Dear all, I'm considering a multigrid method for the Stokes problem. I need to have an approximation of Schur complement at each level that is represented by a matrix-free operator.
The problem is that in case of adaptive mesh refinement MGConstrainedDoFs assumes zero boundary condition at refinement edges. In my case that behaviour is unwanted. I have looked through the implementation of MGConstrainedDoFs and it looks like it will require changing initialize() function by adding 1 additional parameter: MGConstrainedDoFs::initialize ( const DoFHandler< dim, spacedim > & dof, const MGLevelObject< IndexSet > & level_relevant_dofs = MGLevelObject<IndexSet>() const bool& set_zero_constrain_at_refinement_edge=true) And adding if in line 331: if(set_zero_constrain_at_refinement_edge) MGTools::extract_inner_interface_dofs(dof, refinement_edge_indices); The other option to implement my MG preconditioner is to rewrite MGConstrainedDoFs together with all MG classes that rely on it. Best, Michał -- 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. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/8c43a6e1-875e-4150-b15d-14b56ab438dan%40googlegroups.com.
