I tested all five preconditioners given in the namespace from LinearAlgebraTrilinos::MPI, and while some failed already at the beginning of the simulation, SSOR and AMG failed some steps into the simulation. Are there other possibilities I can check?
Am Freitag, 27. April 2018 14:27:46 UTC+2 schrieb Bruno Turcksin: > > Hi, > > On Friday, April 27, 2018 at 1:36:26 AM UTC-4, Maxi Miller wrote: > >> What can I do to find and fix the problem for that error? Or should I try >> to switch to a direct solver (like UMFPACK)? >> > You need to find a preconditioner that works better for your problem. You > can use a direct solver but since GMRES breaks because the system is > ill-conditioned, the round-off error will be large. So even if the direct > solver gives you a result, it might be wrong due to round-off error. > > Best, > > Bruno > -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
