setRDeltaT.H
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25 
26 {
27  volScalarField& rDeltaT = trDeltaT();
28 
29  const dictionary& pimpleDict = pimple.dict();
30 
31  // Maximum flow Courant number
32  scalar maxCo(readScalar(pimpleDict.lookup("maxCo")));
33 
34  // Maximum time scale
35  scalar maxDeltaT(pimpleDict.lookupOrDefault<scalar>("maxDeltaT", GREAT));
36 
37  // Smoothing parameter (0-1) when smoothing iterations > 0
39  (
40  pimpleDict.lookupOrDefault<scalar>("rDeltaTSmoothingCoeff", 0.1)
41  );
42 
43  // Damping coefficient (1-0)
44  scalar rDeltaTDampingCoeff
45  (
46  pimpleDict.lookupOrDefault<scalar>("rDeltaTDampingCoeff", 1)
47  );
48 
49  // Maximum change in cell temperature per iteration
50  // (relative to previous value)
51  scalar alphaTemp(pimpleDict.lookupOrDefault("alphaTemp", 0.05));
52 
53 
54  Info<< "Time scales min/max:" << endl;
55 
56  // Cache old reciprocal time scale field
57  volScalarField rDeltaT0("rDeltaT0", rDeltaT);
58 
59  // Flow time scale
60  {
61  rDeltaT.dimensionedInternalField() =
62  (
64  /((2*maxCo)*mesh.V()*rho.dimensionedInternalField())
65  );
66 
67  // Limit the largest time scale
68  rDeltaT.max(1/maxDeltaT);
69 
70  Info<< " Flow = "
71  << gMin(1/rDeltaT.internalField()) << ", "
72  << gMax(1/rDeltaT.internalField()) << endl;
73  }
74 
75  // Reaction source time scale
76  if (alphaTemp < 1.0)
77  {
78  volScalarField::DimensionedInternalField rDeltaTT
79  (
80  mag(reaction->Sh())/(alphaTemp*rho*thermo.Cp()*T)
81  );
82 
83  Info<< " Temperature = "
84  << gMin(1/(rDeltaTT.field() + VSMALL)) << ", "
85  << gMax(1/(rDeltaTT.field() + VSMALL)) << endl;
86 
87  rDeltaT.dimensionedInternalField() = max
88  (
89  rDeltaT.dimensionedInternalField(),
90  rDeltaTT
91  );
92  }
93 
94  // Update tho boundary values of the reciprocal time-step
95  rDeltaT.correctBoundaryConditions();
96 
97  // Spatially smooth the time scale field
98  if (rDeltaTSmoothingCoeff < 1.0)
99  {
101  }
102 
103  // Limit rate of change of time scale
104  // - reduce as much as required
105  // - only increase at a fraction of old time scale
106  if
107  (
108  rDeltaTDampingCoeff < 1.0
109  && runTime.timeIndex() > runTime.startTimeIndex() + 1
110  )
111  {
112  rDeltaT = max
113  (
114  rDeltaT,
115  (scalar(1.0) - rDeltaTDampingCoeff)*rDeltaT0
116  );
117  }
118 
119  Info<< " Overall = "
120  << gMin(1/rDeltaT.internalField())
121  << ", " << gMax(1/rDeltaT.internalField()) << endl;
122 }
123 
124 
125 // ************************************************************************* //
#define readScalar
Definition: doubleScalar.C:38
dimensioned< scalar > mag(const dimensioned< Type > &)
scalar maxCo(readScalar(pimpleDict.lookup("maxCo")))
tmp< GeometricField< Type, fvPatchField, volMesh > > surfaceSum(const GeometricField< Type, fvsPatchField, surfaceMesh > &ssf)
messageStream Info
dynamicFvMesh & mesh
const dictionary & pimple
const volScalarField & T
Definition: createFields.H:25
scalar rDeltaTSmoothingCoeff(pimpleDict.lookupOrDefault< scalar >("rDeltaTSmoothingCoeff", 0.1))
Ostream & endl(Ostream &os)
Add newline and flush stream.
Definition: Ostream.H:251
GeometricField< scalar, fvPatchField, volMesh > volScalarField
Definition: volFieldsFwd.H:52
dimensioned< Type > max(const dimensioned< Type > &, const dimensioned< Type > &)
scalar alphaTemp(pimpleDict.lookupOrDefault("alphaTemp", 0.05))
volScalarField rDeltaT0("rDeltaT0", rDeltaT)
Type gMin(const FieldField< Field, Type > &f)
surfaceScalarField & phi
rDeltaT dimensionedInternalField()
tmp< volScalarField > trDeltaT
Definition: createRDeltaT.H:3
Info<< "Creating reaction model\n"<< endl;autoPtr< combustionModels::psiCombustionModel > reaction(combustionModels::psiCombustionModel::New(mesh))
scalar rDeltaTDampingCoeff(pimpleDict.lookupOrDefault< scalar >("rDeltaTDampingCoeff", 1))
psiReactionThermo & thermo
Definition: createFields.H:32
scalar maxDeltaT(pimpleDict.lookupOrDefault< scalar >("maxDeltaT", GREAT))
Type gMax(const FieldField< Field, Type > &f)
void smooth(volScalarField &field, const scalar coeff)
Definition: fvcSmooth.C:35