/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2023 OpenFOAM Foundation
     \\/     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 "twoPhaseVoFSolver.H"
#include "localEulerDdtScheme.H"
#include "fvcAverage.H"

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

namespace Foam
{
namespace solvers
{
    defineTypeNameAndDebug(twoPhaseVoFSolver, 0);
}
}


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

void Foam::solvers::twoPhaseVoFSolver::correctCoNum()
{
    VoFSolver::correctCoNum();

    const scalarField sumPhi
    (
        interface.nearInterface()().primitiveField()
       *fvc::surfaceSum(mag(phi))().primitiveField()
    );

    alphaCoNum = 0.5*gMax(sumPhi/mesh.V().field())*runTime.deltaTValue();

    const scalar meanAlphaCoNum =
        0.5*(gSum(sumPhi)/gSum(mesh.V().field()))*runTime.deltaTValue();

    Info<< "Interface Courant Number mean: " << meanAlphaCoNum
        << " max: " << alphaCoNum << endl;
}


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

void Foam::solvers::twoPhaseVoFSolver::correctInterface()
{
    interface.correct();
}


Foam::tmp<Foam::surfaceScalarField>
Foam::solvers::twoPhaseVoFSolver::surfaceTensionForce() const
{
    return interface.surfaceTensionForce();
}


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

Foam::solvers::twoPhaseVoFSolver::twoPhaseVoFSolver
(
    fvMesh& mesh,
    autoPtr<twoPhaseVoFMixture> mixturePtr
)
:
    VoFSolver(mesh, autoPtr<VoFMixture>(mixturePtr.ptr())),

    mixture(refCast<twoPhaseVoFMixture>(VoFSolver::mixture)),

    alpha1(mixture.alpha1()),
    alpha2(mixture.alpha2()),

    alphaRestart
    (
        typeIOobject<surfaceScalarField>
        (
            IOobject::groupName("alphaPhi", alpha1.group()),
            runTime.name(),
            mesh,
            IOobject::READ_IF_PRESENT,
            IOobject::AUTO_WRITE
        ).headerOk()
    ),

    interface(mixture, alpha1, alpha2, U),

    alphaPhi1
    (
        IOobject
        (
            IOobject::groupName("alphaPhi", alpha1.group()),
            runTime.name(),
            mesh,
            IOobject::READ_IF_PRESENT,
            IOobject::AUTO_WRITE
        ),
        phi*fvc::interpolate(alpha1)
    )
{
    mesh.schemes().setFluxRequired(alpha1.name());

    if (alphaRestart)
    {
        Info << "Restarting alpha" << endl;
    }

    if (transient())
    {
        correctCoNum();
    }
}


// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //

Foam::solvers::twoPhaseVoFSolver::~twoPhaseVoFSolver()
{}


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

void Foam::solvers::twoPhaseVoFSolver::preSolve()
{
    VoFSolver::preSolve();

    // Do not apply previous time-step mesh compression flux
    // if the mesh topology changed
    if (mesh().topoChanged())
    {
        talphaPhi1Corr0.clear();
    }
}


void Foam::solvers::twoPhaseVoFSolver::prePredictor()
{
    VoFSolver::prePredictor();

    alphaPredictor();
}


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