On Fri, Feb 3, 2012 at 16:03, Thomas Witkowski < thomas.witkowski at tu-dresden.de> wrote:
> The system writes > > L 0 M > M L 0 > L M L > > With L = discrete laplace, M = mass matrix, 0 = empty matrix > Hmm, what are the relative scales of these equations? > > >> AMG is more delicate and generally less robust for systems. >> > Is this different with geometric multigrid? > Null space issues are usually easier with geometric, but constructing low energy interpolants can require custom work. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120203/e73c350a/attachment.htm>
