kOmegaSSTSAS.C

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    Copyright (C) 2019-2020 OpenCFD Ltd.
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#include "kOmegaSSTSAS.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{
namespace RASModels
{

// * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //

template<class BasicTurbulenceModel>
tmp<fvScalarMatrix> kOmegaSSTSAS<BasicTurbulenceModel>::Qsas
(
    const volScalarField::Internal& S2,
    const volScalarField::Internal& gamma,
    const volScalarField::Internal& beta
) const
{
    volScalarField::Internal L
    (
        sqrt(this->k_())/(pow025(this->betaStar_)*this->omega_())
    );

    volScalarField::Internal Lvk
    (
        max
        (
            kappa_*sqrt(S2)
           /(
                mag(fvc::laplacian(this->U_))()()
              + dimensionedScalar
                (
                    "ROOTVSMALL",
                    dimensionSet(0, -1, -1, 0, 0),
                    ROOTVSMALL
                )
            ),
            Cs_*sqrt(kappa_*zeta2_/(beta/this->betaStar_ - gamma))*delta()()
        )
    );

    return fvm::Su
    (
        this->alpha_()*this->rho_()
       *min
        (
            max
            (
                zeta2_*kappa_*S2*sqr(L/Lvk)
              - (2*C_/sigmaPhi_)*this->k_()
               *max
                (
                    magSqr(fvc::grad(this->omega_)()())/sqr(this->omega_()),
                    magSqr(fvc::grad(this->k_)()())/sqr(this->k_())
                ),
                dimensionedScalar(dimensionSet(0, 0, -2, 0, 0), Zero)
            ),
            // Limit SAS production of omega for numerical stability,
            // particularly during start-up
            this->omega_()/(0.1*this->omega_.time().deltaT())
        ),
        this->omega_
    );
}


// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

template<class BasicTurbulenceModel>
kOmegaSSTSAS<BasicTurbulenceModel>::kOmegaSSTSAS
(
    const alphaField& alpha,
    const rhoField& rho,
    const volVectorField& U,
    const surfaceScalarField& alphaRhoPhi,
    const surfaceScalarField& phi,
    const transportModel& transport,
    const word& propertiesName,
    const word& type
)
:
    kOmegaSST<BasicTurbulenceModel>
    (
        alpha,
        rho,
        U,
        alphaRhoPhi,
        phi,
        transport,
        propertiesName,
        type
    ),

    Cs_
    (
        dimensioned<scalar>::getOrAddToDict
        (
            "Cs",
            this->coeffDict_,
            0.11
        )
    ),
    kappa_
    (
        dimensioned<scalar>::getOrAddToDict
        (
            "kappa",
            this->coeffDict_,
            0.41
        )
    ),
    zeta2_
    (
        dimensioned<scalar>::getOrAddToDict
        (
            "zeta2",
            this->coeffDict_,
            3.51
        )
    ),
    sigmaPhi_
    (
        dimensioned<scalar>::getOrAddToDict
        (
            "sigmaPhi",
            this->coeffDict_,
            2.0/3.0
        )
    ),
    C_
    (
        dimensioned<scalar>::getOrAddToDict
        (
            "C",
            this->coeffDict_,
            2
        )
    ),

    delta_
    (
        LESdelta::New
        (
            IOobject::groupName("delta", alphaRhoPhi.group()),
            *this,
            this->coeffDict_
        )
    )
{
    if (type == typeName)
    {
        this->correctNut();
        this->printCoeffs(type);
    }
}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

template<class BasicTurbulenceModel>
bool kOmegaSSTSAS<BasicTurbulenceModel>::read()
{
    if (kOmegaSST<BasicTurbulenceModel>::read())
    {
        Cs_.readIfPresent(this->coeffDict());
        kappa_.readIfPresent(this->coeffDict());
        sigmaPhi_.readIfPresent(this->coeffDict());
        zeta2_.readIfPresent(this->coeffDict());
        C_.readIfPresent(this->coeffDict());

        return true;
    }

    return false;
}


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace RASModels
} // End namespace Foam

// ************************************************************************* //