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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 "PDRkEpsilon.H"
#include "PDRDragModel.H"
#include "addToRunTimeSelectionTable.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
namespace compressible
{
namespace RASModels
{
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
defineTypeNameAndDebug(PDRkEpsilon, 0);
addToRunTimeSelectionTable(RASModel, PDRkEpsilon, dictionary);
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
PDRkEpsilon::PDRkEpsilon
(
const geometricOneField& alpha,
const volScalarField& rho,
const volVectorField& U,
const surfaceScalarField& alphaRhoPhi,
const surfaceScalarField& phi,
const fluidThermo& thermophysicalModel,
const word& turbulenceModelName,
const word& modelName
)
:
Foam::RASModels::kEpsilon<EddyDiffusivity<compressible::turbulenceModel>>
(
geometricOneField(),
rho,
U,
phi,
phi,
thermophysicalModel,
turbulenceModelName,
modelName
),
C4_
(
dimensioned<scalar>::lookupOrAddToDict
(
"C4",
coeffDict_,
0.1
)
)
{}
// * * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * //
PDRkEpsilon::~PDRkEpsilon()
{}
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
bool PDRkEpsilon::read()
{
if (RASModel::read())
{
C4_.readIfPresent(coeffDict_);
return true;
}
else
{
return false;
}
}
void PDRkEpsilon::correct()
{
if (!turbulence_)
{
// Re-calculate viscosity
nut_ = Cmu_*sqr(k_)/epsilon_;
nut_.correctBoundaryConditions();
// Re-calculate thermal diffusivity
//***HGWalphat_ = mut_/Prt_;
//alphat_.correctBoundaryConditions();
return;
}
RASModel::correct();
volScalarField divU(fvc::div(phi_/fvc::interpolate(rho_)));
if (mesh_.moving())
{
divU += fvc::div(mesh_.phi());
}
tmp<volTensorField> tgradU = fvc::grad(U_);
volScalarField G(GName(), rho_*nut_*(tgradU() && dev(twoSymm(tgradU()))));
tgradU.clear();
// Update espsilon and G at the wall
epsilon_.boundaryFieldRef().updateCoeffs();
// Add the blockage generation term so that it is included consistently
// in both the k and epsilon equations
const volScalarField& betav =
U_.db().lookupObject<volScalarField>("betav");
const volScalarField& Lobs =
U_.db().lookupObject<volScalarField>("Lobs");
const PDRDragModel& drag =
U_.db().lookupObject<PDRDragModel>("PDRDragModel");
volScalarField GR(drag.Gk());
volScalarField LI
(C4_*(Lobs + dimensionedScalar("minLength", dimLength, VSMALL)));
// Dissipation equation
tmp<fvScalarMatrix> epsEqn
(
betav*fvm::ddt(rho_, epsilon_)
+ fvm::div(phi_, epsilon_)
- fvm::laplacian(rho_*DepsilonEff(), epsilon_)
==
C1_*betav*G*epsilon_/k_
+ 1.5*pow(Cmu_, 3.0/4.0)*GR*sqrt(k_)/LI
- fvm::SuSp(((2.0/3.0)*C1_)*betav*rho_*divU, epsilon_)
- fvm::Sp(C2_*betav*rho_*epsilon_/k_, epsilon_)
);
epsEqn.ref().relax();
epsEqn.ref().boundaryManipulate(epsilon_.boundaryFieldRef());
solve(epsEqn);
bound(epsilon_, epsilonMin_);
// Turbulent kinetic energy equation
tmp<fvScalarMatrix> kEqn
(
betav*fvm::ddt(rho_, k_)
+ fvm::div(phi_, k_)
- fvm::laplacian(rho_*DkEff(), k_)
==
betav*G + GR
- fvm::SuSp((2.0/3.0)*betav*rho_*divU, k_)
- fvm::Sp(betav*rho_*epsilon_/k_, k_)
);
kEqn.ref().relax();
solve(kEqn);
bound(k_, kMin_);
// Re-calculate viscosity
nut_ = Cmu_*sqr(k_)/epsilon_;
nut_.correctBoundaryConditions();
// Re-calculate thermal diffusivity
//***HGWalphat_ = mut_/Prt_;
//alphat_.correctBoundaryConditions();
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace RASModels
} // End namespace compressible
} // End namespace Foam
// ************************************************************************* //
|
