Wall function for nuTilda

I created a wall function for nuTilda.

It calculates nuTilda on wall patch faces from mut calculated by mutWallFunction by following equation (the red part of nuTildaWallFunctionFvPatchScalarField.C).

nuTildaWallFunctionFvPatchScalarField.H
\*---------------------------------------------------------------------------*/

#ifndef compressiblenuTildaWallFunctionFvPatchScalarField_H
#define compressiblenuTildaWallFunctionFvPatchScalarField_H

#include "fixedValueFvPatchField.H"

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

namespace Foam
{
namespace compressible
{

class turbulenceModel;

/*---------------------------------------------------------------------------*\
             Class nuTildaWallFunctionFvPatchScalarField Declaration
\*---------------------------------------------------------------------------*/

class nuTildaWallFunctionFvPatchScalarField
:
    public fixedValueFvPatchField<scalar>
{
protected:

    // Protected data


    // Protected Member Functions

        //- Check the type of the patch
        virtual void checkType();

        //- Main driver to calculate the turbulence fields
        virtual tmp<scalarField> calcNuTilda() const;


public:

    //- Runtime type information
    TypeName("compressible::nuTildaWallFunction");


    // Constructors

        //- Construct from patch and internal field
        nuTildaWallFunctionFvPatchScalarField
        (
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&
        );

        //- Construct from patch, internal field and dictionary
        nuTildaWallFunctionFvPatchScalarField
        (
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&,
            const dictionary&
        );

        //- Construct by mapping given
        //  nuTildaWallFunctionFvPatchScalarField
        //  onto a new patch
        nuTildaWallFunctionFvPatchScalarField
        (
            const nuTildaWallFunctionFvPatchScalarField&,
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&,
            const fvPatchFieldMapper&
        );

        //- Construct as copy
        nuTildaWallFunctionFvPatchScalarField
        (
            const nuTildaWallFunctionFvPatchScalarField&
        );

        //- Construct and return a clone
        virtual tmp<fvPatchScalarField> clone() const
        {
            return tmp<fvPatchScalarField>
            (
                new nuTildaWallFunctionFvPatchScalarField(*this)
            );
        }

        //- Construct as copy setting internal field reference
        nuTildaWallFunctionFvPatchScalarField
        (
            const nuTildaWallFunctionFvPatchScalarField&,
            const DimensionedField<scalar, volMesh>&
        );

        //- Construct and return a clone setting internal field reference
        virtual tmp<fvPatchScalarField> clone
        (
            const DimensionedField<scalar, volMesh>& iF
        ) const
        {
            return tmp<fvPatchScalarField>
            (
                new nuTildaWallFunctionFvPatchScalarField(*this, iF)
            );
        }


    //- Destructor
    virtual ~nuTildaWallFunctionFvPatchScalarField()
    {}


    // Member functions


        // Evaluation functions

        //- Update the coefficients associated with the patch field
            virtual void updateCoeffs();
};


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

} // End namespace compressible
} // End namespace Foam

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

#endif

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

nuTildaWallFunctionFvPatchScalarField.C

\*---------------------------------------------------------------------------*/

#include "nuTildaWallFunctionFvPatchScalarField.H"

#include "compressible/turbulenceModel/turbulenceModel.H"

#include "fvPatchFieldMapper.H"

#include "fvMatrix.H"

#include "volFields.H"

#include "wallFvPatch.H"

#include "addToRunTimeSelectionTable.H"

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

namespace Foam

{

namespace compressible

{

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

//defineTypeNameAndDebug(nuTildaWallFunctionFvPatchScalarField, 0);

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

void nuTildaWallFunctionFvPatchScalarField::checkType()

{

    if (!isA<wallFvPatch>(patch()))

    {

        FatalErrorIn("nuTildaWallFunctionFvPatchScalarField::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);

    }

}

tmp<scalarField> nuTildaWallFunctionFvPatchScalarField::calcNuTilda() const

{

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

    const turbulenceModel& turbModel =

        db().lookupObject<turbulenceModel>("turbulenceModel");

    

    const fvPatchScalarField& muw = turbModel.mu().boundaryField()[patchi];

    const volScalarField& mut = db().lookupObject<volScalarField>("mut");

    const fvPatchScalarField& mutw = mut.boundaryField()[patchi];

    const fvPatchScalarField& rhow = turbModel.rho().boundaryField()[patchi];

    tmp<scalarField> tnuTildaw(new scalarField(patch().size(), 0.0));

    scalarField& nuTildaw = tnuTildaw();

    forAll(mutw, faceI)

    {

        scalar nu = muw[faceI]/rhow[faceI];

        scalar nut = mutw[faceI]/rhow[faceI];

        scalar nT = nut;

        int iter = 0;

        scalar nuTildaLast = 0.0;

        do

        {

            nuTildaLast = nT;

            nT = pow(pow3(nu)*(pow3(nT/nu) + pow3(7.1))*nut, 0.25);

        } while (mag((nT - nuTildaLast)/max(nT, 1.0e-10)) > 0.01 && ++iter < 100);

        nuTildaw[faceI] = max(0.0, nT);

    }

    return tnuTildaw;

}

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

nuTildaWallFunctionFvPatchScalarField::nuTildaWallFunctionFvPatchScalarField

(

    const fvPatch& p,

    const DimensionedField<scalar, volMesh>& iF

)

:

    fixedValueFvPatchField<scalar>(p, iF)

{

    checkType();

}

nuTildaWallFunctionFvPatchScalarField::nuTildaWallFunctionFvPatchScalarField

(

    const nuTildaWallFunctionFvPatchScalarField& ptf,

    const fvPatch& p,

    const DimensionedField<scalar, volMesh>& iF,

    const fvPatchFieldMapper& mapper

)

:

    fixedValueFvPatchField<scalar>(ptf, p, iF, mapper)

{

    checkType();

}

nuTildaWallFunctionFvPatchScalarField::nuTildaWallFunctionFvPatchScalarField

(

    const fvPatch& p,

    const DimensionedField<scalar, volMesh>& iF,

    const dictionary& dict

)

:

    fixedValueFvPatchField<scalar>(p, iF, dict)

{

    checkType();

}

nuTildaWallFunctionFvPatchScalarField::nuTildaWallFunctionFvPatchScalarField

(

    const nuTildaWallFunctionFvPatchScalarField& wfpsf

)

:

    fixedValueFvPatchField<scalar>(wfpsf)

{

    checkType();

}

nuTildaWallFunctionFvPatchScalarField::nuTildaWallFunctionFvPatchScalarField

(

    const nuTildaWallFunctionFvPatchScalarField& wfpsf,

    const DimensionedField<scalar, volMesh>& iF

)

:

    fixedValueFvPatchField<scalar>(wfpsf, iF)

{

    checkType();

}

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

void nuTildaWallFunctionFvPatchScalarField::updateCoeffs()

{

    if (updated())

    {

        return;

    }

    operator==(calcNuTilda());

    fixedValueFvPatchField<scalar>::updateCoeffs();

}

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

makePatchTypeField

(

    fvPatchScalarField,

    nuTildaWallFunctionFvPatchScalarField

);

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

} // End namespace compressible

} // End namespace Foam

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