You can control the factors with -ts_adapt_clip <low>,<high>- to set admissible time step decrease and increase factors
The default setting uses low=0.1, high=10. https://petsc.org/release/docs/manualpages/TS/TSAdaptSetClip.html#TSAdaptSetClip Hong (Mr.) On Mar 5, 2022, at 12:26 PM, Tang, Qi <[email protected]> wrote: Hi, Is there a simple way to control the first few adaptive time step? Currently, I am using the following options but dt grows too fast initially. The first few time steps increase dt by a factor of 10 in each time step. Is there a way to do a slow start, say, a factor of 2 instead of 10? Thanks. -ts_type arkimex -ts_arkimex_type 2e -ts_arkimex_fully_implicit -ts_adapt_dt_min 1.0e-5 -ts_adapt_dt_max 1.0e-2 -ts_adapt_type basic Qi T-5@LANL
