vanDriestDelta.C
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25 
26 #include "vanDriestDelta.H"
27 #include "wallFvPatch.H"
28 #include "wallDistData.H"
29 #include "wallPointYPlus.H"
31 
32 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
33 
34 namespace Foam
35 {
36 namespace LESModels
37 {
38  defineTypeNameAndDebug(vanDriestDelta, 0);
39  addToRunTimeSelectionTable(LESdelta, vanDriestDelta, dictionary);
40 }
41 }
42 
43 // * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
44 
45 void Foam::LESModels::vanDriestDelta::calcDelta()
46 {
47  const fvMesh& mesh = turbulenceModel_.mesh();
48 
49  const volVectorField& U = turbulenceModel_.U();
50  const tmp<volScalarField> tnu = turbulenceModel_.nu();
51  const volScalarField& nu = tnu();
52  tmp<volScalarField> nuSgs = turbulenceModel_.nut();
53 
54  volScalarField ystar
55  (
56  IOobject
57  (
58  "ystar",
59  mesh.time().constant(),
60  mesh
61  ),
62  mesh,
63  dimensionedScalar("ystar", dimLength, great)
64  );
65 
66  const fvPatchList& patches = mesh.boundary();
67  volScalarField::Boundary& ystarBf = ystar.boundaryFieldRef();
68 
69  forAll(patches, patchi)
70  {
71  if (isA<wallFvPatch>(patches[patchi]))
72  {
73  const fvPatchVectorField& Uw = U.boundaryField()[patchi];
74  const scalarField& nuw = nu.boundaryField()[patchi];
75  const scalarField& nuSgsw = nuSgs().boundaryField()[patchi];
76 
77  ystarBf[patchi] =
78  nuw/sqrt((nuw + nuSgsw)*mag(Uw.snGrad()) + vSmall);
79  }
80  }
81 
82  scalar cutOff = wallPointYPlus::yPlusCutOff;
84  wallDistData<wallPointYPlus> y(mesh, ystar);
86 
87  delta_ = min
88  (
89  static_cast<const volScalarField&>(geometricDelta_()),
90  (kappa_/Cdelta_)*((scalar(1) + small) - exp(-y/ystar/Aplus_))*y
91  );
92 }
93 
94 
95 // * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
96 
97 Foam::LESModels::vanDriestDelta::vanDriestDelta
98 (
99  const word& name,
100  const turbulenceModel& turbulence,
101  const dictionary& dict
102 )
103 :
104  LESdelta(name, turbulence),
105  geometricDelta_
106  (
108  (
109  IOobject::groupName("geometricDelta", turbulence.U().group()),
110  turbulence,
111  dict.optionalSubDict(type() + "Coeffs")
112  )
113  ),
114  kappa_(dict.lookupOrDefault<scalar>("kappa", 0.41)),
115  Aplus_
116  (
117  dict.optionalSubDict(type() + "Coeffs").lookupOrDefault<scalar>
118  (
119  "Aplus",
120  26.0
121  )
122  ),
123  Cdelta_
124  (
125  dict.optionalSubDict(type() + "Coeffs").lookupOrDefault<scalar>
126  (
127  "Cdelta",
128  0.158
129  )
130  ),
131  calcInterval_
132  (
133  dict.optionalSubDict(type() + "Coeffs").lookupOrDefault<label>
134  (
135  "calcInterval",
136  1
137  )
138  )
139 {
140  delta_ = geometricDelta_();
141 }
142 
143 
144 // * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
145 
147 {
148  const dictionary& coeffsDict(dict.optionalSubDict(type() + "Coeffs"));
149 
150  geometricDelta_().read(coeffsDict);
151  dict.readIfPresent<scalar>("kappa", kappa_);
152  coeffsDict.readIfPresent<scalar>("Aplus", Aplus_);
153  coeffsDict.readIfPresent<scalar>("Cdelta", Cdelta_);
154  coeffsDict.readIfPresent<label>("calcInterval", calcInterval_);
155 
156  calcDelta();
157 }
158 
159 
161 {
162  if (turbulenceModel_.mesh().time().timeIndex() % calcInterval_ == 0)
163  {
164  geometricDelta_().correct();
165  calcDelta();
166  }
167 }
168 
169 
170 // ************************************************************************* //
static word group(const word &name)
Return group (extension part of name)
Definition: IOobject.C:176
bool read(Istream &)
Read dictionary from Istream.
Definition: dictionaryIO.C:125
#define forAll(list, i)
Loop across all elements in list.
Definition: UList.H:428
intWM_LABEL_SIZE_t label
A label is an int32_t or int64_t as specified by the pre-processor macro WM_LABEL_SIZE.
Definition: label.H:59
fvPatchField< vector > fvPatchVectorField
addToRunTimeSelectionTable(LESfluidThermoCompressibleTurbulenceModel, SmagorinskyLESfluidThermoCompressibleTurbulenceModel, dictionary)
const volVectorField & U() const
Access function to velocity field.
A list of keyword definitions, which are a keyword followed by any number of values (e...
Definition: dictionary.H:137
Abstract base class for LES deltas.
Definition: LESdelta.H:50
dimensionedScalar sqrt(const dimensionedScalar &ds)
GeometricField< vector, fvPatchField, volMesh > volVectorField
Definition: volFieldsFwd.H:55
Abstract base class for turbulence models (RAS, LES and laminar).
Macros for easy insertion into run-time selection tables.
GeometricField< scalar, fvPatchField, volMesh > volScalarField
Definition: volFieldsFwd.H:52
scalar y
dynamicFvMesh & mesh
dimensionedScalar exp(const dimensionedScalar &ds)
const dictionary & optionalSubDict(const word &) const
Find and return a sub-dictionary if found.
Definition: dictionary.C:759
A class for handling words, derived from string.
Definition: word.H:59
Field< scalar > scalarField
Specialisation of Field<T> for scalar.
static word groupName(Name name, const word &group)
bool readIfPresent(const word &, T &, bool recursive=false, bool patternMatch=true) const
Find an entry if present, and assign to T.
static autoPtr< LESdelta > New(const word &name, const turbulenceModel &turbulence, const dictionary &dict)
Return a reference to the selected LES delta.
Definition: LESdelta.C:66
dimensioned< Type > min(const dimensioned< Type > &, const dimensioned< Type > &)
fileName::Type type(const fileName &, const bool followLink=true)
Return the file type: DIRECTORY or FILE.
Definition: POSIX.C:481
defineTypeNameAndDebug(cubeRootVolDelta, 0)
PtrList< fvPatch > fvPatchList
container classes for fvPatch
Definition: fvPatchList.H:45
label patchi
T lookupOrDefault(const word &, const T &, bool recursive=false, bool patternMatch=true) const
Find and return a T,.
const dimensionSet dimLength(0, 1, 0, 0, 0, 0, 0)
Definition: dimensionSets.H:50
dimensioned< scalar > dimensionedScalar
Dimensioned scalar obtained from generic dimensioned type.
static scalar yPlusCutOff
cut-off value for y+
virtual void read(const dictionary &)
Read the LESdelta dictionary.
dimensioned< scalar > mag(const dimensioned< Type > &)
Namespace for OpenFOAM.