Coupled RAS models: initial version
This commit is contained in:
Hrvoje Jasak
Dominik Christ
parent
4608dddc89
commit
21caef72f1
5 changed files with 1278 additions and 0 deletions
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@ -18,6 +18,9 @@ NonlinearKEShih/NonlinearKEShih.C
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LienLeschzinerLowRe/LienLeschzinerLowRe.C
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LamBremhorstKE/LamBremhorstKE.C
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coupledKEpsilon/coupledKEpsilon.C
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coupledKOmegaSST/coupledKOmegaSST.C
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/* Wall functions */
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wallFunctions = derivedFvPatchFields/wallFunctions
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@ -0,0 +1,333 @@
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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 |
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\\ / A nd | For copyright notice see file Copyright
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of foam-extend.
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||||
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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.
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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 "coupledKEpsilon.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(coupledKEpsilon, 0);
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addToRunTimeSelectionTable(RASModel, coupledKEpsilon, dictionary);
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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coupledKEpsilon::coupledKEpsilon
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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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Cmu_
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(
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dimensioned<scalar>::lookupOrAddToDict
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(
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"Cmu",
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coeffDict_,
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0.09
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)
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),
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C1_
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(
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dimensioned<scalar>::lookupOrAddToDict
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(
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"C1",
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coeffDict_,
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1.44
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)
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),
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C2_
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(
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dimensioned<scalar>::lookupOrAddToDict
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(
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"C2",
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coeffDict_,
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1.92
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)
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),
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sigmaEps_
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(
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dimensioned<scalar>::lookupOrAddToDict
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(
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"sigmaEps",
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coeffDict_,
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1.3
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)
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),
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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_)
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),
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epsilon_
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(
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IOobject
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(
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"epsilon",
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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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autoCreateEpsilon("epsilon", mesh_)
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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_)
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),
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kEpsilon_
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(
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IOobject
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(
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"kEpsilon",
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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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nut_ = Cmu_*sqr(k_)/(epsilon_ + epsilonSmall_);
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nut_ = min(nut_, nuRatio()*nu());
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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> coupledKEpsilon::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> coupledKEpsilon::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> coupledKEpsilon::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 coupledKEpsilon::read()
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{
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if (RASModel::read())
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{
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Cmu_.readIfPresent(coeffDict());
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C1_.readIfPresent(coeffDict());
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C2_.readIfPresent(coeffDict());
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sigmaEps_.readIfPresent(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 coupledKEpsilon::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(epsilon_, epsilon0_);
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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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// Make coupled matrix
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fvBlockMatrix<vector2> keEqn(kEpsilon_);
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volScalarField G("RASModel::G", nut_*2*magSqr(symm(fvc::grad(U_))));
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// Update epsilon and G at the wall
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epsilon_.boundaryField().updateCoeffs();
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// Dissipation equation
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{
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fvScalarMatrix epsEqn
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(
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fvm::ddt(epsilon_)
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+ fvm::div(phi_, epsilon_)
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+ fvm::SuSp(-fvc::div(phi_), epsilon_)
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- fvm::laplacian(DepsilonEff(), epsilon_)
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+ fvm::Sp(C2_*epsilon_/k_, epsilon_)
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==
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C1_*G*epsilon_/k_
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);
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epsEqn.relax();
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epsEqn.completeAssembly();
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keEqn.insertEquation(1, epsEqn);
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// Add coupling term:
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// G_epsilon = C1*Cmu*(symm(grad(U))) k
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// but with wall function corrections: must be calculated from G
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// HJ, 27/Apr/2015
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volScalarField coupling
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(
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"coupling",
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-C1_*G*epsilon_/sqr(k_)
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);
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scalarField& couplingIn = coupling.internalField();
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// Eliminate coupling in wall function cells
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labelList eliminated = epsEqn.eliminatedEqns().toc();
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forAll (eliminated, cellI)
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{
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couplingIn[eliminated[cellI]] *= 0;
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}
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// Insert coupling
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keEqn.insertEquationCoupling(1, 0, coupling);
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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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(
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fvm::ddt(k_)
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+ fvm::div(phi_, k_)
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+ fvm::SuSp(-fvc::div(phi_), k_)
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- fvm::laplacian(DkEff(), k_)
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+ fvm::SuSp((epsilon_ - G)/k_, k_)
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);
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kEqn.relax();
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keEqn.insertEquation(0, kEqn);
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}
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// Update source coupling: coupling terms eliminated from source
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keEqn.updateSourceCoupling();
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keEqn.solve();
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// Retrieve solution
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keEqn.retrieveSolution(0, k_.internalField());
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keEqn.retrieveSolution(1, epsilon_.internalField());
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k_.correctBoundaryConditions();
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epsilon_.correctBoundaryConditions();
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bound(epsilon_, epsilon0_);
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bound(k_, k0_);
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// Re-calculate viscosity
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nut_ = Cmu_*sqr(k_)/epsilon_;
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nut_ = min(nut_, nuRatio()*nu());
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nut_.correctBoundaryConditions();
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}
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End namespace RASModels
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} // End namespace incompressible
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} // End namespace Foam
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// ************************************************************************* //
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@ -0,0 +1,178 @@
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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 |
|
||||
\\ / A nd | For copyright notice see file Copyright
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||||
\\/ M anipulation |
|
||||
-------------------------------------------------------------------------------
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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
|
||||
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/>.
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Class
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Foam::incompressible::RASModels::coupledKEpsilon
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Description
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Standard k-epsilon turbulence model for incompressible flows using
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a block-coupled solution.
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The default model coefficients correspond to the following:
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@verbatim
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coupledKEpsilonCoeffs
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{
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Cmu 0.09;
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C1 1.44;
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C2 1.92;
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sigmaEps 1.3;
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}
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@endverbatim
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Author
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Hrvoje Jasak, Wikki Ltd. All rights reserved.
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SourceFiles
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coupledKEpsilon.C
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\*---------------------------------------------------------------------------*/
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#ifndef coupledKEpsilon_H
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#define coupledKEpsilon_H
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#include "RASModel.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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/*---------------------------------------------------------------------------*\
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Class coupledKEpsilon Declaration
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\*---------------------------------------------------------------------------*/
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class coupledKEpsilon
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:
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public RASModel
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{
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// Private data
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// Model coefficients
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dimensionedScalar Cmu_;
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dimensionedScalar C1_;
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dimensionedScalar C2_;
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dimensionedScalar sigmaEps_;
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// Fields
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volScalarField k_;
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volScalarField epsilon_;
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volScalarField nut_;
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// Block vector field for k-epsilon
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volVector2Field kEpsilon_;
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public:
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//- Runtime type information
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TypeName("coupledKEpsilon");
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// Constructors
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//- Construct from components
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coupledKEpsilon
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(
|
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const volVectorField& U,
|
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const surfaceScalarField& phi,
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transportModel& transport
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);
|
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|
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|
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//- Destructor
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virtual ~coupledKEpsilon()
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{}
|
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// Member Functions
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|
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//- Return the turbulence viscosity
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virtual tmp<volScalarField> nut() const
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{
|
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return nut_;
|
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}
|
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|
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//- Return the effective diffusivity for k
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tmp<volScalarField> DkEff() const
|
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{
|
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return tmp<volScalarField>
|
||||
(
|
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new volScalarField("DkEff", nut_ + nu())
|
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);
|
||||
}
|
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|
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//- Return the effective diffusivity for epsilon
|
||||
tmp<volScalarField> DepsilonEff() const
|
||||
{
|
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return tmp<volScalarField>
|
||||
(
|
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new volScalarField("DepsilonEff", nut_/sigmaEps_ + nu())
|
||||
);
|
||||
}
|
||||
|
||||
//- Return the turbulence kinetic energy
|
||||
virtual tmp<volScalarField> k() const
|
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{
|
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return k_;
|
||||
}
|
||||
|
||||
//- Return the turbulence kinetic energy dissipation rate
|
||||
virtual tmp<volScalarField> epsilon() const
|
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{
|
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return epsilon_;
|
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}
|
||||
|
||||
//- Return the Reynolds stress tensor
|
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virtual tmp<volSymmTensorField> R() const;
|
||||
|
||||
//- Return the effective stress tensor including the laminar stress
|
||||
virtual tmp<volSymmTensorField> devReff() const;
|
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|
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//- Return the source term for the momentum equation
|
||||
virtual tmp<fvVectorMatrix> divDevReff(volVectorField& U) const;
|
||||
|
||||
//- Solve the turbulence equations and correct the turbulence viscosity
|
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virtual void correct();
|
||||
|
||||
//- Read RASProperties dictionary
|
||||
virtual bool read();
|
||||
};
|
||||
|
||||
|
||||
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
|
||||
|
||||
} // End namespace RASModels
|
||||
} // End namespace incompressible
|
||||
} // End namespace Foam
|
||||
|
||||
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
|
||||
|
||||
#endif
|
||||
|
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// ************************************************************************* //
|
||||
|
|
@ -0,0 +1,469 @@
|
|||
/*---------------------------------------------------------------------------*\
|
||||
========= |
|
||||
\\ / F ield | foam-extend: Open Source CFD
|
||||
\\ / O peration |
|
||||
\\ / A nd | For copyright notice see file Copyright
|
||||
\\/ M anipulation |
|
||||
-------------------------------------------------------------------------------
|
||||
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/>.
|
||||
|
||||
\*---------------------------------------------------------------------------*/
|
||||
|
||||
#include "coupledKOmegaSST.H"
|
||||
#include "fvBlockMatrix.H"
|
||||
#include "addToRunTimeSelectionTable.H"
|
||||
|
||||
#include "backwardsCompatibilityWallFunctions.H"
|
||||
|
||||
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
|
||||
|
||||
namespace Foam
|
||||
{
|
||||
namespace incompressible
|
||||
{
|
||||
namespace RASModels
|
||||
{
|
||||
|
||||
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
|
||||
|
||||
defineTypeNameAndDebug(coupledKOmegaSST, 0);
|
||||
addToRunTimeSelectionTable(RASModel, coupledKOmegaSST, dictionary);
|
||||
|
||||
// * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * * //
|
||||
|
||||
tmp<volScalarField> coupledKOmegaSST::F1(const volScalarField& CDkOmega) const
|
||||
{
|
||||
volScalarField CDkOmegaPlus = max
|
||||
(
|
||||
CDkOmega,
|
||||
dimensionedScalar("1.0e-10", dimless/sqr(dimTime), 1.0e-10)
|
||||
);
|
||||
|
||||
volScalarField arg1 = min
|
||||
(
|
||||
min
|
||||
(
|
||||
max
|
||||
(
|
||||
(scalar(1)/betaStar_)*sqrt(k_)/(omega_*y_),
|
||||
scalar(500)*nu()/(sqr(y_)*omega_)
|
||||
),
|
||||
(4*alphaOmega2_)*k_/(CDkOmegaPlus*sqr(y_))
|
||||
),
|
||||
scalar(10)
|
||||
);
|
||||
|
||||
return tanh(pow4(arg1));
|
||||
}
|
||||
|
||||
tmp<volScalarField> coupledKOmegaSST::F2() const
|
||||
{
|
||||
volScalarField arg2 = min
|
||||
(
|
||||
max
|
||||
(
|
||||
(scalar(2)/betaStar_)*sqrt(k_)/(omega_*y_),
|
||||
scalar(500)*nu()/(sqr(y_)*omega_)
|
||||
),
|
||||
scalar(100)
|
||||
);
|
||||
|
||||
return tanh(sqr(arg2));
|
||||
}
|
||||
|
||||
|
||||
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
|
||||
|
||||
coupledKOmegaSST::coupledKOmegaSST
|
||||
(
|
||||
const volVectorField& U,
|
||||
const surfaceScalarField& phi,
|
||||
transportModel& lamTransportModel
|
||||
)
|
||||
:
|
||||
RASModel(typeName, U, phi, lamTransportModel),
|
||||
|
||||
alphaK1_
|
||||
(
|
||||
dimensioned<scalar>::lookupOrAddToDict
|
||||
(
|
||||
"alphaK1",
|
||||
coeffDict_,
|
||||
0.85034
|
||||
)
|
||||
),
|
||||
alphaK2_
|
||||
(
|
||||
dimensioned<scalar>::lookupOrAddToDict
|
||||
(
|
||||
"alphaK2",
|
||||
coeffDict_,
|
||||
1.0
|
||||
)
|
||||
),
|
||||
alphaOmega1_
|
||||
(
|
||||
dimensioned<scalar>::lookupOrAddToDict
|
||||
(
|
||||
"alphaOmega1",
|
||||
coeffDict_,
|
||||
0.5
|
||||
)
|
||||
),
|
||||
alphaOmega2_
|
||||
(
|
||||
dimensioned<scalar>::lookupOrAddToDict
|
||||
(
|
||||
"alphaOmega2",
|
||||
coeffDict_,
|
||||
0.85616
|
||||
)
|
||||
),
|
||||
gamma1_
|
||||
(
|
||||
dimensioned<scalar>::lookupOrAddToDict
|
||||
(
|
||||
"gamma1",
|
||||
coeffDict_,
|
||||
0.5532
|
||||
)
|
||||
),
|
||||
gamma2_
|
||||
(
|
||||
dimensioned<scalar>::lookupOrAddToDict
|
||||
(
|
||||
"gamma2",
|
||||
coeffDict_,
|
||||
0.4403
|
||||
)
|
||||
),
|
||||
beta1_
|
||||
(
|
||||
dimensioned<scalar>::lookupOrAddToDict
|
||||
(
|
||||
"beta1",
|
||||
coeffDict_,
|
||||
0.075
|
||||
)
|
||||
),
|
||||
beta2_
|
||||
(
|
||||
dimensioned<scalar>::lookupOrAddToDict
|
||||
(
|
||||
"beta2",
|
||||
coeffDict_,
|
||||
0.0828
|
||||
)
|
||||
),
|
||||
betaStar_
|
||||
(
|
||||
dimensioned<scalar>::lookupOrAddToDict
|
||||
(
|
||||
"betaStar",
|
||||
coeffDict_,
|
||||
0.09
|
||||
)
|
||||
),
|
||||
a1_
|
||||
(
|
||||
dimensioned<scalar>::lookupOrAddToDict
|
||||
(
|
||||
"a1",
|
||||
coeffDict_,
|
||||
0.31
|
||||
)
|
||||
),
|
||||
c1_
|
||||
(
|
||||
dimensioned<scalar>::lookupOrAddToDict
|
||||
(
|
||||
"c1",
|
||||
coeffDict_,
|
||||
10.0
|
||||
)
|
||||
),
|
||||
|
||||
y_(mesh_),
|
||||
|
||||
k_
|
||||
(
|
||||
IOobject
|
||||
(
|
||||
"k",
|
||||
runTime_.timeName(),
|
||||
U_.db(),
|
||||
IOobject::NO_READ,
|
||||
IOobject::AUTO_WRITE
|
||||
),
|
||||
autoCreateK("k", mesh_, U_.db())
|
||||
),
|
||||
omega_
|
||||
(
|
||||
IOobject
|
||||
(
|
||||
"omega",
|
||||
runTime_.timeName(),
|
||||
U_.db(),
|
||||
IOobject::NO_READ,
|
||||
IOobject::AUTO_WRITE
|
||||
),
|
||||
autoCreateOmega("omega", mesh_, U_.db())
|
||||
),
|
||||
nut_
|
||||
(
|
||||
IOobject
|
||||
(
|
||||
"nut",
|
||||
runTime_.timeName(),
|
||||
U_.db(),
|
||||
IOobject::NO_READ,
|
||||
IOobject::AUTO_WRITE
|
||||
),
|
||||
autoCreateNut("nut", mesh_, U_.db())
|
||||
),
|
||||
kOmega_
|
||||
(
|
||||
IOobject
|
||||
(
|
||||
"kOmega",
|
||||
runTime_.timeName(),
|
||||
U_.db(),
|
||||
IOobject::NO_READ,
|
||||
IOobject::NO_WRITE
|
||||
),
|
||||
mesh_,
|
||||
dimensionedVector2("zero", dimless, vector2::zero)
|
||||
)
|
||||
{
|
||||
bound(omega_, omega0_);
|
||||
|
||||
nut_ = a1_*k_/max(a1_*omega_, F2()*sqrt(2.0)*mag(symm(fvc::grad(U_))));
|
||||
nut_.correctBoundaryConditions();
|
||||
|
||||
printCoeffs();
|
||||
}
|
||||
|
||||
|
||||
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
|
||||
|
||||
tmp<volSymmTensorField> coupledKOmegaSST::R() const
|
||||
{
|
||||
return tmp<volSymmTensorField>
|
||||
(
|
||||
new volSymmTensorField
|
||||
(
|
||||
IOobject
|
||||
(
|
||||
"R",
|
||||
runTime_.timeName(),
|
||||
U_.db(),
|
||||
IOobject::NO_READ,
|
||||
IOobject::NO_WRITE
|
||||
),
|
||||
((2.0/3.0)*I)*k_ - nut_*twoSymm(fvc::grad(U_)),
|
||||
k_.boundaryField().types()
|
||||
)
|
||||
);
|
||||
}
|
||||
|
||||
|
||||
tmp<volSymmTensorField> coupledKOmegaSST::devReff() const
|
||||
{
|
||||
return tmp<volSymmTensorField>
|
||||
(
|
||||
new volSymmTensorField
|
||||
(
|
||||
IOobject
|
||||
(
|
||||
"devRhoReff",
|
||||
runTime_.timeName(),
|
||||
U_.db(),
|
||||
IOobject::NO_READ,
|
||||
IOobject::NO_WRITE
|
||||
),
|
||||
-nuEff()*dev(twoSymm(fvc::grad(U_)))
|
||||
)
|
||||
);
|
||||
}
|
||||
|
||||
|
||||
tmp<fvVectorMatrix> coupledKOmegaSST::divDevReff(volVectorField& U) const
|
||||
{
|
||||
return
|
||||
(
|
||||
- fvm::laplacian(nuEff(), U)
|
||||
- fvc::div(nuEff()*dev(fvc::grad(U)().T()))
|
||||
);
|
||||
}
|
||||
|
||||
|
||||
bool coupledKOmegaSST::read()
|
||||
{
|
||||
if (RASModel::read())
|
||||
{
|
||||
alphaK1_.readIfPresent(coeffDict());
|
||||
alphaK2_.readIfPresent(coeffDict());
|
||||
alphaOmega1_.readIfPresent(coeffDict());
|
||||
alphaOmega2_.readIfPresent(coeffDict());
|
||||
gamma1_.readIfPresent(coeffDict());
|
||||
gamma2_.readIfPresent(coeffDict());
|
||||
beta1_.readIfPresent(coeffDict());
|
||||
beta2_.readIfPresent(coeffDict());
|
||||
betaStar_.readIfPresent(coeffDict());
|
||||
a1_.readIfPresent(coeffDict());
|
||||
c1_.readIfPresent(coeffDict());
|
||||
|
||||
return true;
|
||||
}
|
||||
else
|
||||
{
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void coupledKOmegaSST::correct()
|
||||
{
|
||||
// Bound in case of topological change
|
||||
// HJ, 22/Aug/2007
|
||||
if (mesh_.changing())
|
||||
{
|
||||
bound(k_, k0_);
|
||||
bound(omega_, omega0_);
|
||||
}
|
||||
|
||||
RASModel::correct();
|
||||
|
||||
if (!turbulence_)
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
if (mesh_.changing())
|
||||
{
|
||||
y_.correct();
|
||||
}
|
||||
|
||||
volScalarField S2 = magSqr(symm(fvc::grad(U_)));
|
||||
volScalarField G("RASModel::G", nut_*2*S2);
|
||||
|
||||
// Make coupled matrix
|
||||
fvBlockMatrix<vector2> kOmegaEqn(kOmega_);
|
||||
|
||||
// Update omega and G at the wall
|
||||
omega_.boundaryField().updateCoeffs();
|
||||
|
||||
volScalarField CDkOmega =
|
||||
(2*alphaOmega2_)*(fvc::grad(k_) & fvc::grad(omega_))/omega_;
|
||||
|
||||
volScalarField F1 = this->F1(CDkOmega);
|
||||
|
||||
Info<< "Coupled k-omega" << endl;
|
||||
|
||||
// Turbulent frequency equation
|
||||
{
|
||||
fvScalarMatrix omegaEqn
|
||||
(
|
||||
fvm::ddt(omega_)
|
||||
+ fvm::div(phi_, omega_)
|
||||
+ fvm::SuSp(-fvc::div(phi_), omega_)
|
||||
- fvm::laplacian(DomegaEff(F1), omega_)
|
||||
+ fvm::SuSp
|
||||
(
|
||||
beta(F1)*omega_
|
||||
+ (F1 - scalar(1))*CDkOmega/omega_,
|
||||
omega_
|
||||
)
|
||||
==
|
||||
gamma(F1)*2*S2
|
||||
);
|
||||
|
||||
omegaEqn.relax();
|
||||
omegaEqn.completeAssembly();
|
||||
|
||||
kOmegaEqn.insertEquation(1, omegaEqn);
|
||||
|
||||
// Add coupling term
|
||||
volScalarField coupling
|
||||
(
|
||||
"coupling",
|
||||
-gamma(F1)*2*S2/k_
|
||||
);
|
||||
scalarField& couplingIn = coupling.internalField();
|
||||
|
||||
// Eliminate coupling in wall function cells
|
||||
labelList eliminated = omegaEqn.eliminatedEqns().toc();
|
||||
|
||||
forAll (eliminated, cellI)
|
||||
{
|
||||
couplingIn[eliminated[cellI]] *= 0;
|
||||
}
|
||||
|
||||
// Insert coupling
|
||||
kOmegaEqn.insertEquationCoupling(1, 0, coupling);
|
||||
}
|
||||
|
||||
// Turbulent kinetic energy equation
|
||||
{
|
||||
fvScalarMatrix kEqn
|
||||
(
|
||||
fvm::ddt(k_)
|
||||
+ fvm::div(phi_, k_)
|
||||
+ fvm::SuSp(-fvc::div(phi_), k_)
|
||||
- fvm::laplacian(DkEff(F1), k_)
|
||||
+ fvm::SuSp
|
||||
(
|
||||
betaStar_*omega_
|
||||
- min(G/k_, c1_*betaStar_*omega_),
|
||||
k_
|
||||
)
|
||||
);
|
||||
|
||||
kEqn.relax();
|
||||
|
||||
kOmegaEqn.insertEquation(0, kEqn);
|
||||
}
|
||||
|
||||
// Update source coupling: coupling terms eliminated from source
|
||||
kOmegaEqn.updateSourceCoupling();
|
||||
|
||||
kOmegaEqn.solve();
|
||||
|
||||
// Retrieve solution
|
||||
kOmegaEqn.retrieveSolution(0, k_.internalField());
|
||||
kOmegaEqn.retrieveSolution(1, omega_.internalField());
|
||||
|
||||
k_.correctBoundaryConditions();
|
||||
omega_.correctBoundaryConditions();
|
||||
|
||||
bound(k_, k0_);
|
||||
bound(omega_, omega0_);
|
||||
|
||||
// Re-calculate viscosity
|
||||
nut_ = a1_*k_/max(a1_*omega_, F2()*sqrt(2*S2));
|
||||
nut_ = min(nut_, nuRatio()*nu());
|
||||
nut_.correctBoundaryConditions();
|
||||
}
|
||||
|
||||
|
||||
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
|
||||
|
||||
} // End namespace RASModels
|
||||
} // End namespace incompressible
|
||||
} // End namespace Foam
|
||||
|
||||
// ************************************************************************* //
|
||||
|
|
@ -0,0 +1,295 @@
|
|||
/*---------------------------------------------------------------------------*\
|
||||
========= |
|
||||
\\ / F ield | foam-extend: Open Source CFD
|
||||
\\ / O peration |
|
||||
\\ / A nd | For copyright notice see file Copyright
|
||||
\\/ M anipulation |
|
||||
-------------------------------------------------------------------------------
|
||||
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::coupledKOmegaSST
|
||||
|
||||
Description
|
||||
Implementation of the k-omega-SST turbulence model for incompressible
|
||||
flows using a block-coupled solution.
|
||||
|
||||
Turbulence model described in:
|
||||
@verbatim
|
||||
Menter, F., Esch, T.
|
||||
"Elements of Industrial Heat Transfer Prediction"
|
||||
16th Brazilian Congress of Mechanical Engineering (COBEM),
|
||||
Nov. 2001
|
||||
@endverbatim
|
||||
|
||||
Note that this implementation is written in terms of alpha diffusion
|
||||
coefficients rather than the more traditional sigma (alpha = 1/sigma) so
|
||||
that the blending can be applied to all coefficuients in a consistent
|
||||
manner. The paper suggests that sigma is blended but this would not be
|
||||
consistent with the blending of the k-epsilon and k-omega models.
|
||||
|
||||
Also note that the error in the last term of equation (2) relating to
|
||||
sigma has been corrected.
|
||||
|
||||
Wall-functions are applied in this implementation by using equations (14)
|
||||
to specify the near-wall omega as appropriate.
|
||||
|
||||
The blending functions (15) and (16) are not currently used because of the
|
||||
uncertainty in their origin, range of applicability and that is y+ becomes
|
||||
sufficiently small blending u_tau in this manner clearly becomes nonsense.
|
||||
|
||||
The default model coefficients correspond to the following:
|
||||
@verbatim
|
||||
coupledKOmegaSSTCoeffs
|
||||
{
|
||||
alphaK1 0.85034;
|
||||
alphaK2 1.0;
|
||||
alphaOmega1 0.5;
|
||||
alphaOmega2 0.85616;
|
||||
beta1 0.075;
|
||||
beta2 0.0828;
|
||||
betaStar 0.09;
|
||||
gamma1 0.5532;
|
||||
gamma2 0.4403;
|
||||
a1 0.31;
|
||||
c1 10.0;
|
||||
}
|
||||
@endverbatim
|
||||
|
||||
Author
|
||||
Hrvoje Jasak, Wikki Ltd. All rights reserved.
|
||||
|
||||
SourceFiles
|
||||
coupledKOmegaSST.C
|
||||
|
||||
\*---------------------------------------------------------------------------*/
|
||||
|
||||
#ifndef coupledKOmegaSST_H
|
||||
#define coupledKOmegaSST_H
|
||||
|
||||
#include "RASModel.H"
|
||||
#include "wallDist.H"
|
||||
|
||||
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
|
||||
|
||||
namespace Foam
|
||||
{
|
||||
namespace incompressible
|
||||
{
|
||||
namespace RASModels
|
||||
{
|
||||
|
||||
/*---------------------------------------------------------------------------*\
|
||||
Class kOmega Declaration
|
||||
\*---------------------------------------------------------------------------*/
|
||||
|
||||
class coupledKOmegaSST
|
||||
:
|
||||
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 c1_;
|
||||
|
||||
|
||||
//- 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> 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("coupledKOmegaSST");
|
||||
|
||||
|
||||
// Constructors
|
||||
|
||||
//- Construct from components
|
||||
coupledKOmegaSST
|
||||
(
|
||||
const volVectorField& U,
|
||||
const surfaceScalarField& phi,
|
||||
transportModel& transport
|
||||
);
|
||||
|
||||
|
||||
//- Destructor
|
||||
|
||||
virtual ~coupledKOmegaSST()
|
||||
{}
|
||||
|
||||
|
||||
// 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