foam-extend4.1-coherent-io/applications/solvers/multiphase/twoPhaseEulerFoam/interfacialModels/dragModels/SyamlalOBrien/SyamlalOBrien.C

/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | foam-extend: Open Source CFD
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    \\  /    A nd           | For copyright notice see file Copyright
     \\/     M anipulation  |
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License
    This file is part of foam-extend.

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    WITHOUT ANY WARRANTY; without even the implied warranty of
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#include "SyamlalOBrien.H"
#include "addToRunTimeSelectionTable.H"

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

namespace Foam
{
    defineTypeNameAndDebug(SyamlalOBrien, 0);

    addToRunTimeSelectionTable
    (
        dragModel,
        SyamlalOBrien,
        dictionary
    );
}


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

Foam::SyamlalOBrien::SyamlalOBrien
(
    const dictionary& interfaceDict,
    const volScalarField& alpha,
    const phaseModel& phasea,
    const phaseModel& phaseb
)
:
    dragModel(interfaceDict, alpha, phasea, phaseb)
{}


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

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


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

Foam::tmp<Foam::volScalarField> Foam::SyamlalOBrien::K
(
    const volScalarField& Ur
) const
{
    volScalarField beta = max(scalar(1) - alpha_, scalar(1.0e-6));
    volScalarField A = pow(beta, 4.14);
    volScalarField B = 0.8*pow(beta, 1.28);

    forAll (beta, celli)
    {
        if (beta[celli] > 0.85)
        {
            B[celli] = pow(beta[celli], 2.65);
        }
    }

    volScalarField Re = max(Ur*phasea_.d()/phaseb_.nu(), scalar(1.0e-3));

    volScalarField Vr = 0.5*
    (
        A - 0.06*Re + sqrt(sqr(0.06*Re) + 0.12*Re*(2.0*B - A) + sqr(A))
    );

    volScalarField Cds = sqr(0.63 + 4.8*sqrt(Vr/Re));

    return 0.75*Cds*phaseb_.rho()*Ur/(phasea_.d()*sqr(Vr));
}


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