OK. So do I understand you correctly, that you are imposing Neumann boundary conditions on all *four* boundaries? In that case the solution is only unique up to a constant.
It seems to my that in the problem I posed, the boundary condition is not > correct. > Can you be a bit more specific? How does the weak formulation you consider look like? What kind of problems do you observe? 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.
