/*---------------------------------------------------------------------------*\
  ==  == ====== ====   ====    |
                    \\     ||  | Multiphase Code Repository by HZDR
  ======   //   ||  || ===//   | Website: https://doi.org/10.14278/rodare.767
  ||  ||  //    ||  // || \\   | License: GPL-3.0-or-later
  ==  == ====== ====   ==  ==  |
-------------------------------------------------------------------------------
License
    This file is part of the Multiphase Code Repository by HZDR.

    Copyright (C) 2025 by Helmholtz-Zentrum Dresden-Rossendorf e.V. (HZDR),
    Website: https://hzdr.de

    Multiphase Code Repository by HZDR is based on the free software for
    computational fluid dynamics (CFD) from the OpenFOAM Foundation.
    Copyright (C) 2025 by OpenFOAM Foundation, Website: https://openfoam.org

    If you are interested in which files are original OpenFOAM Foundation
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    newly created, see FILES.md.

    Multiphase Code Repository by HZDR is free software: you can redistribute
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\*---------------------------------------------------------------------------*/

#include "IATE.H"
#include "IATEsource.H"
#include "fvmDdt.H"
#include "fvmDiv.H"
#include "fvmSup.H"
#include "fvcDdt.H"
#include "fvcDiv.H"
#include "fvcAverage.H"
#include "fvModels.H"
#include "fvConstraints.H"
#include "mathematicalConstants.H"
#include "fundamentalConstants.H"
#include "addToRunTimeSelectionTable.H"

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

namespace Foam
{
namespace diameterModels
{
    defineTypeNameAndDebug(IATE, 0);
    addToRunTimeSelectionTable(diameterModel, IATE, dictionary);
}
}


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

Foam::tmp<Foam::volScalarField> Foam::diameterModels::IATE::dsm() const
{
    return max(6/max(kappai_, 6/dMax_), dMin_);
}


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

Foam::diameterModels::IATE::IATE
(
    const dictionary& diameterProperties,
    const phaseModel& phase
)
:
    diameterModel(diameterProperties, phase),
    kappai_
    (
        IOobject
        (
            IOobject::groupName("kappai", phase.name()),
            phase.time().name(),
            phase.mesh(),
            IOobject::MUST_READ,
            IOobject::AUTO_WRITE
        ),
        phase.mesh()
    ),
    dMax_("dMax", dimLength, diameterProperties),
    dMin_("dMin", dimLength, diameterProperties),
    residualAlpha_("residualAlpha", dimless, diameterProperties),
    d_
    (
        IOobject
        (
            IOobject::groupName("d", phase.name()),
            phase.time().name(),
            phase.mesh(),
            IOobject::NO_READ,
            IOobject::AUTO_WRITE
        ),
        dsm()
    ),
    sources_(diameterProperties.lookup("sources"), IATEsource::iNew(*this))
{}


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

Foam::diameterModels::IATE::~IATE()
{}


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

Foam::tmp<Foam::volScalarField> Foam::diameterModels::IATE::d() const
{
    return d_;
}


Foam::tmp<Foam::volScalarField> Foam::diameterModels::IATE::Av() const
{
    return phase()*kappai_;
}


void Foam::diameterModels::IATE::correct()
{
    const volScalarField& alpha = phase();
    const volScalarField& rho = phase().rho();

    volScalarField alphaAv
    (
        max
        (
            0.5*fvc::average(alpha + alpha.oldTime()),
            residualAlpha_
        )
    );

    // Initialise the accumulated source term to the dilatation effect
    fvScalarMatrix R
    (
       -fvm::SuSp
        (
            ((1.0/3.0)/alphaAv)
           *(
                (fvc::ddt(alpha) + fvc::div(phase().alphaPhi()))
              - (fvc::ddt(alpha, rho) + fvc::div(phase().alphaRhoPhi()))/rho
            ),
            kappai_
        )
    );

    // Accumulate the run-time selectable sources
    forAll(sources_, j)
    {
        R += sources_[j].R(kappai_);
    }

    const Foam::fvModels& fvModels =
        Foam::fvModels::New(phase().mesh());
    const Foam::fvConstraints& fvConstraints =
        Foam::fvConstraints::New(phase().mesh());

    // Construct the interfacial curvature equation
    fvScalarMatrix kappaiEqn
    (
        fvm::ddt(kappai_) + fvm::div(phase().phi(), kappai_)
      - fvm::Sp(fvc::div(phase().phi()), kappai_)
     ==
        R
      + fvModels.source(alpha, rho, kappai_)/(alphaAv*rho)
    );

    kappaiEqn.relax();

    fvConstraints.constrain(kappaiEqn);

    kappaiEqn.solve();

    // Update the Sauter-mean diameter
    d_ = dsm();
}


bool Foam::diameterModels::IATE::read(const dictionary& phaseProperties)
{
    diameterModel::read(phaseProperties);

    diameterProperties().lookup("dMax") >> dMax_;
    diameterProperties().lookup("dMin") >> dMin_;

    diameterProperties().lookup("residualAlpha") >> residualAlpha_;

    // Re-create all the sources updating number, type and coefficients
    PtrList<IATEsource>
    (
        diameterProperties().lookup("sources"),
        IATEsource::iNew(*this)
    ).transfer(sources_);

    return true;
}


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