Forgot to say, an FGMRES iterative solver On Monday, August 10, 2020 at 12:10:59 AM UTC-4, Feimi Yu wrote: > > I'm solving for a SUPG stabilized slightly compressible Navier-Stokes > equation, with a Schur complement type preconditioner. > > Feimi > > On Sun, Aug 9, 2020 at 11:16 PM Wolfgang Bangerth <[email protected] > <javascript:>> wrote: > >> On 8/9/20 7:22 PM, Feimi Yu wrote: >> > >> > I realized something after I posted my question, so I removed it after >> a >> > while. Sorry that my original post is not shown in the thread. After >> checking >> > the output block IDs in ParaView I found that it was not >> > the unbalanced load that caused the slow computation, but somehow the >> hanging >> > nodes themselves, which caused the change of condition number in the >> system >> > matrix. >> >> No, that too isn't your problem. Hanging nodes don't make the condition >> number >> significantly worse. What's the equation you're solving, and what's your >> solver and preconditioner? >> >> Best >> W. >> -- >> ------------------------------------------------------------------------ >> Wolfgang Bangerth email: [email protected] >> <javascript:> >> www: http://www.math.colostate.edu/~bangerth/ >> >> -- >> 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 [email protected] <javascript:>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/dealii/8b2fa2ba-08a9-d5f2-fa65-54166a35ab9e%40colostate.edu >> . >> >
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