"Salazar De Troya, Miguel" <salazardet...@llnl.gov> writes:
> I am not 100% confident because I am not sure how libMesh handles the > Dirichlet boundary conditions, How are you using libmesh? Normally you write the boundary conditions. Many of the examples use penalty conditions, which maintain symmetric but have other problems. > I am trying to speed up a two dimensional linear elasticity problem with > isotropic and heterogeneous properties. It is a topology optimization > problem, therefore some regions have an almost zero stiffness whereas other > regions have a higher value, making the matrix ill-conditioned. So far, from > having searched mail lists on similar problems, I have come up with the > following CL options to pass to the petsc solver (two dimensional problem): > > -ksp_type cg -pc_type fieldsplit -pc_fieldsplit_block_size 2 > -fieldsplit_pc_type hypre -fieldsplit_pc_hypre_type boomeramg > -fieldsplit_pc_hypre_boomeramg_strong_threshold 0.7 -pc_fieldsplit_0 0,1 This option looks funny. What are you trying to do here? > -pc_fieldsplit_type symmetric_multiplicative -ksp_atol 1e-10
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