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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2022-2026 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
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/>.
\*---------------------------------------------------------------------------*/
#include "VoFSolver.H"
#include "fviSurfaceIntegrate.H"
// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
void Foam::solvers::VoFSolver::setRDeltaT()
{
volScalarField& rDeltaT = trDeltaT.ref();
const dictionary& pimpleDict = pimple.dict();
const scalar maxCo
(
pimpleDict.lookupOrDefault<scalar>("maxCo", 0.9)
);
const volScalarField rDeltaT0("rDeltaT0", rDeltaT);
// Set the reciprocal time-step from the local Courant number
rDeltaT.internalFieldRef() = fvi::surfaceSum(mag(phi))/((2*maxCo)*mesh.V());
// Clip to user-defined maximum and minimum time-steps
scalar minRDeltaT = gMin(rDeltaT.primitiveField());
if (pimpleDict.found("maxDeltaT") || minRDeltaT < rootVSmall)
{
const scalar clipRDeltaT = 1/pimpleDict.lookup<scalar>("maxDeltaT");
rDeltaT.primitiveFieldRef().boundLower(clipRDeltaT);
minRDeltaT = max(minRDeltaT, clipRDeltaT);
}
if (pimpleDict.found("minDeltaT"))
{
const scalar clipRDeltaT = 1/pimpleDict.lookup<scalar>("minDeltaT");
rDeltaT.primitiveFieldRef().boundUpper(clipRDeltaT);
minRDeltaT = min(minRDeltaT, clipRDeltaT);
}
Info<< "Flow time scale min/max = "
<< gMin(1/rDeltaT.primitiveField()) << ", " << 1/minRDeltaT << endl;
setInterfaceRDeltaT(rDeltaT);
// Limit rate of change of time scale
// - reduce as much as required
// - only increase at a fraction of old time scale
if
(
pimpleDict.found("rDeltaTDampingCoeff")
&& runTime.timeIndex() > runTime.startTimeIndex() + 1
)
{
// Damping coefficient (1-0)
const scalar rDeltaTDampingCoeff
(
pimpleDict.lookup<scalar>("rDeltaTDampingCoeff")
);
rDeltaT = max
(
rDeltaT,
(scalar(1) - rDeltaTDampingCoeff)*rDeltaT0
);
Info<< "Damped flow time scale min/max = "
<< gMin(1/rDeltaT.primitiveField())
<< ", " << gMax(1/rDeltaT.primitiveField()) << endl;
}
}
// ************************************************************************* //
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