GidaspowSchillerNaumann.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | Copyright (C) 1991-2011 OpenCFD Ltd.
     \\/     M anipulation  |
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License
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#include "GidaspowSchillerNaumann.H"
#include <OpenFOAM/addToRunTimeSelectionTable.H>

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

namespace Foam
{
    defineTypeNameAndDebug(GidaspowSchillerNaumann, 0);

    addToRunTimeSelectionTable
    (
        dragModel,
        GidaspowSchillerNaumann,
        dictionary
    );
}


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

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


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

Foam::GidaspowSchillerNaumann::~GidaspowSchillerNaumann()
{}


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

Foam::tmp<Foam::volScalarField> Foam::GidaspowSchillerNaumann::K
(
    const volScalarField& Ur
) const
{
    volScalarField beta = max(scalar(1) - alpha_, scalar(1e-6));
    volScalarField bp = pow(beta, -2.65);

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

    volScalarField Cds =
        neg(Re - 1000)*(24.0*(1.0 + 0.15*pow(Re, 0.687))/Re)
      + pos(Re - 1000)*0.44;

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


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