setDeltaT.H
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23 
24 Global
25  setDeltaT
26 
27 Description
28  Reset the timestep to maintain a constant maximum courant Number.
29  Reduction of time-step is imediate but increase is damped to avoid
30  unstable oscillations.
31 
32 \*---------------------------------------------------------------------------*/
33 
34 if (adjustTimeStep)
35 {
36  scalar maxDeltaTFact = maxCo/(CoNum + StCoNum + SMALL);
37  scalar deltaTFact = min(min(maxDeltaTFact, 1.0 + 0.1*maxDeltaTFact), 1.2);
38 
39  runTime.setDeltaT
40  (
41  min
42  (
43  deltaTFact*runTime.deltaTValue(),
44  maxDeltaT
45  )
46  );
47 
48  Info<< "deltaT = " << runTime.deltaTValue() << endl;
49 }
50 
51 // ************************************************************************* //
bool adjustTimeStep
messageStream Info
Ostream & endl(Ostream &os)
Add newline and flush stream.
Definition: Ostream.H:251
scalar maxDeltaT
scalar CoNum
dimensioned< Type > min(const dimensioned< Type > &, const dimensioned< Type > &)
scalar maxCo