Short update: Changing the threshold from 1e-6 to 1e-8 did not change anything, it still loops at the same values as final values.
Am Freitag, 6. Oktober 2017 11:56:59 UTC+2 schrieb Maxi Miller: > > Concerning the first point: > Currently I am controlling the solver as in > SolverControl solver_control (dof_handler.n_dofs(), > (system_rhs.l2_norm() > 0) ? 1e-6 * > system_rhs.l2_norm() : 1e-6); > Is your suggestion to decrease that threshold? > Concerning the second point: > Yes, my residual is decreasing, until it stops at a certain point, > together with the l2-norm. It never increases (and it never should). I am > still using a fixed step size, but will change that later. > > > Am Freitag, 6. Oktober 2017 11:52:06 UTC+2 schrieb Daniel Arndt: >> >> Maxi, >> >> two more ideas: >> - Is the residual from the linear solve sufficiently small? Does >> decreasing the tolerance help? >> - Provided the Newton matrix is invertible you are running in the >> direction of steepest decent. >> In particular, you should see your residual decreasing if the step size >> you are taking is sufficiently small >> as explained in >> https://www.dealii.org/8.5.0/doxygen/deal.II/step_15.html#Steplengthcontrol. >> Are you already following this idea? >> >> Best, >> Daniel >> > -- 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 dealii+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
