SchnerrSauer.C

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    Copyright (C) 2011-2017 OpenFOAM Foundation
    Copyright (C) 2019 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
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#include "SchnerrSauer.H"
#include "mathematicalConstants.H"
#include "addToRunTimeSelectionTable.H"

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

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


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

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

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

    p0_(pSat().dimensions(), Zero)
{
    correct();
}


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

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


Foam::tmp<Foam::volScalarField>
Foam::phaseChangeTwoPhaseMixtures::SchnerrSauer::pCoeff
(
    const volScalarField& p
) const
{
    volScalarField limitedAlpha1(clamp(alpha1_, zero_one{}));
    volScalarField rho
    (
        limitedAlpha1*rho1() + (scalar(1) - limitedAlpha1)*rho2()
    );

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


Foam::Pair<Foam::tmp<Foam::volScalarField>>
Foam::phaseChangeTwoPhaseMixtures::SchnerrSauer::mDotAlphal() const
{
    const volScalarField& p = alpha1_.db().lookupObject<volScalarField>("p");
    volScalarField pCoeff(this->pCoeff(p));

    volScalarField limitedAlpha1(clamp(alpha1_, zero_one{}));

    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::phaseChangeTwoPhaseMixtures::SchnerrSauer::mDotP() const
{
    const volScalarField& p = alpha1_.db().lookupObject<volScalarField>("p");
    volScalarField pCoeff(this->pCoeff(p));

    volScalarField limitedAlpha1(clamp(alpha1_, zero_one{}));
    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::phaseChangeTwoPhaseMixtures::SchnerrSauer::correct()
{}


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

        phaseChangeTwoPhaseMixtureCoeffs_.readEntry("n", n_);
        phaseChangeTwoPhaseMixtureCoeffs_.readEntry("dNuc", dNuc_);
        phaseChangeTwoPhaseMixtureCoeffs_.readEntry("Cc", Cc_);
        phaseChangeTwoPhaseMixtureCoeffs_.readEntry("Cv", Cv_);

        return true;
    }

    return false;
}


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