FreeFOAM The Cross-Platform CFD Toolkit
Smagorinsky.C
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24 \*---------------------------------------------------------------------------*/
25 
26 #include "Smagorinsky.H"
28 
29 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
30 
31 namespace Foam
32 {
33 namespace compressible
34 {
35 namespace LESModels
36 {
37 
38 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
39 
40 defineTypeNameAndDebug(Smagorinsky, 0);
41 addToRunTimeSelectionTable(LESModel, Smagorinsky, dictionary);
42 
43 
44 // * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
45 
46 void Smagorinsky::updateSubGridScaleFields(const volTensorField& gradU)
47 {
48  volSymmTensorField D = symm(gradU);
49 
50  volScalarField a = ce_/delta();
51  volScalarField b = (2.0/3.0)*tr(D);
52  volScalarField c = 2*ck_*delta()*(dev(D) && D);
53 
54  k_ = sqr((-b + sqrt(sqr(b) + 4*a*c))/(2*a));
55 
56  muSgs_ = ck_*rho()*delta()*sqrt(k_);
57  muSgs_.correctBoundaryConditions();
58 
59  alphaSgs_ = muSgs_/Prt_;
60  alphaSgs_.correctBoundaryConditions();
61 }
62 
63 
64 // * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
65 
66 Smagorinsky::Smagorinsky
67 (
68  const volScalarField& rho,
69  const volVectorField& U,
70  const surfaceScalarField& phi,
71  const basicThermo& thermoPhysicalModel
72 )
73 :
74  LESModel(typeName, rho, U, phi, thermoPhysicalModel),
75  GenEddyVisc(rho, U, phi, thermoPhysicalModel),
76 
77  ck_
78  (
80  (
81  "ck",
82  coeffDict_,
83  0.02
84  )
85  )
86 {
87  updateSubGridScaleFields(fvc::grad(U));
88 
89  printCoeffs();
90 }
91 
92 
93 // * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
94 
96 {
97  GenEddyVisc::correct(gradU);
98  updateSubGridScaleFields(gradU());
99 }
100 
101 
102 bool Smagorinsky::read()
103 {
104  if (GenEddyVisc::read())
105  {
106  ck_.readIfPresent(coeffDict());
107 
108  return true;
109  }
110  else
111  {
112  return false;
113  }
114 }
115 
116 
117 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
118 
119 } // End namespace LESModels
120 } // End namespace compressible
121 } // End namespace Foam
122 
123 // ************************ vim: set sw=4 sts=4 et: ************************ //