LamBremhorstKE.C

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#include "LamBremhorstKE.H"
#include "wallDist.H"
#include "bound.H"
#include "makeMomentumTransportModel.H"
 
makeMomentumTransportModelTypes
(
    geometricOneField,
    geometricOneField,
    incompressibleMomentumTransportModel
)
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace incompressible
{
namespace RASModels
{
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
defineTypeNameAndDebug(LamBremhorstKE, 0);
addToRunTimeSelectionTable
(
    RASincompressibleMomentumTransportModel,
    LamBremhorstKE,
    dictionary
);
 
// * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * * //
 
tmp<volScalarField> LamBremhorstKE::boundEpsilon()
{
    tmp<volScalarField> tCmuk2(Cmu_*sqr(k_));
    epsilon_ = max(epsilon_, tCmuk2()/(nutMaxCoeff_*nu()));
    return tCmuk2;
}
 
 
tmp<volScalarField> LamBremhorstKE::Rt() const
{
    return sqr(k_)/(nu()*epsilon_);
}
 
 
tmp<volScalarField> LamBremhorstKE::fMu(const volScalarField& Rt) const
{
    tmp<volScalarField> Ry(sqrt(k_)*y()/nu());
    return sqr(scalar(1) - exp(-0.0165*Ry))*(scalar(1) + 20.5/(Rt + small));
}
 
 
tmp<volScalarField> LamBremhorstKE::f1(const volScalarField& fMu) const
{
    return scalar(1) + pow3(0.05/(fMu + small));
}
 
 
tmp<volScalarField> LamBremhorstKE::f2(const volScalarField& Rt) const
{
    return scalar(1) - exp(-sqr(Rt));
}
 
 
void LamBremhorstKE::correctNut(const volScalarField& fMu)
{
    nut_ = fMu*boundEpsilon()/epsilon_;
    nut_.correctBoundaryConditions();
}
 
 
// * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
 
void LamBremhorstKE::correctNut()
{
    correctNut(fMu(Rt()));
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
LamBremhorstKE::LamBremhorstKE
(
    const geometricOneField& alpha,
    const geometricOneField& rho,
    const volVectorField& U,
    const surfaceScalarField& alphaRhoPhi,
    const surfaceScalarField& phi,
    const viscosity& viscosity,
    const word& type
)
:
    eddyViscosity<incompressible::RASModel>
    (
        type,
        alpha,
        rho,
        U,
        alphaRhoPhi,
        phi,
        viscosity
    ),
 
    Cmu_("Cmu", coeffDict(), 0.09),
    Ceps1_("Ceps1", coeffDict(), 1.44),
    Ceps2_("Ceps2", coeffDict(), 1.92),
    sigmaEps_("alphaEps", coeffDict(), 1.3),
 
    k_
    (
        IOobject
        (
            this->groupName("k"),
            runTime_.name(),
            mesh_,
            IOobject::MUST_READ,
            IOobject::AUTO_WRITE
        ),
        mesh_
    ),
 
    epsilon_
    (
        IOobject
        (
            this->groupName("epsilon"),
            runTime_.name(),
            mesh_,
            IOobject::MUST_READ,
            IOobject::AUTO_WRITE
        ),
        mesh_
    )
{
    bound(k_, kMin_);
    boundEpsilon();
}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
bool LamBremhorstKE::read()
{
    if (eddyViscosity<incompressible::RASModel>::read())
    {
        Cmu_.readIfPresent(coeffDict());
        Ceps1_.readIfPresent(coeffDict());
        Ceps2_.readIfPresent(coeffDict());
        sigmaEps_.readIfPresent(coeffDict());
 
        return true;
    }
    else
    {
        return false;
    }
}
 
 
void LamBremhorstKE::correct()
{
    if (!turbulence_)
    {
        return;
    }
 
    eddyViscosity<incompressible::RASModel>::correct();
 
    tmp<volTensorField> tgradU = fvc::grad(U_);
    volScalarField G(GName(), nut_*(twoSymm(tgradU()) && tgradU()));
    tgradU.clear();
 
    // Update epsilon and G at the wall
    epsilon_.boundaryFieldRef().updateCoeffs();
 
    const volScalarField Rt(this->Rt());
    const volScalarField fMu(this->fMu(Rt));
 
    // Dissipation equation
    tmp<fvScalarMatrix> epsEqn
    (
        fvm::ddt(epsilon_)
      + fvm::div(phi_, epsilon_)
      - fvm::laplacian(DepsilonEff(), epsilon_)
     ==
        Ceps1_*f1(fMu)*G*epsilon_/k_
      - fvm::Sp(Ceps2_*f2(Rt)*epsilon_/k_, epsilon_)
    );
 
    epsEqn.ref().relax();
    epsEqn.ref().boundaryManipulate(epsilon_.boundaryFieldRef());
    solve(epsEqn);
    boundEpsilon();
 
    // Turbulent kinetic energy equation
    tmp<fvScalarMatrix> kEqn
    (
        fvm::ddt(k_)
      + fvm::div(phi_, k_)
      - fvm::laplacian(DkEff(), k_)
     ==
        G - fvm::Sp(epsilon_/k_, k_)
    );
 
    kEqn.ref().relax();
    solve(kEqn);
    bound(k_, kMin_);
 
    correctNut(fMu);
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace RASModels
} // End namespace incompressible
} // End namespace Foam
 
// ************************************************************************* //