On 2/1/19 7:19 AM, [email protected] wrote: > I tried some things, but also if I insert a safety factor of 0.1 or less > the GMRES-procedure in the diffusion-step diverges. > I implemented the time step function such that > > dt <= max_{T} h_T/(u_max(T)) > > where the max is taken over all cells and u_max is the maximal value of > u on the cell T.
Then I don't have any other suggestion. Try working on a regular mesh, use a direct solver, all of the kinds of things to make the problem simpler in some sense and take away places where stuff could go wrong. If, for example, a direct solver also leads to divergence, then you know that it's not GMRES but that the problem lies somewhere earlier. Best W. -- ------------------------------------------------------------------------ Wolfgang Bangerth email: [email protected] www: http://www.math.colostate.edu/~bangerth/ -- 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.
