setMultiRegionDeltaT.H
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23 
24 Global
25  setMultiRegionDeltaT
26 
27 Description
28  Reset the timestep to maintain a constant maximum Courant numbers.
29  Reduction of time-step is immediate, but increase is damped to avoid
30  unstable oscillations.
31 
32 \*---------------------------------------------------------------------------*/
33 
34 if (adjustTimeStep)
35 {
36  if (CoNum == -GREAT)
37  {
38  CoNum = SMALL;
39  }
40 
41  if (DiNum == -GREAT)
42  {
43  DiNum = SMALL;
44  }
45 
46 
47  const scalar TFactorFluid = maxCo/(CoNum + SMALL);
48  const scalar TFactorSolid = maxDi/(DiNum + SMALL);
49  const scalar TFactorFilm = maxCo/(surfaceFilm.CourantNumber() + SMALL);
50 
51  const scalar dt0 = runTime.deltaTValue();
52 
53  runTime.setDeltaT
54  (
55  min
56  (
57  dt0*min(min(TFactorFluid, min(TFactorFilm, TFactorSolid)), 1.2),
58  maxDeltaT
59  )
60  );
61 }
62 
63 
64 // ************************************************************************* //
scalar DiNum
bool adjustTimeStep
scalar maxDeltaT
scalar maxDi
scalar CoNum
filmModelType & surfaceFilm
dimensioned< Type > min(const dimensioned< Type > &, const dimensioned< Type > &)
scalar maxCo