Dear all, I was trying to solve the Eddy Current Problem with Multigrid. I have curl-conforming boundary constraints, i.e. n x u = 0.
I managed to apply these to the system matrix via VectorTools::project_boundary_values_curl_conforming_l2() Unlike step-16 where the same approach has been demonstrated for the LaplaceProblem, I didn't find any method, which allows me to apply the before mentioned boundary constraints to the MGConstrainedDoFs object. Thus I computed the curl conforming constraints in assemble_multigrid, when I instantiated the boundary_constraints on each level. The matrix on the finest grid is the same as the system matrix, which means that my workaround should have worked. How can I apply my boundary constraints to the transfer matrices between the level meshes, if they are not contained in MGConstrainedDoFs? Currently I am still using: MGTransferPrebuilt<VectorType> mg_transfer(mg_constrained_dofs); mg_transfer.build_matrices(dof_handler); Obviously this isn't correct though, since the boundary constraints haven't been accounted for. How can I add curl conforming boundary constraints to the transfer matrices? Is there any other way that I can deal with the curl conforming boundary conditions, when I am working with Multigrid? Kind regards, Julian P.S. Note that my Multigrid approach is not MatrixFree. Thus I don't think that I can use MGConstrainedDoFs.add_user_constraints() since this only applies to MatrixFree methods. -- 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/c73b6bf3-8091-4a4d-8166-0e5c4cdc42bb%40googlegroups.com.
