twoPhaseEulerFoam: Correction to GidaspowErgunWenYu drag model
[OpenFOAM-1.7.x.git] / applications / solvers / multiphase / twoPhaseEulerFoam / interfacialModels / dragModels / GidaspowErgunWenYu / GidaspowErgunWenYu.C
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1 /*---------------------------------------------------------------------------*\
2   =========                 |
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7 -------------------------------------------------------------------------------
8 License
9     This file is part of OpenFOAM.
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24 \*---------------------------------------------------------------------------*/
26 #include "GidaspowErgunWenYu.H"
27 #include "addToRunTimeSelectionTable.H"
29 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
31 namespace Foam
33     defineTypeNameAndDebug(GidaspowErgunWenYu, 0);
35     addToRunTimeSelectionTable
36     (
37         dragModel,
38         GidaspowErgunWenYu,
39         dictionary
40     );
44 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
46 Foam::GidaspowErgunWenYu::GidaspowErgunWenYu
48     const dictionary& interfaceDict,
49     const volScalarField& alpha,
50     const phaseModel& phasea,
51     const phaseModel& phaseb
54     dragModel(interfaceDict, alpha, phasea, phaseb)
58 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
60 Foam::GidaspowErgunWenYu::~GidaspowErgunWenYu()
64 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
66 Foam::tmp<Foam::volScalarField> Foam::GidaspowErgunWenYu::K
68     const volScalarField& Ur
69 ) const
71     volScalarField beta = max(scalar(1) - alpha_, scalar(1.0e-6));
73     volScalarField bp = pow(beta, -2.65);
74     volScalarField Re = max(Ur*phasea_.d()/phaseb_.nu(), scalar(1.0e-3));
76     volScalarField Cds =
77         neg(Re - 1000)*(24.0*(1.0 + 0.15*pow(Re, 0.687))/Re)
78       + pos(Re - 1000)*0.44;
80     // Wen and Yu (1966)
81     return
82         pos(beta - 0.8)
83        *(0.75*Cds*phaseb_.rho()*Ur*bp/phasea_.d())
84       + neg(beta - 0.8)
85        *(
86            150.0*alpha_*phaseb_.nu()*phaseb_.rho()/(sqr(beta*phasea_.d()))
87          + 1.75*phaseb_.rho()*Ur/(beta*phasea_.d())
88         );
92 // ************************************************************************* //