[petsc-users] TS and snes_grid_sequence

[Jed Brown]

Hong Zhang <hongzhang at anl.gov> writes:

> There is one particular integration method that may make the life easier — backward Euler. It has only one stage at each time step.
>
> To Francesco: which TS method are you using? Is it backward Euler or
> the default theta method? 

Default is forward Euler, which should almost never be used.

Stages per step shouldn't be a serious concern.  But -snes_grid_sequence
will never work for TS (it's a weird option that refines the SNES during
the solve -- it doesn't make semantic sense for TS).
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