setMultiRegionDeltaT.H
Go to the documentation of this file.
1/*---------------------------------------------------------------------------*\
2 ========= |
3 \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
4 \\ / O peration |
5 \\ / A nd | www.openfoam.com
6 \\/ M anipulation |
7-------------------------------------------------------------------------------
8 Copyright (C) 2011 OpenFOAM Foundation
9-------------------------------------------------------------------------------
10License
11 This file is part of OpenFOAM.
12
13 OpenFOAM is free software: you can redistribute it and/or modify it
14 under the terms of the GNU General Public License as published by
15 the Free Software Foundation, either version 3 of the License, or
16 (at your option) any later version.
17
18 OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
19 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
20 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
21 for more details.
22
23 You should have received a copy of the GNU General Public License
24 along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
25
26Global
27 setMultiRegionDeltaT
28
29Description
30 Reset the timestep to maintain a constant maximum Courant numbers.
31 Reduction of time-step is immediate, but increase is damped to avoid
32 unstable oscillations.
34\*---------------------------------------------------------------------------*/
35
37{
38 if (CoNum == -GREAT)
39 {
40 CoNum = SMALL;
41 }
42
43 if (DiNum == -GREAT)
44 {
45 DiNum = SMALL;
46 }
47
48
49 const scalar TFactorFluid = maxCo/(CoNum + SMALL);
50 const scalar TFactorSolid = maxDi/(DiNum + SMALL);
51 const scalar TFactorFilm = maxCo/(surfaceFilm.CourantNumber() + SMALL);
52
53 const scalar dt0 = runTime.deltaTValue();
54
55 runTime.setDeltaT
56 (
57 min
58 (
59 dt0*min(min(TFactorFluid, min(TFactorFilm, TFactorSolid)), 1.2),
61 )
62 );
63}
64
65
66// ************************************************************************* //
regionModels::surfaceFilmModel & surfaceFilm
scalar maxDi
scalar DiNum
engineTime & runTime
bool adjustTimeStep
scalar maxCo
scalar CoNum