FreeFOAM The Cross-Platform CFD Toolkit
SyamlalOBrien.C
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1 /*---------------------------------------------------------------------------*\
2  ========= |
3  \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
4  \\ / O peration |
5  \\ / A nd | Copyright (C) 1991-2011 OpenCFD Ltd.
6  \\/ M anipulation |
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10 
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24 \*---------------------------------------------------------------------------*/
25 
26 #include "SyamlalOBrien.H"
28 
29 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
30 
31 namespace Foam
32 {
33  defineTypeNameAndDebug(SyamlalOBrien, 0);
34 
36  (
37  dragModel,
38  SyamlalOBrien,
39  dictionary
40  );
41 }
42 
43 
44 // * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
45 
47 (
48  const dictionary& interfaceDict,
49  const volScalarField& alpha,
50  const phaseModel& phasea,
51  const phaseModel& phaseb
52 )
53 :
54  dragModel(interfaceDict, alpha, phasea, phaseb)
55 {}
56 
57 
58 // * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
59 
61 {}
62 
63 
64 // * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
65 
67 (
68  const volScalarField& Ur
69 ) const
70 {
71  volScalarField beta = max(scalar(1) - alpha_, scalar(1.0e-6));
72  volScalarField A = pow(beta, 4.14);
73  volScalarField B =
74  neg(beta - 0.85)*(0.8*pow(beta, 1.28))
75  + pos(beta - 0.85)*(pow(beta, 2.65));
76 
77  volScalarField Re = max(Ur*phasea_.d()/phaseb_.nu(), scalar(1.0e-3));
78 
79  volScalarField Vr = 0.5*
80  (
81  A - 0.06*Re + sqrt(sqr(0.06*Re) + 0.12*Re*(2.0*B - A) + sqr(A))
82  );
83 
84  volScalarField Cds = sqr(0.63 + 4.8*sqrt(Vr/Re));
85 
86  return 0.75*Cds*phaseb_.rho()*Ur/(phasea_.d()*sqr(Vr));
87 }
88 
89 
90 // ************************ vim: set sw=4 sts=4 et: ************************ //