557c472f07
The time step adjustment now starts from the minimum of the deltaT calculated from Courant condition (and other physical limits), and the deltaT specified in the system/controlDict. This means that a small deltaT setting in system/controlDict results in a gradual increase up to the Courant number limited value. This can be useful in maintaining stability at the start of a simulation. This functionality is an accidental side-effect at best. It is being reinstated as existing cases are reliant upon it. If additional control of the time step in the initial stages of a simulation is needed, then that should be achieved with a more explicit user control.
94 lines
2.8 KiB
C++
94 lines
2.8 KiB
C++
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration | Website: https://openfoam.org
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\\ / A nd | Copyright (C) 2022 OpenFOAM Foundation
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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
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the Free Software Foundation, either version 3 of the License, or
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(at your 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, see <http://www.gnu.org/licenses/>.
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\*---------------------------------------------------------------------------*/
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#include "setDeltaT.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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void Foam::setDeltaT(Time& runTime, const PtrList<solver>& solvers)
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{
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if
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(
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runTime.timeIndex() == 0
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&& runTime.controlDict().lookupOrDefault("adjustTimeStep", false)
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)
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{
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scalar deltaT = great;
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forAll(solvers, i)
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{
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if (solvers[i].transient())
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{
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deltaT = min(deltaT, solvers[i].maxDeltaT());
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}
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}
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if (deltaT != great)
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{
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runTime.setDeltaT(min(runTime.deltaTValue(), deltaT));
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}
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}
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}
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void Foam::adjustDeltaT(Time& runTime, const PtrList<solver>& solvers)
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{
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if (runTime.controlDict().lookupOrDefault("adjustTimeStep", false))
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{
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scalar deltaT = great;
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forAll(solvers, i)
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{
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if (solvers[i].transient())
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{
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const scalar maxDeltaTi = solvers[i].maxDeltaT();
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deltaT = min
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(
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deltaT,
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min
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(
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min
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(
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maxDeltaTi,
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runTime.deltaTValue() + 0.1*maxDeltaTi
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),
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1.2*runTime.deltaTValue()
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)
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);
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}
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}
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if (deltaT != great)
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{
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runTime.setDeltaT(deltaT);
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Info<< "deltaT = " << runTime.deltaTValue() << endl;
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}
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}
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}
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// ************************************************************************* //
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