The open source CFD toolbox
setDeltaT.H
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1/*---------------------------------------------------------------------------*\
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3 \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
4 \\ / O peration |
5 \\ / A nd | www.openfoam.com
6 \\/ M anipulation |
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8 Copyright (C) 2011 OpenFOAM Foundation
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25
26Global
27 setDeltaT
28
29Description
30 Reset the timestep to maintain a constant maximum courant Number.
31 Reduction of time-step is immediate but increase is damped to avoid
32 unstable oscillations.
34\*---------------------------------------------------------------------------*/
35
37{
38 scalar maxDeltaTFact = maxCo/(CoNum + StCoNum + SMALL);
39 scalar deltaTFact = min(min(maxDeltaTFact, 1.0 + 0.1*maxDeltaTFact), 1.2);
40
41 runTime.setDeltaT
42 (
43 min
44 (
45 deltaTFact*runTime.deltaTValue(),
47 )
48 );
49
50 Info<< "deltaT = " << runTime.deltaTValue() << endl;
51}
52
53// ************************************************************************* //
engineTime & runTime