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.
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About OpenFOAM
OpenFOAM is a free, open source computational fluid dynamics (CFD) software package released by the OpenFOAM Foundation. It has a large user base across most areas of engineering and science, from both commercial and academic organisations. OpenFOAM has an extensive range of features to solve anything from complex fluid flows involving chemical reactions, turbulence and heat transfer, to solid dynamics and electromagnetics.
Copyright
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. See the file COPYING in this directory or
http://www.gnu.org/licenses/, for a description of the GNU General Public
License terms under which you can copy the files.