<div class="gmail_quote">On Wed, Jun 22, 2011 at 16:58, Qian Zhu <span dir="ltr"><<a href="mailto:qzhu@mcs.anl.gov">qzhu@mcs.anl.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
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).</blockquote>
<div><br></div><div>boundary conditions are not symmetric in this example</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> What would this "xxx" value be? Or is there any input parameters I am missing out for these applications?</blockquote>
</div><br><div>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.</div>