LaheyKEpsilon.C

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    Copyright (C) 2013-2016 OpenFOAM Foundation
    Copyright (C) 2019-2020 OpenCFD Ltd.
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#include "LaheyKEpsilon.H"
#include "fvOptions.H"
#include "twoPhaseSystem.H"
#include "dragModel.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace RASModels
{
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
template<class BasicTurbulenceModel>
LaheyKEpsilon<BasicTurbulenceModel>::LaheyKEpsilon
(
    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
    ),
 
    gasTurbulencePtr_(nullptr),
 
    alphaInversion_
    (
        dimensioned<scalar>::getOrAddToDict
        (
            "alphaInversion",
            this->coeffDict_,
            0.3
        )
    ),
 
    Cp_
    (
        dimensioned<scalar>::getOrAddToDict
        (
            "Cp",
            this->coeffDict_,
            0.25
        )
    ),
 
    C3_
    (
        dimensioned<scalar>::getOrAddToDict
        (
            "C3",
            this->coeffDict_,
            this->C2_.value()
        )
    ),
 
    Cmub_
    (
        dimensioned<scalar>::getOrAddToDict
        (
            "Cmub",
            this->coeffDict_,
            0.6
        )
    )
{
    if (type == typeName)
    {
        this->printCoeffs(type);
    }
}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
template<class BasicTurbulenceModel>
bool LaheyKEpsilon<BasicTurbulenceModel>::read()
{
    if (kEpsilon<BasicTurbulenceModel>::read())
    {
        alphaInversion_.readIfPresent(this->coeffDict());
        Cp_.readIfPresent(this->coeffDict());
        C3_.readIfPresent(this->coeffDict());
        Cmub_.readIfPresent(this->coeffDict());
 
        return true;
    }
 
    return false;
}
 
 
template<class BasicTurbulenceModel>
const PhaseCompressibleTurbulenceModel
<
    typename BasicTurbulenceModel::transportModel
>&
LaheyKEpsilon<BasicTurbulenceModel>::gasTurbulence() const
{
    if (!gasTurbulencePtr_)
    {
        const volVectorField& U = this->U_;
 
        const transportModel& liquid = this->transport();
        const twoPhaseSystem& fluid =
            refCast<const twoPhaseSystem>(liquid.fluid());
        const transportModel& gas = fluid.otherPhase(liquid);
 
        gasTurbulencePtr_ =
           &U.db()
           .lookupObject<PhaseCompressibleTurbulenceModel<transportModel>>
            (
                IOobject::groupName
                (
                    turbulenceModel::propertiesName,
                    gas.name()
                )
            );
    }
 
    return *gasTurbulencePtr_;
}
 
 
template<class BasicTurbulenceModel>
void LaheyKEpsilon<BasicTurbulenceModel>::correctNut()
{
    const PhaseCompressibleTurbulenceModel<transportModel>& gasTurbulence =
        this->gasTurbulence();
 
    this->nut_ =
        this->Cmu_*sqr(this->k_)/this->epsilon_
      + Cmub_*gasTurbulence.transport().d()*gasTurbulence.alpha()
       *(mag(this->U_ - gasTurbulence.U()));
 
    this->nut_.correctBoundaryConditions();
    fv::options::New(this->mesh_).correct(this->nut_);
 
    BasicTurbulenceModel::correctNut();
}
 
 
template<class BasicTurbulenceModel>
tmp<volScalarField> LaheyKEpsilon<BasicTurbulenceModel>::bubbleG() const
{
    const PhaseCompressibleTurbulenceModel<transportModel>& gasTurbulence =
        this->gasTurbulence();
 
    const transportModel& liquid = this->transport();
    const twoPhaseSystem& fluid = refCast<const twoPhaseSystem>(liquid.fluid());
    const transportModel& 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.nu()/gas.d(), 4.0/3.0)
           *pow(magUr, 5.0/3.0)
        )
       *gas
       /gas.d()
    );
 
    return bubbleG;
}
 
 
template<class BasicTurbulenceModel>
tmp<volScalarField>
LaheyKEpsilon<BasicTurbulenceModel>::phaseTransferCoeff() const
{
    const volVectorField& U = this->U_;
    const alphaField& alpha = this->alpha_;
    const rhoField& rho = this->rho_;
 
    const turbulenceModel& gasTurbulence = this->gasTurbulence();
 
    return
    (
        max(alphaInversion_ - alpha, scalar(0))
       *rho
       *min(gasTurbulence.epsilon()/gasTurbulence.k(), 1.0/U.time().deltaT())
    );
}
 
 
template<class BasicTurbulenceModel>
tmp<fvScalarMatrix> LaheyKEpsilon<BasicTurbulenceModel>::kSource() const
{
    const alphaField& alpha = this->alpha_;
    const rhoField& rho = this->rho_;
 
    const PhaseCompressibleTurbulenceModel<transportModel>& gasTurbulence =
        this->gasTurbulence();
 
    const volScalarField phaseTransferCoeff(this->phaseTransferCoeff());
 
    return
        alpha*rho*bubbleG()
      + phaseTransferCoeff*gasTurbulence.k()
      - fvm::Sp(phaseTransferCoeff, this->k_);
}
 
 
template<class BasicTurbulenceModel>
tmp<fvScalarMatrix> LaheyKEpsilon<BasicTurbulenceModel>::epsilonSource() const
{
    const alphaField& alpha = this->alpha_;
    const rhoField& rho = this->rho_;
 
    const PhaseCompressibleTurbulenceModel<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 BasicTurbulenceModel>
void LaheyKEpsilon<BasicTurbulenceModel>::correct()
{
    kEpsilon<BasicTurbulenceModel>::correct();
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace RASModels
} // End namespace Foam
 
// ************************************************************************* //