SchnerrSauer.C

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#include "SchnerrSauer.H"
#include "mathematicalConstants.H"
#include "addToRunTimeSelectionTable.H"

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

namespace Foam
{
namespace twoPhaseChangeModels
{
    defineTypeNameAndDebug(SchnerrSauer, 0);
    addToRunTimeSelectionTable
    (
        cavitationModel,
        SchnerrSauer,
        dictionary
    );
}
}


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

Foam::twoPhaseChangeModels::SchnerrSauer::SchnerrSauer
(
    const immiscibleIncompressibleTwoPhaseMixture& mixture
)
:
    cavitationModel(typeName, mixture),

    n_("n", dimless/dimVolume, twoPhaseChangeModelCoeffs_),
    dNuc_("dNuc", dimLength, twoPhaseChangeModelCoeffs_),
    Cc_("Cc", dimless, twoPhaseChangeModelCoeffs_),
    Cv_("Cv", dimless, twoPhaseChangeModelCoeffs_),

    p0_("0", pSat().dimensions(), 0.0)
{
    correct();
}


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

Foam::tmp<Foam::volScalarField>
Foam::twoPhaseChangeModels::SchnerrSauer::rRb
(
    const volScalarField& limitedAlpha1
) const
{
    return pow
    (
        ((4*constant::mathematical::pi*n_)/3)
       *limitedAlpha1/(1.0 + alphaNuc() - limitedAlpha1),
        1.0/3.0
    );
}


Foam::dimensionedScalar
Foam::twoPhaseChangeModels::SchnerrSauer::alphaNuc() const
{
    dimensionedScalar Vnuc = n_*constant::mathematical::pi*pow3(dNuc_)/6;
    return Vnuc/(1 + Vnuc);
}


Foam::tmp<Foam::volScalarField>
Foam::twoPhaseChangeModels::SchnerrSauer::pCoeff
(
    const volScalarField& p
) const
{
    const volScalarField limitedAlpha1
    (
        min(max(mixture_.alpha1(), scalar(0)), scalar(1))
    );

    const volScalarField rho
    (
        limitedAlpha1*mixture_.rho1()
      + (scalar(1) - limitedAlpha1)*mixture_.rho2()
    );

    return
        (3*mixture_.rho1()*mixture_.rho2())*sqrt(2/(3*mixture_.rho1()))
       *rRb(limitedAlpha1)/(rho*sqrt(mag(p - pSat()) + 0.01*pSat()));
}


Foam::Pair<Foam::tmp<Foam::volScalarField>>
Foam::twoPhaseChangeModels::SchnerrSauer::mDotAlphal() const
{
    const volScalarField& p =
        mixture_.U().db().lookupObject<volScalarField>("p");

    const volScalarField pCoeff(this->pCoeff(p));

    const volScalarField limitedAlpha1
    (
        min(max(mixture_.alpha1(), scalar(0)), scalar(1))
    );

    return Pair<tmp<volScalarField>>
    (
        Cc_*limitedAlpha1*pCoeff*max(p - pSat(), p0_),

        Cv_*(1.0 + alphaNuc() - limitedAlpha1)*pCoeff*min(p - pSat(), p0_)
    );
}


Foam::Pair<Foam::tmp<Foam::volScalarField>>
Foam::twoPhaseChangeModels::SchnerrSauer::mDotP() const
{
    const volScalarField& p =
        mixture_.U().db().lookupObject<volScalarField>("p");

    const volScalarField pCoeff(this->pCoeff(p));

    const volScalarField limitedAlpha1
    (
        min(max(mixture_.alpha1(), scalar(0)), scalar(1))
    );

    const volScalarField apCoeff(limitedAlpha1*pCoeff);

    return Pair<tmp<volScalarField>>
    (
        Cc_*(1.0 - limitedAlpha1)*pos0(p - pSat())*apCoeff,

        (-Cv_)*(1.0 + alphaNuc() - limitedAlpha1)*neg(p - pSat())*apCoeff
    );
}


void Foam::twoPhaseChangeModels::SchnerrSauer::correct()
{
    cavitationModel::correct();
}


bool Foam::twoPhaseChangeModels::SchnerrSauer::read()
{
    if (cavitationModel::read())
    {
        twoPhaseChangeModelCoeffs_ = optionalSubDict(type() + "Coeffs");

        twoPhaseChangeModelCoeffs_.lookup("n") >> n_;
        twoPhaseChangeModelCoeffs_.lookup("dNuc") >> dNuc_;
        twoPhaseChangeModelCoeffs_.lookup("Cc") >> Cc_;
        twoPhaseChangeModelCoeffs_.lookup("Cv") >> Cv_;

        return true;
    }
    else
    {
        return false;
    }
}


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