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alphatJayatillekeWallFunctionFvPatchScalarField.C
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alphatJayatillekeWallFunctionFvPatchScalarField.C
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/*---------------------------------------------------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 2011-2016 OpenFOAM Foundation
\\/ 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 3 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, see <http://www.gnu.org/licenses/>.
\*---------------------------------------------------------------------------*/
#include "alphatJayatillekeWallFunctionFvPatchScalarField.H"
#include "turbulentFluidThermoModel.H"
#include "fvPatchFieldMapper.H"
#include "volFields.H"
#include "addToRunTimeSelectionTable.H"
#include "wallFvPatch.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
namespace compressible
{
// * * * * * * * * * * * * * * 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()))
{
FatalErrorInFunction
<< "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();
// Retrieve turbulence properties from model
const compressible::turbulenceModel& turbModel =
db().lookupObject<compressible::turbulenceModel>
(
IOobject::groupName
(
compressible::turbulenceModel::propertiesName,
internalField().group()
)
);
const scalar Cmu25 = pow025(Cmu_);
const scalarField& y = turbModel.y()[patchi];
const tmp<scalarField> tmuw = turbModel.mu(patchi);
const scalarField& muw = tmuw();
const tmp<scalarField> talphaw = turbModel.alpha(patchi);
const scalarField& alphaw = talphaw();
scalarField& alphatw = *this;
const tmp<volScalarField> tk = turbModel.k();
const volScalarField& k = tk();
const fvPatchVectorField& Uw = turbModel.U().boundaryField()[patchi];
const scalarField magUp(mag(Uw.patchInternalField() - Uw));
const scalarField magGradUw(mag(Uw.snGrad()));
const scalarField& rhow = turbModel.rho().boundaryField()[patchi];
const fvPatchScalarField& hew =
turbModel.transport().he().boundaryField()[patchi];
// Heat flux [W/m2] - lagging alphatw
const scalarField qDot
(
turbModel.transport().alphaEff(alphatw, patchi)*hew.snGrad()
);
// Populate boundary values
forAll(alphatw, facei)
{
label celli = patch().faceCells()[facei];
scalar uTau = Cmu25*sqrt(k[celli]);
scalar yPlus = uTau*y[facei]/(muw[facei]/rhow[facei]);
// Molecular Prandtl number
scalar Pr = muw[facei]/alphaw[facei];
// Molecular-to-turbulent 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 compressible
} // End namespace Foam
// ************************************************************************* //