Hong Zhang <hongzh...@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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