added RAS variant of the Jayatilleke thermal wall function

src/turbulenceModels/compressible/RAS/Make/files

@@ -15,6 +15,7 @@ wallFunctions = derivedFvPatchFields/wallFunctions
 
 alphatWallFunctions = $(wallFunctions)/alphatWallFunctions
 $(alphatWallFunctions)/alphatWallFunction/alphatWallFunctionFvPatchScalarField.C
+$(alphatWallFunctions)/alphatJayatillekeWallFunction/alphatJayatillekeWallFunctionFvPatchScalarField.C
 
 mutWallFunctions = $(wallFunctions)/mutWallFunctions
 $(mutWallFunctions)/mutkRoughWallFunction/mutkRoughWallFunctionFvPatchScalarField.C

src/turbulenceModels/compressible/RAS/derivedFvPatchFields/wallFunctions/alphatWallFunctions/alphatJayatillekeWallFunction/alphatJayatillekeWallFunctionFvPatchScalarField.C

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2008-2009 OpenCFD Ltd.
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software; you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by the
+    Free Software Foundation; either version 2 of the License, or (at your
+    option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM; if not, write to the Free Software Foundation,
+    Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+\*---------------------------------------------------------------------------*/
+
+#include "alphatJayatillekeWallFunctionFvPatchScalarField.H"
+#include "RASModel.H"
+#include "fvPatchFieldMapper.H"
+#include "volFields.H"
+#include "addToRunTimeSelectionTable.H"
+#include "wallFvPatch.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+namespace compressible
+{
+namespace RASModels
+{
+
+// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
+
+scalar alphatJayatillekeWallFunctionFvPatchScalarField::maxExp_ = 50.0;
+scalar alphatJayatillekeWallFunctionFvPatchScalarField::tolerance_ = 0.01;
+label alphatJayatillekeWallFunctionFvPatchScalarField::maxIters_ = 10;
+
+// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
+
+void alphatJayatillekeWallFunctionFvPatchScalarField::checkType()
+{
+    if (!isA<wallFvPatch>(patch()))
+    {
+        FatalErrorIn
+        (
+            "alphatJayatillekeWallFunctionFvPatchScalarField::checkType()"
+        )
+            << "Patch type for patch " << patch().name() << " must be wall\n"
+            << "Current patch type is " << patch().type() << nl
+            << exit(FatalError);
+    }
+}
+
+
+scalar alphatJayatillekeWallFunctionFvPatchScalarField::Psmooth
+(
+    const scalar Prat
+) const
+{
+    return 9.24*(pow(Prat, 0.75) - 1.0)*(1.0 + 0.28*exp(-0.007*Prat));
+}
+
+
+scalar alphatJayatillekeWallFunctionFvPatchScalarField::yPlusTherm
+(
+    const scalar P,
+    const scalar Prat
+) const
+{
+    scalar ypt = 11.0;
+
+    for (int i=0; i<maxIters_; i++)
+    {
+        scalar f = ypt - (log(E_*ypt)/kappa_ + P)/Prat;
+        scalar df = 1.0 - 1.0/(ypt*kappa_*Prat);
+        scalar yptNew = ypt - f/df;
+
+        if (yptNew < VSMALL)
+        {
+            return 0;
+        }
+        else if (mag(yptNew - ypt) < tolerance_)
+        {
+            return yptNew;
+        }
+        else
+        {
+            ypt = yptNew;
+        }
+     }
+
+    return ypt;
+}
+
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+alphatJayatillekeWallFunctionFvPatchScalarField::
+alphatJayatillekeWallFunctionFvPatchScalarField
+(
+    const fvPatch& p,
+    const DimensionedField<scalar, volMesh>& iF
+)
+:
+    fixedValueFvPatchScalarField(p, iF),
+    Prt_(0.85),
+    Cmu_(0.09),
+    kappa_(0.41),
+    E_(9.8)
+{
+    checkType();
+}
+
+
+alphatJayatillekeWallFunctionFvPatchScalarField::
+alphatJayatillekeWallFunctionFvPatchScalarField
+(
+    const alphatJayatillekeWallFunctionFvPatchScalarField& ptf,
+    const fvPatch& p,
+    const DimensionedField<scalar, volMesh>& iF,
+    const fvPatchFieldMapper& mapper
+)
+:
+    fixedValueFvPatchScalarField(ptf, p, iF, mapper),
+    Prt_(ptf.Prt_),
+    Cmu_(ptf.Cmu_),
+    kappa_(ptf.kappa_),
+    E_(ptf.E_)
+{}
+
+
+alphatJayatillekeWallFunctionFvPatchScalarField::
+alphatJayatillekeWallFunctionFvPatchScalarField
+(
+    const fvPatch& p,
+    const DimensionedField<scalar, volMesh>& iF,
+    const dictionary& dict
+)
+:
+    fixedValueFvPatchScalarField(p, iF, dict),
+    Prt_(dict.lookupOrDefault<scalar>("Prt", 0.85)),
+    Cmu_(dict.lookupOrDefault<scalar>("Cmu", 0.09)),
+    kappa_(dict.lookupOrDefault<scalar>("kappa", 0.41)),
+    E_(dict.lookupOrDefault<scalar>("E", 9.8))
+{
+    checkType();
+}
+
+
+alphatJayatillekeWallFunctionFvPatchScalarField::
+alphatJayatillekeWallFunctionFvPatchScalarField
+(
+    const alphatJayatillekeWallFunctionFvPatchScalarField& awfpsf
+)
+:
+    fixedValueFvPatchScalarField(awfpsf),
+    Prt_(awfpsf.Prt_),
+    Cmu_(awfpsf.Cmu_),
+    kappa_(awfpsf.kappa_),
+    E_(awfpsf.E_)
+{
+    checkType();
+}
+
+
+alphatJayatillekeWallFunctionFvPatchScalarField::
+alphatJayatillekeWallFunctionFvPatchScalarField
+(
+    const alphatJayatillekeWallFunctionFvPatchScalarField& awfpsf,
+    const DimensionedField<scalar, volMesh>& iF
+)
+:
+    fixedValueFvPatchScalarField(awfpsf, iF),
+    Prt_(awfpsf.Prt_),
+    Cmu_(awfpsf.Cmu_),
+    kappa_(awfpsf.kappa_),
+    E_(awfpsf.E_)
+{
+    checkType();
+}
+
+
+// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
+
+void alphatJayatillekeWallFunctionFvPatchScalarField::updateCoeffs()
+{
+    if (updated())
+    {
+        return;
+    }
+
+    const label patchI = patch().index();
+
+    const RASModel& rasModel = db().lookupObject<RASModel>("RASProperties");
+
+    const scalar Cmu25 = pow(Cmu_, 0.25);
+
+    const scalarField& y = rasModel.y()[patchI];
+
+    const scalarField& muw = rasModel.mu().boundaryField()[patchI];
+
+    const scalarField& alphaw = rasModel.alpha().boundaryField()[patchI];
+    scalarField& alphatw = *this;
+
+    const tmp<volScalarField> tk = rasModel.k();
+    const volScalarField& k = tk();
+
+    const fvPatchVectorField& Uw = rasModel.U().boundaryField()[patchI];
+    const scalarField magUp = mag(Uw.patchInternalField() - Uw);
+    const scalarField magGradUw = mag(Uw.snGrad());
+
+    const scalarField& rhow = rasModel.rho().boundaryField()[patchI];
+    const fvPatchScalarField& hw =
+        patch().lookupPatchField<volScalarField, scalar>("h");
+
+    // Heat flux [W/m2] - lagging alphatw
+    const scalarField qDot = (alphaw + alphatw)*hw.snGrad();
+
+    // Populate boundary values
+    forAll(alphatw, faceI)
+    {
+        label faceCellI = patch().faceCells()[faceI];
+
+        scalar uTau = Cmu25*sqrt(k[faceCellI]);
+
+        scalar yPlus = uTau*y[faceI]/(muw[faceI]/rhow[faceI]);
+
+        // Molecular Prandtl number
+        scalar Pr = muw[faceI]/alphaw[faceI];
+
+        // Molecular-to-turbulenbt Prandtl number ratio
+        scalar Prat = Pr/Prt_;
+
+        // Thermal sublayer thickness
+        scalar P = Psmooth(Prat);
+        scalar yPlusTherm = this->yPlusTherm(P, Prat);
+
+        // Evaluate new effective thermal diffusivity
+        scalar alphaEff = 0.0;
+        if (yPlus < yPlusTherm)
+        {
+            scalar A = qDot[faceI]*rhow[faceI]*uTau*y[faceI];
+            scalar B = qDot[faceI]*Pr*yPlus;
+            scalar C = Pr*0.5*rhow[faceI]*uTau*sqr(magUp[faceI]);
+            alphaEff = A/(B + C + VSMALL);
+        }
+        else
+        {
+            scalar A = qDot[faceI]*rhow[faceI]*uTau*y[faceI];
+            scalar B = qDot[faceI]*Prt_*(1.0/kappa_*log(E_*yPlus) + P);
+            scalar magUc = uTau/kappa_*log(E_*yPlusTherm) - mag(Uw[faceI]);
+            scalar C =
+                0.5*rhow[faceI]*uTau
+               *(Prt_*sqr(magUp[faceI]) + (Pr - Prt_)*sqr(magUc));
+            alphaEff = A/(B + C + VSMALL);
+        }
+
+        // Update turbulent thermal diffusivity
+        alphatw[faceI] = max(0.0, alphaEff - alphaw[faceI]);
+
+        if (debug)
+        {
+            Info<< "    uTau           = " << uTau << nl
+                << "    Pr             = " << Pr << nl
+                << "    Prt            = " << Prt_ << nl
+                << "    qDot           = " << qDot[faceI] << nl
+                << "    yPlus          = " << yPlus << nl
+                << "    yPlusTherm     = " << yPlusTherm << nl
+                << "    alphaEff       = " << alphaEff << nl
+                << "    alphaw         = " << alphaw[faceI] << nl
+                << "    alphatw        = " << alphatw[faceI] << nl
+                << endl;
+        }
+    }
+
+    fixedValueFvPatchField<scalar>::updateCoeffs();
+}
+
+
+void alphatJayatillekeWallFunctionFvPatchScalarField::write(Ostream& os) const
+{
+    fvPatchField<scalar>::write(os);
+    os.writeKeyword("Prt") << Prt_ << token::END_STATEMENT << nl;
+    os.writeKeyword("Cmu") << Cmu_ << token::END_STATEMENT << nl;
+    os.writeKeyword("kappa") << kappa_ << token::END_STATEMENT << nl;
+    os.writeKeyword("E") << E_ << token::END_STATEMENT << nl;
+    writeEntry("value", os);
+}
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+makePatchTypeField
+(
+    fvPatchScalarField,
+    alphatJayatillekeWallFunctionFvPatchScalarField
+);
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace RASModels
+} // End namespace compressible
+} // End namespace Foam
+
+// ************************************************************************* //

src/turbulenceModels/compressible/RAS/derivedFvPatchFields/wallFunctions/alphatWallFunctions/alphatJayatillekeWallFunction/alphatJayatillekeWallFunctionFvPatchScalarField.H

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2008-2009 OpenCFD Ltd.
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software; you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by the
+    Free Software Foundation; either version 2 of the License, or (at your
+    option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM; if not, write to the Free Software Foundation,
+    Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+Class
+    alphatJayatillekeWallFunctionFvPatchScalarField
+
+Description
+    Thermal wall function for turbulent thermal diffusivity based on the
+    Jayatilleke thermal wall function
+
+SourceFiles
+    alphatJayatillekeWallFunctionFvPatchScalarField.C
+
+\*---------------------------------------------------------------------------*/
+
+#ifndef alphatJayatillekeWallFunctionFvPatchScalarField_H
+#define alphatJayatillekeWallFunctionFvPatchScalarField_H
+
+#include "fixedValueFvPatchFields.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+namespace compressible
+{
+namespace RASModels
+{
+
+/*---------------------------------------------------------------------------*\
+     Class alphatJayatillekeWallFunctionFvPatchScalarField Declaration
+\*---------------------------------------------------------------------------*/
+
+class alphatJayatillekeWallFunctionFvPatchScalarField
+:
+    public fixedValueFvPatchScalarField
+{
+    // Private data
+
+        //- Turbulent Prandtl number
+        scalar Prt_;
+
+        //- Cmu coefficient
+        scalar Cmu_;
+
+        //- Von Karman constant
+        scalar kappa_;
+
+        //- E coefficient
+        scalar E_;
+
+
+        // Solution parameters
+
+            static scalar maxExp_;
+            static scalar tolerance_;
+            static label maxIters_;
+
+
+    // Private member functions
+
+        //- Check the type of the patch
+        void checkType();
+
+        //- `P' function
+        scalar Psmooth(const scalar Prat) const;
+
+        //- Calculate y+ at the edge of the thermal laminar sublayer
+        scalar yPlusTherm
+        (
+            const scalar P,
+            const scalar Prat
+        ) const;
+
+
+public:
+
+    //- Runtime type information
+    TypeName("alphatJayatillekeWallFunction");
+
+
+    // Constructors
+
+        //- Construct from patch and internal field
+        alphatJayatillekeWallFunctionFvPatchScalarField
+        (
+            const fvPatch&,
+            const DimensionedField<scalar, volMesh>&
+        );
+
+        //- Construct from patch, internal field and dictionary
+        alphatJayatillekeWallFunctionFvPatchScalarField
+        (
+            const fvPatch&,
+            const DimensionedField<scalar, volMesh>&,
+            const dictionary&
+        );
+
+        //- Construct by mapping given an
+        //  alphatJayatillekeWallFunctionFvPatchScalarField
+        //  onto a new patch
+        alphatJayatillekeWallFunctionFvPatchScalarField
+        (
+            const alphatJayatillekeWallFunctionFvPatchScalarField&,
+            const fvPatch&,
+            const DimensionedField<scalar, volMesh>&,
+            const fvPatchFieldMapper&
+        );
+
+        //- Construct as copy
+        alphatJayatillekeWallFunctionFvPatchScalarField
+        (
+            const alphatJayatillekeWallFunctionFvPatchScalarField&
+        );
+
+        //- Construct and return a clone
+        virtual tmp<fvPatchScalarField> clone() const
+        {
+            return tmp<fvPatchScalarField>
+            (
+                new alphatJayatillekeWallFunctionFvPatchScalarField(*this)
+            );
+        }
+
+        //- Construct as copy setting internal field reference
+        alphatJayatillekeWallFunctionFvPatchScalarField
+        (
+            const alphatJayatillekeWallFunctionFvPatchScalarField&,
+            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 alphatJayatillekeWallFunctionFvPatchScalarField
+                (
+                    *this,
+                    iF
+                )
+            );
+        }
+
+
+    // Member functions
+
+        // Evaluation functions
+
+            //- Update the coefficients associated with the patch field
+            virtual void updateCoeffs();
+
+
+        // I-O
+
+            //- Write
+            void write(Ostream&) const;
+};
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace RASModels
+} // End namespace compressible
+} // End namespace Foam
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#endif
+
+// ************************************************************************* //