/*---------------------------------------------------------------------------*\
  ==  == ====== ====   ====    |
                    \\     ||  | 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.

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    Website: https://hzdr.de

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    computational fluid dynamics (CFD) from the OpenFOAM Foundation.
    Copyright (C) 2025 by OpenFOAM Foundation, Website: https://openfoam.org

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#include "entrainmentModel.H"
#include "fvcAverage.H"
#include "resolvedInterfaceSystem.H"

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

namespace Foam
{
namespace fv
{
    defineTypeNameAndDebug(entrainmentModel, 0);
    defineRunTimeSelectionTable(entrainmentModel, dictionary);
}
}


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

Foam::fv::entrainmentModel::entrainmentModel
(
    const dictionary& dict,
    const dispersedPhaseInterface& interface
)
:
    continuousPhases_(interface.fluid().resolvedInterface().continuousPhases()),
    threshold_("threshold", dimless, dict, 0.2),
    interface_(interface),
    g_(interface_.mesh().lookupObject<uniformDimensionedVectorField>("g")),

    // Different definitions of continuous and dispersed phases in release and
    // MultiMorph lead to this cross-over of names
    pairContinuous_(interface_.dispersed()),
    pairDisperse_(interface_.continuous())
{
    if (!pairContinuous_.continuous() || pairDisperse_.continuous())
    {
        FatalIOErrorInFunction(dict)
            << "Expecting a dispersed interface of "
            << "(continuous_dispersedIn_disperse) in interface "
            << interface.name() << " for " << typeName << " model."
            << exit(FatalIOError);
    }
}


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

Foam::fv::entrainmentModel::~entrainmentModel()
{}


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

Foam::tmp<Foam::volScalarField>
Foam::fv::entrainmentModel::dmdtf() const
{
    tmp<volScalarField> tDmdtf
    (
        volScalarField::New
        (
            IOobject::groupName
            (
                IOobject::groupName("dmdtf", typeName),
                interface_.name()
            ),
            pairContinuous_.mesh(),
            dimensionedScalar(dimDensity/dimTime, Zero)
        )
    );

    forAllConstIter(phaseModelPartialList, continuousPhases_, iter)
    {
        if (iter().name() == pairContinuous_.name())
        {
            continue;
        }

        tDmdtf.ref() +=
            pos0(fvc::average(*iter) - threshold_)
           *pos0(pairContinuous_ - pairContinuous_.residualAlpha())
           *max(rate(*iter), dimensionedScalar(dimDensity/dimTime, Zero));
    }

    if (debug && pairContinuous_.time().writeTime())
    {
        tDmdtf.ref().write();
    }

    return tDmdtf;
}


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