1 /*---------------------------------------------------------------------------*\
3 \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
5 \\ / A nd | Copyright (C) 2011 OpenFOAM Foundation
7 -------------------------------------------------------------------------------
9 This file is part of OpenFOAM.
11 OpenFOAM is free software: you can redistribute it and/or modify it
12 under the terms of the GNU General Public License as published by
13 the Free Software Foundation, either version 3 of the License, or
14 (at your option) any later version.
16 OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
17 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
21 You should have received a copy of the GNU General Public License
22 along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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.
32 \*---------------------------------------------------------------------------*/
36 scalar maxDeltaTFact =
37 min(maxCo/(CoNum + SMALL), maxAcousticCo/(acousticCoNum + SMALL));
39 scalar deltaTFact = min(min(maxDeltaTFact, 1.0 + 0.1*maxDeltaTFact), 1.2);
45 deltaTFact*runTime.deltaTValue(),
50 Info<< "deltaT = " << runTime.deltaTValue() << endl;
53 // ************************************************************************* //