buoyantKEpsilon.C

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    Copyright (C) 2014-2015 OpenFOAM Foundation
    Copyright (C) 2018-2020 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.

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#include "buoyantKEpsilon.H"
#include "gravityMeshObject.H"
#include "fvcGrad.H"
#include "addToRunTimeSelectionTable.H"

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

namespace Foam
{
namespace RASModels
{

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

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

    Cg_
    (
        dimensioned<scalar>::getOrAddToDict
        (
            "Cg",
            this->coeffDict_,
            1.0
        )
    )
{
    if (type == typeName)
    {
        this->printCoeffs(type);
    }
}


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

template<class BasicTurbulenceModel>
bool buoyantKEpsilon<BasicTurbulenceModel>::read()
{
    if (kEpsilon<BasicTurbulenceModel>::read())
    {
        Cg_.readIfPresent(this->coeffDict());

        return true;
    }

    return false;
}


template<class BasicTurbulenceModel>
tmp<volScalarField>
buoyantKEpsilon<BasicTurbulenceModel>::Gcoef() const
{
    const uniformDimensionedVectorField& g =
        meshObjects::gravity::New(this->mesh_.time());

    return
        (Cg_*this->Cmu_)*this->alpha_*this->k_*(g & fvc::grad(this->rho_))
       /(this->epsilon_ + this->epsilonMin_);
}


template<class BasicTurbulenceModel>
tmp<fvScalarMatrix>
buoyantKEpsilon<BasicTurbulenceModel>::kSource() const
{
    const uniformDimensionedVectorField& g =
        meshObjects::gravity::New(this->mesh_.time());

    if (mag(g.value()) > SMALL)
    {
        return -fvm::SuSp(Gcoef(), this->k_);
    }

    return kEpsilon<BasicTurbulenceModel>::kSource();
}


template<class BasicTurbulenceModel>
tmp<fvScalarMatrix>
buoyantKEpsilon<BasicTurbulenceModel>::epsilonSource() const
{
    const uniformDimensionedVectorField& g =
        meshObjects::gravity::New(this->mesh_.time());

    if (mag(g.value()) > SMALL)
    {
        vector gHat(g.value()/mag(g.value()));

        volScalarField v(gHat & this->U_);
        volScalarField u
        (
            mag(this->U_ - gHat*v)
          + dimensionedScalar("SMALL", dimVelocity, SMALL)
        );

        return -fvm::SuSp(this->C1_*tanh(mag(v)/u)*Gcoef(), this->epsilon_);
    }

    return kEpsilon<BasicTurbulenceModel>::epsilonSource();
}


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

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

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