New version of block-coupled k-omega SST model. Robert Keser
This commit is contained in:
Hrvoje Jasak
parent
2d5052d714
commit
e2f568cd84
2 changed files with 826 additions and 0 deletions
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@ -0,0 +1,552 @@
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/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | foam-extend: Open Source CFD
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\\ / O peration | Version: 3.2
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\\ / A nd | Web: http://www.foam-extend.org
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\\/ M anipulation | For copyright notice see file Copyright
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-------------------------------------------------------------------------------
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License
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This file is part of foam-extend.
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foam-extend is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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foam-extend is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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||||
General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with foam-extend. If not, see <http://www.gnu.org/licenses/>.
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\*---------------------------------------------------------------------------*/
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#include "blockKOmegaSST.H"
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#include "fvBlockMatrix.H"
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#include "addToRunTimeSelectionTable.H"
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#include "backwardsCompatibilityWallFunctions.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace Foam
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{
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namespace incompressible
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{
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namespace RASModels
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{
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// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
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defineTypeNameAndDebug(blockKOmegaSST, 0);
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addToRunTimeSelectionTable(RASModel, blockKOmegaSST, dictionary);
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// * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * * //
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tmp<volScalarField> blockKOmegaSST::F1(const volScalarField& CDkOmega) const
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{
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volScalarField CDkOmegaPlus = max
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(
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CDkOmega,
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dimensionedScalar("1.0e-10", dimless/sqr(dimTime), 1.0e-10)
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);
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volScalarField arg1 = min
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(
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min
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(
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max
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(
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(scalar(1)/betaStar_)*sqrt(k_)/(omega_*y_),
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scalar(500)*nu()/(sqr(y_)*omega_)
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),
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(4*alphaOmega2_)*k_/(CDkOmegaPlus*sqr(y_))
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),
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scalar(10)
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);
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return tanh(pow4(arg1));
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}
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tmp<volScalarField> blockKOmegaSST::F2() const
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{
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volScalarField arg2 = min
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(
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max
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(
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(scalar(2)/betaStar_)*sqrt(k_)/(omega_*y_),
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scalar(500)*nu()/(sqr(y_)*omega_)
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),
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scalar(100)
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);
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return tanh(sqr(arg2));
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}
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tmp<volScalarField> blockKOmegaSST::F3() const
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{
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tmp<volScalarField> arg3 = min
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(
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150*nu()/(omega_*sqr(y_)),
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scalar(10)
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);
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return 1 - tanh(pow4(arg3));
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}
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tmp<volScalarField> blockKOmegaSST::F23() const
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{
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tmp<volScalarField> f23(F2());
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if (F3_)
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{
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f23() *= F3();
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}
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return f23;
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}
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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blockKOmegaSST::blockKOmegaSST
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(
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const volVectorField& U,
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const surfaceScalarField& phi,
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transportModel& lamTransportModel
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)
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:
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RASModel(typeName, U, phi, lamTransportModel),
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alphaK1_
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(
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dimensionedScalar::lookupOrAddToDict
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(
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"alphaK1",
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coeffDict_,
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0.85034
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)
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),
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alphaK2_
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(
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dimensionedScalar::lookupOrAddToDict
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(
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"alphaK2",
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coeffDict_,
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1.0
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)
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),
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alphaOmega1_
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(
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dimensionedScalar::lookupOrAddToDict
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(
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"alphaOmega1",
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coeffDict_,
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0.5
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)
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),
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alphaOmega2_
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(
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dimensionedScalar::lookupOrAddToDict
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(
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"alphaOmega2",
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coeffDict_,
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0.856
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)
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),
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gamma1_
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(
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dimensionedScalar::lookupOrAddToDict
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(
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"gamma1",
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coeffDict_,
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5.0/9.0
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)
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),
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gamma2_
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(
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dimensionedScalar::lookupOrAddToDict
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(
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"gamma2",
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coeffDict_,
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0.44
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)
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),
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beta1_
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(
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dimensionedScalar::lookupOrAddToDict
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(
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"beta1",
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coeffDict_,
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0.075
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)
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),
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beta2_
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(
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dimensionedScalar::lookupOrAddToDict
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(
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"beta2",
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coeffDict_,
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0.0828
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)
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),
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betaStar_
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(
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dimensionedScalar::lookupOrAddToDict
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(
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"betaStar",
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coeffDict_,
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0.09
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)
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),
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a1_
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(
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dimensionedScalar::lookupOrAddToDict
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(
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"a1",
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coeffDict_,
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0.31
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)
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),
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b1_
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(
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dimensionedScalar::lookupOrAddToDict
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(
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"b1",
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coeffDict_,
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1.0
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)
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),
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c1_
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(
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dimensionedScalar::lookupOrAddToDict
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(
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"c1",
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coeffDict_,
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10.0
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)
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),
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F3_
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(
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Switch::lookupOrAddToDict
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(
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"F3",
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coeffDict_,
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false
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)
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),
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y_(mesh_),
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k_
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(
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IOobject
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(
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"k",
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runTime_.timeName(),
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U_.db(),
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IOobject::NO_READ,
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IOobject::AUTO_WRITE
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),
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autoCreateK("k", mesh_, U_.db())
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),
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omega_
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(
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IOobject
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(
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"omega",
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runTime_.timeName(),
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U_.db(),
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IOobject::NO_READ,
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IOobject::AUTO_WRITE
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),
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autoCreateOmega("omega", mesh_, U_.db())
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),
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nut_
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(
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IOobject
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(
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"nut",
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runTime_.timeName(),
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U_.db(),
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IOobject::NO_READ,
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IOobject::AUTO_WRITE
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),
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autoCreateNut("nut", mesh_, U_.db())
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),
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kOmega_
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(
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IOobject
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(
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"kOmega",
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runTime_.timeName(),
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U_.db(),
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IOobject::NO_READ,
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IOobject::NO_WRITE
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),
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mesh_,
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dimensionedVector2("zero", dimless, vector2::zero)
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)
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{
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bound(k_, k0_);
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bound(omega_, omega0_);
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nut_ =
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(
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a1_*k_/
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max
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(
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a1_*omega_,
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b1_*F23()*sqrt(2.0)*mag(symm(fvc::grad(U_)))
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)
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);
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nut_.correctBoundaryConditions();
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printCoeffs();
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}
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// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
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tmp<volSymmTensorField> blockKOmegaSST::R() const
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{
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return tmp<volSymmTensorField>
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(
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new volSymmTensorField
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(
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IOobject
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(
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"R",
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runTime_.timeName(),
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U_.db(),
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IOobject::NO_READ,
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IOobject::NO_WRITE
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),
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((2.0/3.0)*I)*k_ - nut_*twoSymm(fvc::grad(U_)),
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k_.boundaryField().types()
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)
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);
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}
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tmp<volSymmTensorField> blockKOmegaSST::devReff() const
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{
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return tmp<volSymmTensorField>
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(
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new volSymmTensorField
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(
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IOobject
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(
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"devRhoReff",
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runTime_.timeName(),
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U_.db(),
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IOobject::NO_READ,
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IOobject::NO_WRITE
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),
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-nuEff()*dev(twoSymm(fvc::grad(U_)))
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)
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);
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}
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tmp<fvVectorMatrix> blockKOmegaSST::divDevReff(volVectorField& U) const
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{
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return
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(
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- fvm::laplacian(nuEff(), U)
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- fvc::div(nuEff()*dev(fvc::grad(U)().T()))
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);
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}
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bool blockKOmegaSST::read()
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{
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if (RASModel::read())
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{
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alphaK1_.readIfPresent(coeffDict());
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alphaK2_.readIfPresent(coeffDict());
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alphaOmega1_.readIfPresent(coeffDict());
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alphaOmega2_.readIfPresent(coeffDict());
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gamma1_.readIfPresent(coeffDict());
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gamma2_.readIfPresent(coeffDict());
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beta1_.readIfPresent(coeffDict());
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beta2_.readIfPresent(coeffDict());
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betaStar_.readIfPresent(coeffDict());
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a1_.readIfPresent(coeffDict());
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b1_.readIfPresent(coeffDict());
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c1_.readIfPresent(coeffDict());
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F3_.readIfPresent("F3", coeffDict());
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return true;
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}
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else
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{
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return false;
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}
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}
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void blockKOmegaSST::correct()
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{
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// Bound in case of topological change
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// HJ, 22/Aug/2007
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if (mesh_.changing())
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{
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bound(k_, k0_);
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bound(omega_, omega0_);
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}
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RASModel::correct();
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if (!turbulence_)
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{
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return;
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}
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if (mesh_.changing())
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{
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y_.correct();
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}
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const volScalarField S2(2*magSqr(symm(fvc::grad(U_))));
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volScalarField G("RASModel::G", nut_*S2);
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// Make coupled matrix
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fvBlockMatrix<vector2> kOmegaEqn(kOmega_);
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// Update omega and G at the wall
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omega_.boundaryField().updateCoeffs();
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const volScalarField CDkOmega
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(
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(2*alphaOmega2_)*(fvc::grad(k_) & fvc::grad(omega_))/omega_
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);
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const volScalarField F1(this->F1(CDkOmega));
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// Record coupling equations when omega is set. Same equations
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// will be eliminated from k coupling as well due to wall functions
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// HJ, 13/Nov/2015
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labelList eliminated;
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// Turbulent frequency equation
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{
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fvScalarMatrix omegaEqn
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(
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fvm::ddt(omega_)
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+ fvm::div(phi_, omega_)
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+ fvm::SuSp(-fvc::div(phi_), omega_)
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- fvm::laplacian(DomegaEff(F1), omega_)
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==
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gamma(F1)
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*min
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(
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S2,
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(c1_/a1_)*betaStar_*omega_*max(a1_*omega_, b1_*F23()*sqrt(S2))
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)
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- fvm::Sp(2*beta(F1)*omega_, omega_)
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+ beta(F1)*sqr(omega_)
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- fvm::SuSp
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(
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(F1 - scalar(1))*CDkOmega/omega_,
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omega_
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)
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);
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omegaEqn.relax();
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omegaEqn.completeAssembly();
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kOmegaEqn.insertEquation(1, omegaEqn);
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// Add coupling term
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volScalarField couplingOmega
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(
|
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"couplingOmega",
|
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-pos((scalar(1) - F1)*CDkOmega)*(scalar(1) - F1)*CDkOmega/k_
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);
|
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scalarField& couplingOmegaIn = couplingOmega.internalField();
|
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|
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// Collect cell indices where wall functions are active from the
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// omega wall functions
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eliminated = omegaEqn.eliminatedEqns().toc();
|
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|
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// Eliminate coupling in wall function cells for omega
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forAll (eliminated, cellI)
|
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{
|
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couplingOmegaIn[eliminated[cellI]] *= 0;
|
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}
|
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|
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// Insert coupling
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kOmegaEqn.insertEquationCoupling(1, 0, couplingOmega);
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}
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// Turbulent kinetic energy equation
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{
|
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fvScalarMatrix kEqn
|
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(
|
||||
fvm::ddt(k_)
|
||||
+ fvm::div(phi_, k_)
|
||||
+ fvm::SuSp(-fvc::div(phi_), k_)
|
||||
- fvm::laplacian(DkEff(F1), k_)
|
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==
|
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min(G, c1_*betaStar_*k_*omega_)
|
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- fvm::Sp(betaStar_*omega_, k_)
|
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);
|
||||
|
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kEqn.relax();
|
||||
kEqn.completeAssembly();
|
||||
|
||||
kOmegaEqn.insertEquation(0, kEqn);
|
||||
|
||||
// Add coupling term
|
||||
volScalarField couplingK
|
||||
(
|
||||
"couplingK",
|
||||
-pos(G - c1_*betaStar_*k_*omega_)*c1_*betaStar_*k_
|
||||
);
|
||||
scalarField& couplingKIn = couplingK.internalField();
|
||||
|
||||
// Eliminate coupling in wall function cells for k
|
||||
forAll (eliminated, cellI)
|
||||
{
|
||||
couplingKIn[eliminated[cellI]] *= 0;
|
||||
}
|
||||
|
||||
// Insert coupling
|
||||
kOmegaEqn.insertEquationCoupling(0, 1, couplingK);
|
||||
}
|
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|
||||
// Update source coupling: coupling terms eliminated from source
|
||||
kOmegaEqn.updateSourceCoupling();
|
||||
|
||||
kOmegaEqn.solve();
|
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|
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// Retrieve solution
|
||||
kOmegaEqn.retrieveSolution(0, k_.internalField());
|
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kOmegaEqn.retrieveSolution(1, omega_.internalField());
|
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|
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bound(k_, k0_);
|
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bound(omega_, omega0_);
|
||||
|
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k_.correctBoundaryConditions();
|
||||
omega_.correctBoundaryConditions();
|
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|
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// Re-calculate viscosity
|
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// Fixed sqrt(2) error. HJ, 10/Jun/2015
|
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nut_ = a1_*k_/max(a1_*omega_, b1_*F23()*sqrt(S2));
|
||||
nut_ = min(nut_, nuRatio()*nu());
|
||||
nut_.correctBoundaryConditions();
|
||||
}
|
||||
|
||||
|
||||
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
|
||||
|
||||
} // End namespace RASModels
|
||||
} // End namespace incompressible
|
||||
} // End namespace Foam
|
||||
|
||||
// ************************************************************************* //
|
||||
|
|
@ -0,0 +1,274 @@
|
|||
/*---------------------------------------------------------------------------*\
|
||||
========= |
|
||||
\\ / F ield | foam-extend: Open Source CFD
|
||||
\\ / O peration | Version: 3.2
|
||||
\\ / A nd | Web: http://www.foam-extend.org
|
||||
\\/ M anipulation | For copyright notice see file Copyright
|
||||
-------------------------------------------------------------------------------
|
||||
License
|
||||
This file is part of foam-extend.
|
||||
|
||||
foam-extend 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.
|
||||
|
||||
foam-extend 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 foam-extend. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
Class
|
||||
Foam::incompressible::RASModels::blockKOmegaSST
|
||||
|
||||
Description
|
||||
Implementation of the k-omega-SST turbulence model for incompressible
|
||||
flows using a block-coupled solution.
|
||||
|
||||
The default model coefficients correspond to the following:
|
||||
@verbatim
|
||||
blockKOmegaSSTCoeffs
|
||||
{
|
||||
alphaK1 0.85;
|
||||
alphaK2 1.0;
|
||||
alphaOmega1 0.5;
|
||||
alphaOmega2 0.856;
|
||||
beta1 0.075;
|
||||
beta2 0.0828;
|
||||
betaStar 0.09;
|
||||
gamma1 5/9;
|
||||
gamma2 0.44;
|
||||
a1 0.31;
|
||||
b1 1.0;
|
||||
c1 10.0;
|
||||
F3 no;
|
||||
}
|
||||
@endverbatim
|
||||
|
||||
SourceFiles
|
||||
blockKOmegaSST.C
|
||||
|
||||
\*---------------------------------------------------------------------------*/
|
||||
|
||||
#ifndef blockKOmegaSST_H
|
||||
#define blockKOmegaSST_H
|
||||
|
||||
#include "RASModel.H"
|
||||
#include "wallDist.H"
|
||||
|
||||
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
|
||||
|
||||
namespace Foam
|
||||
{
|
||||
namespace incompressible
|
||||
{
|
||||
namespace RASModels
|
||||
{
|
||||
|
||||
/*---------------------------------------------------------------------------*\
|
||||
Class kOmega Declaration
|
||||
\*---------------------------------------------------------------------------*/
|
||||
|
||||
class blockKOmegaSST
|
||||
:
|
||||
public RASModel
|
||||
{
|
||||
// Private data
|
||||
|
||||
// Model coefficients
|
||||
dimensionedScalar alphaK1_;
|
||||
dimensionedScalar alphaK2_;
|
||||
|
||||
dimensionedScalar alphaOmega1_;
|
||||
dimensionedScalar alphaOmega2_;
|
||||
|
||||
dimensionedScalar gamma1_;
|
||||
dimensionedScalar gamma2_;
|
||||
|
||||
dimensionedScalar beta1_;
|
||||
dimensionedScalar beta2_;
|
||||
|
||||
dimensionedScalar betaStar_;
|
||||
|
||||
dimensionedScalar a1_;
|
||||
dimensionedScalar b1_;
|
||||
dimensionedScalar c1_;
|
||||
|
||||
Switch F3_;
|
||||
|
||||
|
||||
//- Wall distance field
|
||||
// Note: different to wall distance in parent RASModel
|
||||
wallDist y_;
|
||||
|
||||
// Fields
|
||||
|
||||
volScalarField k_;
|
||||
volScalarField omega_;
|
||||
volScalarField nut_;
|
||||
|
||||
// Block vector field for k-omega
|
||||
volVector2Field kOmega_;
|
||||
|
||||
|
||||
// Private member functions
|
||||
|
||||
tmp<volScalarField> F1(const volScalarField& CDkOmega) const;
|
||||
tmp<volScalarField> F2() const;
|
||||
tmp<volScalarField> F3() const;
|
||||
tmp<volScalarField> F23() const;
|
||||
|
||||
tmp<volScalarField> blend
|
||||
(
|
||||
const volScalarField& F1,
|
||||
const dimensionedScalar& psi1,
|
||||
const dimensionedScalar& psi2
|
||||
) const
|
||||
{
|
||||
return F1*(psi1 - psi2) + psi2;
|
||||
}
|
||||
|
||||
tmp<volScalarField> alphaK
|
||||
(
|
||||
const volScalarField& F1
|
||||
) const
|
||||
{
|
||||
return blend(F1, alphaK1_, alphaK2_);
|
||||
}
|
||||
|
||||
tmp<volScalarField> alphaOmega
|
||||
(
|
||||
const volScalarField& F1
|
||||
) const
|
||||
{
|
||||
return blend(F1, alphaOmega1_, alphaOmega2_);
|
||||
}
|
||||
|
||||
tmp<volScalarField> beta
|
||||
(
|
||||
const volScalarField& F1
|
||||
) const
|
||||
{
|
||||
return blend(F1, beta1_, beta2_);
|
||||
}
|
||||
|
||||
tmp<volScalarField> gamma
|
||||
(
|
||||
const volScalarField& F1
|
||||
) const
|
||||
{
|
||||
return blend(F1, gamma1_, gamma2_);
|
||||
}
|
||||
|
||||
|
||||
public:
|
||||
|
||||
//- Runtime type information
|
||||
TypeName("blockKOmegaSST");
|
||||
|
||||
|
||||
// Constructors
|
||||
|
||||
//- Construct from components
|
||||
blockKOmegaSST
|
||||
(
|
||||
const volVectorField& U,
|
||||
const surfaceScalarField& phi,
|
||||
transportModel& transport
|
||||
);
|
||||
|
||||
|
||||
//- Destructor
|
||||
|
||||
virtual ~blockKOmegaSST()
|
||||
{}
|
||||
|
||||
|
||||
// Member Functions
|
||||
|
||||
//- Return the turbulence viscosity
|
||||
virtual tmp<volScalarField> nut() const
|
||||
{
|
||||
return nut_;
|
||||
}
|
||||
|
||||
//- Return the effective diffusivity for k
|
||||
tmp<volScalarField> DkEff(const volScalarField& F1) const
|
||||
{
|
||||
return tmp<volScalarField>
|
||||
(
|
||||
new volScalarField("DkEff", alphaK(F1)*nut_ + nu())
|
||||
);
|
||||
}
|
||||
|
||||
//- Return the effective diffusivity for omega
|
||||
tmp<volScalarField> DomegaEff(const volScalarField& F1) const
|
||||
{
|
||||
return tmp<volScalarField>
|
||||
(
|
||||
new volScalarField("DomegaEff", alphaOmega(F1)*nut_ + nu())
|
||||
);
|
||||
}
|
||||
|
||||
//- Return the turbulence kinetic energy
|
||||
virtual tmp<volScalarField> k() const
|
||||
{
|
||||
return k_;
|
||||
}
|
||||
|
||||
//- Return the turbulence specific dissipation rate
|
||||
virtual tmp<volScalarField> omega() const
|
||||
{
|
||||
return omega_;
|
||||
}
|
||||
|
||||
//- Return the turbulence kinetic energy dissipation rate
|
||||
virtual tmp<volScalarField> epsilon() const
|
||||
{
|
||||
return tmp<volScalarField>
|
||||
(
|
||||
new volScalarField
|
||||
(
|
||||
IOobject
|
||||
(
|
||||
"epsilon",
|
||||
mesh_.time().timeName(),
|
||||
mesh_
|
||||
),
|
||||
betaStar_*k_*omega_,
|
||||
omega_.boundaryField().types()
|
||||
)
|
||||
);
|
||||
}
|
||||
|
||||
//- Return the Reynolds stress tensor
|
||||
virtual tmp<volSymmTensorField> R() const;
|
||||
|
||||
//- Return the effective stress tensor including the laminar stress
|
||||
virtual tmp<volSymmTensorField> devReff() const;
|
||||
|
||||
//- Return the source term for the momentum equation
|
||||
virtual tmp<fvVectorMatrix> divDevReff(volVectorField& U) const;
|
||||
|
||||
//- Solve the turbulence equations and correct the turbulence viscosity
|
||||
virtual void correct();
|
||||
|
||||
//- Read RASProperties dictionary
|
||||
virtual bool read();
|
||||
};
|
||||
|
||||
|
||||
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
|
||||
|
||||
} // End namespace RASModels
|
||||
} // namespace incompressible
|
||||
} // End namespace Foam
|
||||
|
||||
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
|
||||
|
||||
#endif
|
||||
|
||||
// ************************************************************************* //
|
||||
Reference in a new issue