Kunz.C

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    Copyright (C) 2011-2017 OpenFOAM Foundation
    Copyright (C) 2019 OpenCFD Ltd.
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License
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#include "Kunz.H"
#include "addToRunTimeSelectionTable.H"

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

namespace Foam
{
namespace phaseChangeTwoPhaseMixtures
{
    defineTypeNameAndDebug(Kunz, 0);
    addToRunTimeSelectionTable(phaseChangeTwoPhaseMixture, Kunz, components);
}
}

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

Foam::phaseChangeTwoPhaseMixtures::Kunz::Kunz
(
    const volVectorField& U,
    const surfaceScalarField& phi
)
:
    phaseChangeTwoPhaseMixture(typeName, U, phi),

    UInf_("UInf", dimVelocity, phaseChangeTwoPhaseMixtureCoeffs_),
    tInf_("tInf", dimTime, phaseChangeTwoPhaseMixtureCoeffs_),
    Cc_("Cc", dimless, phaseChangeTwoPhaseMixtureCoeffs_),
    Cv_("Cv", dimless, phaseChangeTwoPhaseMixtureCoeffs_),

    p0_(pSat().dimensions(), Zero),

    mcCoeff_(Cc_*rho2()/tInf_),
    mvCoeff_(Cv_*rho2()/(0.5*rho1()*sqr(UInf_)*tInf_))
{
    correct();
}


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

Foam::Pair<Foam::tmp<Foam::volScalarField>>
Foam::phaseChangeTwoPhaseMixtures::Kunz::mDotAlphal() const
{
    const volScalarField& p = alpha1_.db().lookupObject<volScalarField>("p");
    volScalarField limitedAlpha1(clamp(alpha1_, zero_one{}));

    return Pair<tmp<volScalarField>>
    (
        mcCoeff_*sqr(limitedAlpha1)
       *max(p - pSat(), p0_)/max(p - pSat(), 0.01*pSat()),

        mvCoeff_*min(p - pSat(), p0_)
    );
}

Foam::Pair<Foam::tmp<Foam::volScalarField>>
Foam::phaseChangeTwoPhaseMixtures::Kunz::mDotP() const
{
    const volScalarField& p = alpha1_.db().lookupObject<volScalarField>("p");
    volScalarField limitedAlpha1(clamp(alpha1_, zero_one{}));

    return Pair<tmp<volScalarField>>
    (
        mcCoeff_*sqr(limitedAlpha1)*(1.0 - limitedAlpha1)
       *pos0(p - pSat())/max(p - pSat(), 0.01*pSat()),

        (-mvCoeff_)*limitedAlpha1*neg(p - pSat())
    );
}


void Foam::phaseChangeTwoPhaseMixtures::Kunz::correct()
{}


bool Foam::phaseChangeTwoPhaseMixtures::Kunz::read()
{
    if (phaseChangeTwoPhaseMixture::read())
    {
        phaseChangeTwoPhaseMixtureCoeffs_ = optionalSubDict(type() + "Coeffs");

        phaseChangeTwoPhaseMixtureCoeffs_.readEntry("UInf", UInf_);
        phaseChangeTwoPhaseMixtureCoeffs_.readEntry("tInf", tInf_);
        phaseChangeTwoPhaseMixtureCoeffs_.readEntry("Cc", Cc_);
        phaseChangeTwoPhaseMixtureCoeffs_.readEntry("Cv", Cv_);

        mcCoeff_ = Cc_*rho2()/tInf_;
        mvCoeff_ = Cv_*rho2()/(0.5*rho1()*sqr(UInf_)*tInf_);

        return true;
    }

    return false;
}


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