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Forum: OpenFOAM Running, Solving & CFD August 22, 2011, 10:19
Replies: 69
Views: 22,702
Posted By alberto
Hi, it is quite general. In my experience...

Hi,

it is quite general. In my experience using GAMG on the pressure equation for large cases leads to very nice improvements in performance (much lower number of iterations: 1/3 is a bit on the...
Forum: OpenFOAM Running, Solving & CFD August 22, 2011, 10:05
Replies: 69
Views: 22,702
Posted By alberto
His statement is that the AMG scales worse as...

His statement is that the AMG scales worse as strategy than Krylov solvers (gradient methods, to use a probably more common term among students), but that AMG solvers require about 1/3 of the number...
Forum: OpenFOAM Running, Solving & CFD January 17, 2011, 23:28
Replies: 69
Views: 22,702
Posted By alberto
Also, take a look at the study presented at the...

Also, take a look at the study presented at the Open Source CFD Conference 2010:

G. Shainer et al., OpenFOAM optimizations for Scale

They might give some information of interest for you.
Forum: OpenFOAM Running, Solving & CFD October 21, 2010, 11:22
Replies: 69
Views: 22,702
Posted By alberto
We have the same experience you had Flavio, with...

We have the same experience you had Flavio, with out LES on micro-reactors (>= 10^6 cells) using metis/scotch (scotch is actually slightly better it seems, even if the difference with respect to...
Forum: OpenFOAM Running, Solving & CFD October 18, 2010, 14:49
Replies: 69
Views: 22,702
Posted By alberto
Yes, same experience here with our LES on...

Yes, same experience here with our LES on micro-reactors.



Out of curiosity, what is your experience with scotch? We had interesting results with it too, but it would be helpful to know other...
Forum: OpenFOAM Running, Solving & CFD October 15, 2010, 00:06
Replies: 69
Views: 22,702
Posted By alberto
It depends on a lot of factors, so at least you...

It depends on a lot of factors, so at least you should say what method did you use to decompose your case, what architecture (multicore? how do CPU/nodes are distributed, meaning how many cores per...
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