IshiiZuber.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2014 OpenFOAM Foundation
     \\/     M anipulation  |
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License
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#include "IshiiZuber.H"
#include "phasePair.H"
#include "addToRunTimeSelectionTable.H"

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

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


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

Foam::dragModels::IshiiZuber::IshiiZuber
(
    const dictionary& dict,
    const phasePair& pair,
    const bool registerObject
)
:
    dragModel(dict, pair, registerObject)
{}


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

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


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

Foam::tmp<Foam::volScalarField>
Foam::dragModels::IshiiZuber::CdRe() const
{
    volScalarField Re(pair_.Re());
    volScalarField Eo(pair_.Eo());

    volScalarField mud(pair_.dispersed().mu());
    volScalarField muc(pair_.continuous().mu());

    volScalarField muStar((mud + 0.4*muc)/(mud + muc));

    volScalarField muMix
    (
        muc
       *pow(max(1 - pair_.dispersed(), scalar(1e-3)), -2.5*muStar)
    );

    volScalarField ReM(Re*muc/muMix);
    volScalarField CdRe
    (
        pos(1000 - ReM)*24.0*(scalar(1) + 0.15*pow(ReM, 0.687))
      + neg(1000 - ReM)*0.44*ReM
    );

    volScalarField F((muc/muMix)*sqrt(1 - pair_.dispersed()));
    F.max(1e-3);

    volScalarField Ealpha((1 + 17.67*pow(F, 0.8571428))/(18.67*F));

    volScalarField CdReEllipse(Ealpha*0.6666*sqrt(Eo)*Re);

    return
        pos(CdReEllipse - CdRe)
       *min(CdReEllipse, Re*sqr(1 - pair_.dispersed())*2.66667)
      + neg(CdReEllipse - CdRe)*CdRe;
}


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