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

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    Website: https://hzdr.de

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

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

namespace Foam
{
namespace dragModels
{
    defineTypeNameAndDebug(PorombkaHoehne, 0);
    addToRunTimeSelectionTable(dragModel, PorombkaHoehne, dictionary);
}
}


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

Foam::tmp<Foam::volSymmTensorField> Foam::dragModels::PorombkaHoehne::tauVisc
(
    const phaseModel& phase
) const
{
    return 2*phase.fluidThermo().mu()*dev(symm(fvc::grad(phase.U())));
}


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

Foam::dragModels::PorombkaHoehne::PorombkaHoehne
(
    const dictionary& dict,
    const phaseInterface& interface,
    const bool registerObject
)
:
    dragModel(dict, interface, registerObject),
    interface_(interface.phase1(), interface.phase2()),
    LMax_("LMax", dimLength, dict, 1.0),
    residualSlip_("residualSlip", dimVelocity, dict)
{}


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

Foam::dragModels::PorombkaHoehne::~PorombkaHoehne()
{}


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

Foam::tmp<Foam::volScalarField> Foam::dragModels::PorombkaHoehne::K() const
{
    // phase normal vector
    const volVectorField alphaN(-interface_.nHat());

    // phase shear stress vectors
    const volVectorField tAlpha1(tauVisc(interface_.phase1()) & alphaN);
    const volVectorField tAlpha2(tauVisc(interface_.phase2()) & -alphaN);

    // phase shear stress parallel to the free surface
    const volScalarField magTAlpha1Fs(mag(tAlpha1 - (alphaN & tAlpha1)*alphaN));
    const volScalarField magTAlpha2Fs(mag(tAlpha2 - (alphaN & tAlpha2)*alphaN));

    return
        max
        (
            max
            (
                0.01*interface_.rho()*sqr(interface_.magUr()),
                interface_.phase1()*magTAlpha1Fs
              + interface_.phase2()*magTAlpha2Fs
            ),
            dimensionedScalar(dimensionSet(1, -1, -2, 0, 0), small)
        )
       *max(interface_.Ai(), 1/LMax_)
       /max(interface_.magUr(), residualSlip_);
}


Foam::tmp<Foam::surfaceScalarField>
Foam::dragModels::PorombkaHoehne::Kf() const
{
    return fvc::interpolate(K());
}


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