SyamlalOBrien.C

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    Copyright (C) 2011-2017 OpenFOAM Foundation
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
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    for more details.
 
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#include "SyamlalOBrien.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& interfaceDict,
    const phaseModel& phase1,
    const phaseModel& phase2
)
:
    dragModel(interfaceDict, phase1, phase2)
{}
 
 
// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
Foam::dragModels::SyamlalOBrien::~SyamlalOBrien()
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
Foam::tmp<Foam::volScalarField> Foam::dragModels::SyamlalOBrien::K
(
    const volScalarField& Ur
) const
{
    volScalarField alpha2(max(phase2_, scalar(1.0e-6)));
    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(max(Ur*phase1_.d()/phase2_.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*phase2_.rho()*Ur/(phase1_.d()*sqr(Vr));
}
 
 
// ************************************************************************* //