68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/*---------------------------------------------------------------------------*\
|
|
========= |
|
|
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
|
|
\\ / O peration |
|
|
\\ / A nd | www.openfoam.com
|
|
\\/ M anipulation |
|
|
-------------------------------------------------------------------------------
|
|
Copyright (C) 2017 OpenCFD Ltd.
|
|
-------------------------------------------------------------------------------
|
|
License
|
|
This file is part of OpenFOAM.
|
|
|
|
OpenFOAM is free software: you can redistribute it and/or modify it
|
|
under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
|
|
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
Global
|
|
setDeltaT
|
|
|
|
Description
|
|
Reset the timestep to maintain a constant maximum courant Number.
|
|
Reduction of time-step is immediate, but increase is damped to avoid
|
|
unstable oscillations.
|
|
|
|
\*---------------------------------------------------------------------------*/
|
|
|
|
if (adjustTimeStep)
|
|
{
|
|
scalar maxDeltaTFact =
|
|
min
|
|
(
|
|
maxCo/(CoNum + SMALL),
|
|
min
|
|
(
|
|
maxAlphaCo/(alphaCoNum + SMALL),
|
|
min
|
|
(
|
|
maxAlphaDdt/(ddtAlphaNum + SMALL),
|
|
maxDi/(DiNum + SMALL)
|
|
)
|
|
)
|
|
);
|
|
|
|
scalar deltaTFact = min(min(maxDeltaTFact, 1.0 + 0.1*maxDeltaTFact), 1.2);
|
|
|
|
runTime.setDeltaT
|
|
(
|
|
min
|
|
(
|
|
deltaTFact*runTime.deltaTValue(),
|
|
maxDeltaT
|
|
)
|
|
);
|
|
Info<< "deltaT = " << runTime.deltaTValue() << endl;
|
|
}
|
|
|
|
|
|
// ************************************************************************* //
|