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  const scalar TFactorFluid = maxCo/(CoNum + SMALL);
42  const scalar TFactorFilm = maxCo/(surfaceFilm.CourantNumber() + SMALL);
43 
44  const scalar dt0 = runTime.deltaTValue();
45 
46  runTime.setDeltaT
47  (
48  min
49  (
50  dt0*min(min(TFactorFluid, TFactorFilm), 1.2),
51  maxDeltaT
52  )
53  );
54 }
55 
56 
57 // ************************************************************************* //
scalar maxDeltaT
scalar CoNum
scalar maxCo
dimensioned< Type > min(const dimensioned< Type > &, const dimensioned< Type > &)
filmModelType & surfaceFilm
bool adjustTimeStep