On Jun 22, 2011, at 10:26 AM, Jed Brown wrote: > On Wed, Jun 22, 2011 at 16:58, Qian Zhu <qzhu at mcs.anl.gov> wrote: > For ex5, par=xxx, using "-ksp_type gmres -pc_type ilu" will make the > solution converge while using "-ksp_type cg -pc_type jacobi" cannot (all > ksp's and pc's are just randomly picked...they may not make sense). > > boundary conditions are not symmetric in this example > > What would this "xxx" value be? Or is there any input parameters I am missing > out for these applications? > > look at snes ex19 and use -lidvelocity 100 -grashof 1e5 if you are looking > for something that doesn't converge. Or try a Stokes problem.
Thanks for the reply, Jed. I worked on ex27 so I know setting certain values for the input parameters can make the case converge/non-converge...I am just wondering whether this is also true with ex5 and ex20 (We picked them for other interesting characteristics). Which examples are solving the Stokers problem? Thanks a lot! Qian Zhu, Ph.D. Mathematics and Computer Science Division Argonne National Laboratory 9700 S.Cass Avenue Argonne, IL 60439-4844 Phone: 630-252-0086 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20110622/22b58598/attachment.htm>
