/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 1991-2010 OpenCFD Ltd.
     \\/     M anipulation  |
-------------------------------------------------------------------------------
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
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

\*---------------------------------------------------------------------------*/

#include "Kunz.H"
#include <OpenFOAM/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,
    const word& alpha1Name
)
:
    phaseChangeTwoPhaseMixture(typeName, U, phi, alpha1Name),

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

    p0_("0", pSat().dimensions(), 0.0),

    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 = min(max(alpha1_, scalar(0)), scalar(1));

    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 = min(max(alpha1_, scalar(0)), scalar(1));

    return Pair<tmp<volScalarField> >
    (
        mcCoeff_*sqr(limitedAlpha1)*(1.0 - limitedAlpha1)
       *pos(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_ = subDict(type() + "Coeffs");

        phaseChangeTwoPhaseMixtureCoeffs_.lookup("UInf") >> UInf_;
        phaseChangeTwoPhaseMixtureCoeffs_.lookup("tInf") >> tInf_;
        phaseChangeTwoPhaseMixtureCoeffs_.lookup("Cc") >> Cc_;
        phaseChangeTwoPhaseMixtureCoeffs_.lookup("Cv") >> Cv_;

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

        return true;
    }
    else
    {
        return false;
    }
}


// ************************ vim: set sw=4 sts=4 et: ************************ //
