/*---------------------------------------------------------------------------*\
  ==  == ====== ====   ====    |
                    \\     ||  | 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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#include "SyamlalOBrien.H"
#include "addToRunTimeSelectionTable.H"

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

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


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

Foam::dragModels::SyamlalOBrien::SyamlalOBrien
(
    const dictionary& dict,
    const phaseInterface& interface,
    const bool registerObject
)
:
    dispersedDragModel(dict, interface, registerObject)
{}


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

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


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

Foam::tmp<Foam::volScalarField> Foam::dragModels::SyamlalOBrien::CdRe() const
{
    const volScalarField alpha2
    (
        max(interface_.continuous(), interface_.continuous().residualAlpha())
    );

    const volScalarField A(pow(alpha2, 4.14));
    const volScalarField B
    (
        neg(alpha2 - 0.85)*(0.8*pow(alpha2, 1.28))
      + pos0(alpha2 - 0.85)*(pow(alpha2, 2.65))
    );
    const volScalarField Re(interface_.Re());
    const volScalarField Vr
    (
        0.5
       *(
            A - 0.06*Re + sqrt(sqr(0.06*Re) + 0.12*Re*(2*B - A) + sqr(A))
        )
    );
    volScalarField CdsRe(sqr(0.63*sqrt(Re) + 4.8*sqrt(Vr)));

    return CdsRe*alpha2/sqr(Vr);
}


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