FreeFOAM The Cross-Platform CFD Toolkit
vanDriestDelta.C
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25 
26 #include "vanDriestDelta.H"
32 
33 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
34 
35 namespace Foam
36 {
37 namespace compressible
38 {
39 namespace LESModels
40 {
41 
42 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
43 
44 defineTypeNameAndDebug(vanDriestDelta, 0);
45 addToRunTimeSelectionTable(LESdelta, vanDriestDelta, dictionary);
46 
47 // * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
48 
49 void vanDriestDelta::calcDelta()
50 {
51  const LESModel& lesModel = mesh_.lookupObject<LESModel>("LESProperties");
52 
53  const volVectorField& U = lesModel.U();
54  const volScalarField& rho = lesModel.rho();
55  const volScalarField& mu = lesModel.mu();
56  tmp<volScalarField> muSgs = lesModel.muSgs();
57 
58  volScalarField ystar
59  (
60  IOobject
61  (
62  "ystar",
63  mesh_.time().constant(),
64  mesh_
65  ),
66  mesh_,
67  dimensionedScalar("ystar", dimLength, GREAT)
68  );
69 
70  const fvPatchList& patches = mesh_.boundary();
71  forAll(patches, patchi)
72  {
73  if (isA<wallFvPatch>(patches[patchi]))
74  {
75  const fvPatchVectorField& Uw = U.boundaryField()[patchi];
76  const scalarField& rhow = rho.boundaryField()[patchi];
77  const scalarField& muw = mu.boundaryField()[patchi];
78  const scalarField& muSgsw = muSgs().boundaryField()[patchi];
79 
80  ystar.boundaryField()[patchi] =
81  muw/(rhow*sqrt((muw + muSgsw)*mag(Uw.snGrad())/rhow + VSMALL));
82  }
83  }
84 
86  wallDistData<wallPointYPlus> y(mesh_, ystar);
87 
88  delta_ = min
89  (
90  static_cast<const volScalarField&>(geometricDelta_()),
91  (kappa_/Cdelta_)*((scalar(1) + SMALL) - exp(-y/ystar/Aplus_))*y
92  );
93 }
94 
95 
96 // * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
97 
98 vanDriestDelta::vanDriestDelta
99 (
100  const word& name,
101  const fvMesh& mesh,
102  const dictionary& dd
103 )
104 :
105  LESdelta(name, mesh),
106  geometricDelta_
107  (
108  LESdelta::New("geometricDelta", mesh, dd.subDict(type() + "Coeffs"))
109  ),
110  kappa_(dd.lookupOrDefault<scalar>("kappa", 0.41)),
111  Aplus_
112  (
113  dd.subDict(type() + "Coeffs").lookupOrDefault<scalar>("Aplus", 26.0)
114  ),
115  Cdelta_
116  (
117  dd.subDict(type() + "Coeffs").lookupOrDefault<scalar>("Cdelta", 0.158)
118  ),
119  calcInterval_
120  (
121  dd.subDict(type() + "Coeffs").lookupOrDefault<label>("calcInterval", 1)
122  )
123 {
124  delta_ = geometricDelta_();
125 }
126 
127 
128 // * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
129 
130 void vanDriestDelta::read(const dictionary& d)
131 {
132  const dictionary& dd(d.subDict(type() + "Coeffs"));
133 
134  geometricDelta_().read(dd);
135  d.readIfPresent<scalar>("kappa", kappa_);
136  dd.readIfPresent<scalar>("Aplus", Aplus_);
137  dd.readIfPresent<scalar>("Cdelta", Cdelta_);
138  dd.readIfPresent<label>("calcInterval", calcInterval_);
139  calcDelta();
140 }
141 
142 
144 {
145  if (mesh().time().timeIndex() % calcInterval_ == 0)
146  {
147  geometricDelta_().correct();
148  calcDelta();
149  }
150 }
151 
152 
153 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
154 
155 } // End namespace LESModels
156 } // End namespace compressible
157 } // End namespace Foam
158 
159 // ************************ vim: set sw=4 sts=4 et: ************************ //