        if (yPlus > yPlusLam_)
        {
            scalar Ck = -0.416;
            scalar Bk = 8.366;
            kw[faceI] = Ck/kappa_*log(yPlus) + Bk;
        }
        else
        {
            scalar C = 11.0;
            scalar Cf = (1.0/sqr(yPlus + C) + 2.0*yPlus/pow3(C) - 1.0/sqr(C));
            kw[faceI] = 2400.0/sqr(Ceps2_)*Cf;
        }

        kw[faceI] *= sqr(uTau);
    }

    // Limit kw to avoid failure of the turbulence model due to division by kw
    kw = max(kw, SMALL);

    fixedValueFvPatchField<scalar>::updateCoeffs();

    // TODO: perform averaging for cells sharing more than one boundary face
}


void kLowReWallFunctionFvPatchScalarField::evaluate
(
    const Pstream::commsTypes commsType
)
{
    fixedValueFvPatchField<scalar>::evaluate(commsType);
}


void kLowReWallFunctionFvPatchScalarField::write(Ostream& os) const
{
    os.writeKeyword("Cmu") << Cmu_ << token::END_STATEMENT << nl;
    os.writeKeyword("kappa") << kappa_ << token::END_STATEMENT << nl;
    os.writeKeyword("E") << E_ << token::END_STATEMENT << nl;
    os.writeKeyword("Ceps2") << Ceps2_ << token::END_STATEMENT << nl;
    fixedValueFvPatchField<scalar>::write(os);
}


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

makePatchTypeField
(
    fvPatchScalarField,
    kLowReWallFunctionFvPatchScalarField
);

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

} // End namespace Foam

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