IshiiZuber.C

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    Copyright (C) 2014-2018 OpenFOAM Foundation
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
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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
{
    const volScalarField Re(pair_.Re());
    const volScalarField Eo(pair_.Eo());
 
    const volScalarField mud(pair_.dispersed().mu());
    const volScalarField muc(pair_.continuous().mu());
 
    const volScalarField muStar((mud + 0.4*muc)/(mud + muc));
 
    const volScalarField muMix
    (
        muc*pow(max(1 - pair_.dispersed(), scalar(1e-3)), -2.5*muStar)
    );
 
    const volScalarField ReM(Re*muc/muMix);
    const volScalarField CdRe
    (
        pos0(1000 - ReM)*24*(scalar(1) + 0.1*pow(ReM, 0.75))
      + neg(1000 - ReM)*0.44*ReM
    );
 
    volScalarField F((muc/muMix)*sqrt(1 - pair_.dispersed()));
    F.max(1e-3);
 
    const volScalarField Ealpha((1 + 17.67*pow(F, 0.8571428))/(18.67*F));
 
    const volScalarField CdReEllipse(Ealpha*0.6666*sqrt(Eo)*Re);
 
    return
        pos0(CdReEllipse - CdRe)
       *min(CdReEllipse, Re*sqr(1 - pair_.dispersed())*2.66667)
      + neg(CdReEllipse - CdRe)*CdRe;
}
 
 
// ************************************************************************* //