LaheyKEpsilon.C

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#include "LaheyKEpsilon.H"
#include "fvModels.H"
#include "fvConstraints.H"
#include "phaseSystem.H"
#include "dragModel.H"

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

namespace Foam
{
namespace RASModels
{

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

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

    gasTurbulencePtr_(nullptr),

    alphaInversion_
    (
        dimensioned<scalar>::lookupOrAddToDict
        (
            "alphaInversion",
            this->coeffDict_,
            0.3
        )
    ),

    Cp_
    (
        dimensioned<scalar>::lookupOrAddToDict
        (
            "Cp",
            this->coeffDict_,
            0.25
        )
    ),

    C3_
    (
        dimensioned<scalar>::lookupOrAddToDict
        (
            "C3",
            this->coeffDict_,
            this->C2_.value()
        )
    ),

    Cmub_
    (
        dimensioned<scalar>::lookupOrAddToDict
        (
            "Cmub",
            this->coeffDict_,
            0.6
        )
    )
{
    if (type == typeName)
    {
        this->printCoeffs(type);
    }
}


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

template<class BasicMomentumTransportModel>
bool LaheyKEpsilon<BasicMomentumTransportModel>::read()
{
    if (kEpsilon<BasicMomentumTransportModel>::read())
    {
        alphaInversion_.readIfPresent(this->coeffDict());
        Cp_.readIfPresent(this->coeffDict());
        C3_.readIfPresent(this->coeffDict());
        Cmub_.readIfPresent(this->coeffDict());

        return true;
    }
    else
    {
        return false;
    }
}


template<class BasicMomentumTransportModel>
const PhaseCompressibleMomentumTransportModel
<
    typename BasicMomentumTransportModel::transportModel
>&
LaheyKEpsilon<BasicMomentumTransportModel>::gasTurbulence() const
{
    if (!gasTurbulencePtr_)
    {
        const volVectorField& U = this->U_;

        const phaseModel& liquid = refCast<const phaseModel>(this->transport());
        const phaseSystem& fluid = liquid.fluid();
        const phaseModel& gas = fluid.otherPhase(liquid);

        gasTurbulencePtr_ =
           &U.db().lookupObject
            <
                PhaseCompressibleMomentumTransportModel<transportModel>
            >
            (
                IOobject::groupName
                (
                    momentumTransportModel::typeName,
                    gas.name()
                )
            );
    }

    return *gasTurbulencePtr_;
}


template<class BasicMomentumTransportModel>
void LaheyKEpsilon<BasicMomentumTransportModel>::correctNut()
{
    const PhaseCompressibleMomentumTransportModel<transportModel>&
        gasTurbulence = this->gasTurbulence();

    const phaseModel& liquid = refCast<const phaseModel>(this->transport());
    const phaseSystem& fluid = liquid.fluid();
    const phaseModel& gas = fluid.otherPhase(liquid);

    this->nut_ =
        this->Cmu_*sqr(this->k_)/this->epsilon_
      + Cmub_*gas.d()*gasTurbulence.alpha()
       *(mag(this->U_ - gasTurbulence.U()));

    this->nut_.correctBoundaryConditions();
    fvConstraints::New(this->mesh_).constrain(this->nut_);
}


template<class BasicMomentumTransportModel>
tmp<volScalarField> LaheyKEpsilon<BasicMomentumTransportModel>::bubbleG() const
{
    const PhaseCompressibleMomentumTransportModel<transportModel>&
        gasTurbulence = this->gasTurbulence();

    const phaseModel& liquid = refCast<const phaseModel>(this->transport());
    const phaseSystem& fluid = liquid.fluid();
    const phaseModel& gas = fluid.otherPhase(liquid);

    const dragModel& drag = fluid.lookupSubModel<dragModel>(gas, liquid);

    volScalarField magUr(mag(this->U_ - gasTurbulence.U()));

    tmp<volScalarField> bubbleG
    (
        Cp_
       *(
            pow3(magUr)
          + pow(drag.CdRe()*liquid.thermo().nu()/gas.d(), 4.0/3.0)
           *pow(magUr, 5.0/3.0)
        )
       *gas
       /gas.d()
    );

    return bubbleG;
}


template<class BasicMomentumTransportModel>
tmp<volScalarField>
LaheyKEpsilon<BasicMomentumTransportModel>::phaseTransferCoeff() const
{
    const volVectorField& U = this->U_;
    const alphaField& alpha = this->alpha_;
    const rhoField& rho = this->rho_;

    const momentumTransportModel& gasTurbulence = this->gasTurbulence();

    return
    (
        max(alphaInversion_ - alpha, scalar(0))
       *rho
       *min(gasTurbulence.epsilon()/gasTurbulence.k(), 1.0/U.time().deltaT())
    );
}


template<class BasicMomentumTransportModel>
tmp<fvScalarMatrix> LaheyKEpsilon<BasicMomentumTransportModel>::kSource() const
{
    const alphaField& alpha = this->alpha_;
    const rhoField& rho = this->rho_;

    const PhaseCompressibleMomentumTransportModel<transportModel>&
        gasTurbulence = this->gasTurbulence();

    const volScalarField phaseTransferCoeff(this->phaseTransferCoeff());

    return
        alpha*rho*bubbleG()
      + phaseTransferCoeff*gasTurbulence.k()
      - fvm::Sp(phaseTransferCoeff, this->k_);
}


template<class BasicMomentumTransportModel>
tmp<fvScalarMatrix>
LaheyKEpsilon<BasicMomentumTransportModel>::epsilonSource() const
{
    const alphaField& alpha = this->alpha_;
    const rhoField& rho = this->rho_;

    const PhaseCompressibleMomentumTransportModel<transportModel>&
        gasTurbulence = this->gasTurbulence();

    const volScalarField phaseTransferCoeff(this->phaseTransferCoeff());

    return
        alpha*rho*this->C3_*this->epsilon_*bubbleG()/this->k_
      + phaseTransferCoeff*gasTurbulence.epsilon()
      - fvm::Sp(phaseTransferCoeff, this->epsilon_);
}


template<class BasicMomentumTransportModel>
void LaheyKEpsilon<BasicMomentumTransportModel>::correct()
{
    kEpsilon<BasicMomentumTransportModel>::correct();
}


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

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

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