/*---------------------------------------------------------------------------*\
  ==  == ====== ====   ====    |
                    \\     ||  | Multiphase Code Repository by HZDR
  ======   //   ||  || ===//   | Website: https://doi.org/10.14278/rodare.767
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-------------------------------------------------------------------------------
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

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    computational fluid dynamics (CFD) from the OpenFOAM Foundation.
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#include "shearUnderResolution.H"
#include "phaseSystem.H"
#include "fvcGrad.H"
#include "addonFvcSpread.H"
#include "addToRunTimeSelectionTable.H"

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

namespace Foam
{
namespace underResolutionModels
{
    defineTypeNameAndDebug(shearUnderResolution, 0);
    addToRunTimeSelectionTable
    (
        underResolutionModel,
        shearUnderResolution,
        dictionary
    );
}
}


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

Foam::tmp<Foam::volScalarField>
Foam::underResolutionModels::shearUnderResolution::nuI
() const
{
    return
        0.5
       *(
            interface_.phase1().fluidThermo().nu()
          + interface_.phase2().fluidThermo().nu()
        );
}


Foam::tmp<Foam::volScalarField>
Foam::underResolutionModels::shearUnderResolution::shearInterface
() const
{
    const volVectorField gradAlpha(interface_.gradAlpha());

    tmp<volScalarField> tShearInterface
    (
        new volScalarField
        (
            IOobject
            (
                IOobject::groupName("shearInterface", interface_.name()),
                mesh_.time().name(),
                mesh_
            ),
            mag(UrI() ^ gradAlpha)
           /max
            (
                mag(UrI())*mag(gradAlpha),
                dimensionedScalar(inv(dimTime), small)
            )
        )
    );

    return tShearInterface;
}


Foam::tmp<Foam::volScalarField>
Foam::underResolutionModels::shearUnderResolution::yPlusI
() const
{
    const volScalarField invLStarI(sqrt(mag(UrI() ^ gradAlphaI())/nuI()));

    tmp<volScalarField> tYPlusI
    (
        new volScalarField
        (
            IOobject
            (
                IOobject::groupName("yPlusI", interface_.name()),
                mesh_.time().name(),
                mesh_
            ),
            invLStarI/max(mag(gradAlphaI()), interface_.fluid().deltaN())
        )
    );

    return tYPlusI;
}


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

Foam::underResolutionModels::shearUnderResolution::shearUnderResolution
(
    const dictionary& dict,
    const phaseInterface& interface,
    const bool registerObject
)
:
    underResolutionModel(dict, interface, registerObject),

    func_(Function1<scalar>::New("func", {dimless, dimless}, dict))
{
    underResolution_.rename
    (
        IOobject::groupName("shearUnderResolution", interface.name())
    );
}


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

Foam::underResolutionModels::shearUnderResolution::~shearUnderResolution()
{}


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

void Foam::underResolutionModels::shearUnderResolution::correct()
{
    underResolutionModel::correct();

    tmp<volScalarField> func
    (
        volScalarField::New("func", mesh_, dimensionedScalar(dimless, Zero))
    );
    func.ref().primitiveFieldRef() = func_->value(yPlusI());

    underResolution_ = shearInterface()*max(min(func, scalar(1.0)), Zero);
    smoothen(underResolution_, 1);

    if (debug & mesh_.time().writeTime()) underResolution_.write();
}


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