DeardorffDiffStress.C

Go to the documentation of this file.

/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2011-2024 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 "DeardorffDiffStress.H"
#include "fvModels.H"
#include "fvConstraints.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace LESModels
{
 
// * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
 
template<class BasicMomentumTransportModel>
void DeardorffDiffStress<BasicMomentumTransportModel>::correctNut()
{
    this->nut_ = Ck_*sqrt(this->k())*this->delta();
    this->nut_.correctBoundaryConditions();
    fvConstraints::New(this->mesh_).constrain(this->nut_);
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
template<class BasicMomentumTransportModel>
DeardorffDiffStress<BasicMomentumTransportModel>::DeardorffDiffStress
(
    const alphaField& alpha,
    const rhoField& rho,
    const volVectorField& U,
    const surfaceScalarField& alphaRhoPhi,
    const surfaceScalarField& phi,
    const viscosity& viscosity,
    const word& type
)
:
    ReynoldsStress<LESModel<BasicMomentumTransportModel>>
    (
        type,
        alpha,
        rho,
        U,
        alphaRhoPhi,
        phi,
        viscosity
    ),
 
    Ck_("Ck", this->coeffDict(), 0.094),
    Cm_("Cm", this->coeffDict(), 4.13),
    Ce_("Ce", this->coeffDict(), 1.05),
    Cs_("Cs", this->coeffDict(), 0.25)
{
    if (type == typeName)
    {
        this->boundNormalStress(this->R_);
    }
}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
template<class BasicMomentumTransportModel>
bool DeardorffDiffStress<BasicMomentumTransportModel>::read()
{
    if (ReynoldsStress<LESModel<BasicMomentumTransportModel>>::read())
    {
        Ck_.readIfPresent(this->coeffDict());
        Cm_.readIfPresent(this->coeffDict());
        Ce_.readIfPresent(this->coeffDict());
        Cs_.readIfPresent(this->coeffDict());
 
        return true;
    }
    else
    {
        return false;
    }
}
 
 
template<class BasicMomentumTransportModel>
tmp<volScalarField>
DeardorffDiffStress<BasicMomentumTransportModel>::epsilon() const
{
    const volScalarField k(this->k());
 
    return volScalarField::New
    (
        this->groupName("epsilon"),
        this->Ce_*k*sqrt(k)/this->delta()
    );
}
 
 
template<class BasicMomentumTransportModel>
tmp<volScalarField>
DeardorffDiffStress<BasicMomentumTransportModel>::omega() const
{
    const volScalarField k(this->k());
 
    return volScalarField::New
    (
        this->groupName("omega"),
        (this->Ce_/this->Ck_)*sqrt(k)/this->delta()
    );
}
 
 
template<class BasicMomentumTransportModel>
void DeardorffDiffStress<BasicMomentumTransportModel>::correct()
{
    if (!this->turbulence_)
    {
        return;
    }
 
    // Local references
    const alphaField& alpha = this->alpha_;
    const rhoField& rho = this->rho_;
    const surfaceScalarField& alphaRhoPhi = this->alphaRhoPhi_;
    const volVectorField& U = this->U_;
    volSymmTensorField& R = this->R_;
    const Foam::fvModels& fvModels(Foam::fvModels::New(this->mesh_));
    const Foam::fvConstraints& fvConstraints
    (
        Foam::fvConstraints::New(this->mesh_)
    );
 
    ReynoldsStress<LESModel<BasicMomentumTransportModel>>::correct();
 
    tmp<volTensorField> tgradU(fvc::grad(U));
    const volTensorField& gradU = tgradU();
 
    volSymmTensorField D(symm(gradU));
 
    volSymmTensorField P(-twoSymm(R & gradU));
 
    volScalarField k(this->k());
 
    tmp<fvSymmTensorMatrix> REqn
    (
        fvm::ddt(alpha, rho, R)
      + fvm::div(alphaRhoPhi, R)
      - fvm::laplacian(I*this->nu() + Cs_*(k/this->epsilon())*R, R)
      + fvm::Sp(Cm_*alpha*rho*sqrt(k)/this->delta(), R)
     ==
        alpha*rho*P
      + (4.0/5.0)*alpha*rho*k*D
      - ((2.0/3.0)*(1.0 - Cm_/this->Ce_)*I)*(alpha*rho*this->epsilon())
      + this->RSource()
      + fvModels.source(alpha, rho, R)
    );
 
    REqn.ref().relax();
    fvConstraints.constrain(REqn.ref());
    REqn.ref().solve();
    fvConstraints.constrain(R);
    this->boundNormalStress(R);
 
    correctNut();
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace LESModels
} // End namespace Foam
 
// ************************************************************************* //