SyamlalOBrien.C

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    Copyright (C) 2011-2018 OpenFOAM Foundation
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
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#include "SyamlalOBrien.H"
#include "phasePair.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 phasePair& pair,
    const bool registerObject
)
:
    dragModel(dict, pair, registerObject)
{}
 
 
// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
Foam::dragModels::SyamlalOBrien::~SyamlalOBrien()
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
Foam::tmp<Foam::volScalarField> Foam::dragModels::SyamlalOBrien::CdRe() const
{
    volScalarField alpha2
    (
        max(scalar(1) - pair_.dispersed(), pair_.continuous().residualAlpha())
    );
 
    volScalarField A(pow(alpha2, 4.14));
    volScalarField B
    (
        neg(alpha2 - 0.85)*(0.8*pow(alpha2, 1.28))
      + pos0(alpha2 - 0.85)*(pow(alpha2, 2.65))
    );
    volScalarField Re(pair_.Re());
    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
       *max(pair_.continuous(), pair_.continuous().residualAlpha())
       /sqr(Vr);
}
 
 
// ************************************************************************* //