68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | foam-extend: Open Source CFD
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\\ / O peration | Version: 4.0
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\\ / A nd | Web: http://www.foam-extend.org
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\\/ M anipulation | For copyright notice see file Copyright
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-------------------------------------------------------------------------------
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License
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This file is part of foam-extend.
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foam-extend 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 3 of the License, or (at your
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option) any later version.
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foam-extend is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License 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 foam-extend. If not, see <http://www.gnu.org/licenses/>.
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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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