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-   -   How make F3D to reduce a time step many times down to dtmin? (http://www.cfd-online.com/Forums/flow-3d/71131-how-make-f3d-reduce-time-step-many-times-down-dtmin.html)

gennady December 16, 2009 10:37

How make F3D to reduce a time step many times down to dtmin?
 
When a number of iterations reaches the maximum limit, F3D reduces time step or declare nonconvergence. I use very small value for the minimum time step limit, however, F3D never reduced time step down to this limit. Moreover, a number of time step reductions can be just one before nonconvergence despite that the time step is still much larger than the limit.
What controls a number of time step reductions? How to make F3D to reduce a time step many times until its value reaches the minimum limit?
Thank you.

ignatz January 28, 2010 13:12

Gennady, Have you tried contacting Flow Science, F3D's developer?


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