Hi I am solving an elasticity problem with the following iterative solver options:
-ksp_monitor_true_residual -ksp_converged_reason -ksp_type cg -log_view -mg_levels_esteig_ksp_type cg -mg_levels_ksp_chebyshev_esteig_steps 50 -mg_levels_ksp_type chebyshev -mg_levels_pc_type jacobi -pc_type gamg -snes_linesearch_type basic -snes_atol 1e-6 -ksp_atol 1e-7 -ksp_rtol 1e-9 -ksp_norm_type unpreconditioned I am passing the rigid body bodes to the KSP solver. There is a noticeable increase in the number of iterations when the size ratio between biggest and smallest element increases. This problem is also solving for two materials with a high contrast in their properties, so this could have an effect, but the iterations don’t increase as much when the mesh is uniform. I wonder if there is some information about the mesh that could be passed to the preconditioner to improve its performance. Thanks Miguel ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Libmesh-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-users
