"Mark W. Lohry" <mlo...@princeton.edu> writes: > I have an unsteady problem I'm trying to solve for steady state. The regular > time-accurate stepping works fine (uses around 5 Newton iterations with 100 > krylov iterations each per time step) with beuler stepping. > > > But when changing only TSType to pseudo it looks like SNES max iterations is > getting set to 1, and each pseduo time step then only does a single Newton > step and then throws SNES CONVERGED_ITS 1 despite setting snessettolerances > to allow 50 Newton steps.
Pseudotransient continuation (as described in the cited papers and implemented in TSPseudo) does only one Newton step. In practice, converging the Newton solver on each pseudo-time step usually costs more. You can change -snes_type (TSPseudo defaults it to KSPONLY). See -ts_view for details. > I'm trying to use all the same configuration here that works for backward > Euler, but just continually increase the step size each time step. What am I > missing here? > > Thanks, > Mark
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