54 lines
1.9 KiB
C
54 lines
1.9 KiB
C
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright held by original author
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM; if not, write to the Free Software Foundation,
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Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Global
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setDeltaT
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Description
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Reset the timestep to maintain a constant maximum courant Number.
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Reduction of time-step is imediate but increase is damped to avoid
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unstable oscillations.
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\*---------------------------------------------------------------------------*/
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if (adjustTimeStep)
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{
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scalar maxDeltaTFact =
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min(maxCo/(CoNum + SMALL), maxAcousticCo/(acousticCoNum + SMALL));
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scalar deltaTFact = min(min(maxDeltaTFact, 1.0 + 0.1*maxDeltaTFact), 1.2);
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runTime.setDeltaT
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(
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min
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(
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deltaTFact*runTime.deltaT().value(),
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maxDeltaT
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)
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);
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Info<< "deltaT = " << runTime.deltaT().value() << endl;
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}
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// ************************************************************************* //
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