69 lines
2.1 KiB
C
69 lines
2.1 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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setMultiRegionDeltaT
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Description
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Reset the timestep to maintain a constant maximum courant and diffusion
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Numbers. Reduction of time-step is immediate, 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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if (CoNum == -GREAT)
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{
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CoNum = SMALL;
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}
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if (DiNum == -GREAT)
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{
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DiNum = SMALL;
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}
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scalar maxDeltaTFluid = maxCo/(CoNum + SMALL);
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scalar maxDeltaTSolid = maxDi/(DiNum + SMALL);
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scalar deltaTFluid =
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min
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(
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min(maxDeltaTFluid, 1.0 + 0.1*maxDeltaTFluid),
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1.2
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);
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runTime.setDeltaT
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(
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min
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(
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min(deltaTFluid, maxDeltaTSolid)*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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