continuousGasKEqn.C

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#include "continuousGasKEqn.H"
#include "phaseSystem.H"

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

namespace Foam
{
namespace LESModels
{

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

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

    liquidTurbulencePtr_(nullptr),

    alphaInversion_
    (
        dimensioned<scalar>::lookupOrAddToDict
        (
            "alphaInversion",
            this->coeffDict_,
            0.7
        )
    )
{
    if (type == typeName)
    {
        this->printCoeffs(type);
    }
}


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

template<class BasicMomentumTransportModel>
bool continuousGasKEqn<BasicMomentumTransportModel>::read()
{
    if (kEqn<BasicMomentumTransportModel>::read())
    {
        alphaInversion_.readIfPresent(this->coeffDict());

        return true;
    }
    else
    {
        return false;
    }
}


template<class BasicMomentumTransportModel>
const momentumTransportModel&
continuousGasKEqn<BasicMomentumTransportModel>::liquidTurbulence() const
{
    if (!liquidTurbulencePtr_)
    {
        const volVectorField& U = this->U_;

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

        liquidTurbulencePtr_ =
           &U.db().lookupObject<momentumTransportModel>
            (
                IOobject::groupName
                (
                    momentumTransportModel::typeName,
                    liquid.name()
                )
            );
    }

    return *liquidTurbulencePtr_;
}


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

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

    return
    (
        max(alphaInversion_ - alpha, scalar(0))
       *rho
       *min
        (
            this->Ce_*sqrt(liquidTurbulence.k())/this->delta(),
            1.0/U.time().deltaT()
        )
    );
}


template<class BasicMomentumTransportModel>
tmp<fvScalarMatrix>
continuousGasKEqn<BasicMomentumTransportModel>::kSource() const
{
    const momentumTransportModel& liquidTurbulence = this->liquidTurbulence();
    const volScalarField phaseTransferCoeff(this->phaseTransferCoeff());

    return
        phaseTransferCoeff*liquidTurbulence.k()
      - fvm::Sp(phaseTransferCoeff, this->k_);
}


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

} // End namespace LESModels
} // End namespace Foam

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