Why does dtmax affect stability limits with fixed epsi?
I use a fixed epsi and sometimes F3D applies a very small time step due to stability limits. I have found that a decrease of dtmax leads to increase of stability limits and time step. It sounds good because residuals are still kept below epsi and F3D runs faster. But this is like a magic.
Please could somebody give a hint why this happens?
Did my email to you with response to this question last week make sense?
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