LaheyKEpsilon.C

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#include "LaheyKEpsilon.H"
#include "fvModels.H"
#include "fvConstraints.H"
#include "phaseSystem.H"
#include "dispersedDragModel.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 viscosity& viscosity,
    const word& type
)
:
    kEpsilon<BasicMomentumTransportModel>
    (
        alpha,
        rho,
        U,
        alphaRhoPhi,
        phi,
        viscosity,
        type
    ),
 
    gasTurbulencePtr_(nullptr),
 
    alphaInversion_("alphaInversion", this->coeffDict(), 0.3),
    Cp_("Cp", this->coeffDict(), 0.25),
    C4_("C4", this->coeffDict(), this->C2_.value()),
    Cmub_("Cmub", this->coeffDict(), 0.6)
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
template<class BasicMomentumTransportModel>
bool LaheyKEpsilon<BasicMomentumTransportModel>::read()
{
    if (kEpsilon<BasicMomentumTransportModel>::read())
    {
        alphaInversion_.readIfPresent(this->coeffDict());
        Cp_.readIfPresent(this->coeffDict());
        C4_.readIfPresent(this->coeffDict());
        Cmub_.readIfPresent(this->coeffDict());
 
        return true;
    }
    else
    {
        return false;
    }
}
 
 
template<class BasicMomentumTransportModel>
const phaseCompressibleMomentumTransportModel&
LaheyKEpsilon<BasicMomentumTransportModel>::gasTurbulence() const
{
    if (!gasTurbulencePtr_)
    {
        const volVectorField& U = this->U_;
 
        const phaseModel& liquid =
            refCast<const phaseModel>(this->properties());
        const phaseSystem& fluid = liquid.fluid();
        const phaseModel& gas = fluid.otherPhase(liquid);
 
        gasTurbulencePtr_ =
           &U.db().lookupObject
            <
                phaseCompressibleMomentumTransportModel
            >
            (
                IOobject::groupName
                (
                    momentumTransportModel::typeName,
                    gas.name()
                )
            );
    }
 
    return *gasTurbulencePtr_;
}
 
 
template<class BasicMomentumTransportModel>
void LaheyKEpsilon<BasicMomentumTransportModel>::correctNut()
{
    const phaseCompressibleMomentumTransportModel& gasTurbulence =
        this->gasTurbulence();
 
    const phaseModel& liquid = refCast<const phaseModel>(this->properties());
    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& gasTurbulence =
        this->gasTurbulence();
 
    const phaseModel& liquid = refCast<const phaseModel>(this->properties());
    const phaseSystem& fluid = liquid.fluid();
    const phaseModel& gas = fluid.otherPhase(liquid);
 
    const dragModels::dispersedDragModel& drag =
        fluid.lookupInterfacialModel<dragModels::dispersedDragModel>
        (dispersedPhaseInterface(gas, liquid));
 
    volScalarField magUr(mag(this->U_ - gasTurbulence.U()));
 
    tmp<volScalarField> bubbleG
    (
        Cp_
       *(
            pow3(magUr)
          + pow(drag.CdRe()*liquid.fluidThermo().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& 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& gasTurbulence =
        this->gasTurbulence();
 
    const volScalarField phaseTransferCoeff(this->phaseTransferCoeff());
 
    return
        alpha*rho*this->C4_*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
 
// ************************************************************************* //