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Showing results 1 to 6 of 6 Search took 0.00 seconds. Search: Posts Made By: hjasak

Forum: OpenFOAM Running, Solving & CFD January 18, 2007, 14:21

Replies: 13 AMG Solver in parallel Views: 5,380 Posted By hjasak Yeah, it does look pretty cool Yeah, it does look pretty cool, doesn't it? :-) I haven't been expecting such a great improvement in performance but it looks like surprises do indeed exist. The work will be presented on 15th...

Forum: OpenFOAM Running, Solving & CFD December 13, 2006, 08:46

Replies: 13 AMG Solver in parallel Views: 5,380 Posted By hjasak Heya, 1) You should be spen Heya, 1) You should be spending 50-80% of total execution time in the solvers. When you do a profile, the linear solvers should be first by a long way, followed by the velocity gradient and...

Forum: OpenFOAM Running, Solving & CFD December 6, 2006, 05:37

Replies: 13 AMG Solver in parallel Views: 5,380 Posted By hjasak This is good news. Incidental This is good news. Incidentally, round-off error pollution will be a problem in your case with single precision. What should be done is to keep x and residual in double precision; the rest of the...

Forum: OpenFOAM Running, Solving & CFD December 5, 2006, 08:13

Replies: 13 AMG Solver in parallel Views: 5,380 Posted By hjasak I am just writing a paper of v I am just writing a paper of very fast solvers, containing some considerable new work. :-) Incidentally, do you have a particularly bad communications on your parallel machine? BTW, I would...

Forum: OpenFOAM Running, Solving & CFD December 5, 2006, 05:49

Replies: 13 AMG Solver in parallel Views: 5,380 Posted By hjasak Sorry, a few more questions: Sorry, a few more questions: - can you plot the residual history for the solver (go to ~/.OpenFOAM-1.3/controlDict and set the debug switch for lduMatrix to 2. This will give you a residual for...

Forum: OpenFOAM Running, Solving & CFD December 5, 2006, 05:29

Replies: 13 AMG Solver in parallel Views: 5,380 Posted By hjasak It probably means you've messe It probably means you've messed up your discretisation or boundary conditions. The solver is "slow" because it is doing a maximum number of iterations without converging, meaning that something in...

Showing results 1 to 6 of 6

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