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Forum: OpenFOAM Running, Solving & CFD

September 30, 2011, 02:32

Replies: 69

Large case parallel efficiency

Views: 22,702

Posted By flavio_galeazzo

Thanks for the explanation, arjun. It makes more...

Thanks for the explanation, arjun. It makes more sense to me now.

I think I was too vague in my last post. Sorry lakeat. When I said that it worked well, I wanted to say that when solving an...

Forum: OpenFOAM Running, Solving & CFD

September 9, 2011, 09:47

Replies: 69

Large case parallel efficiency

Views: 22,702

Posted By flavio_galeazzo

Hi lakeat, Your experiences seems to be...

Hi lakeat,

Your experiences seems to be similar. Unfortunately I have no clue on how to improve the scalability of my incompressible solver. One workaround is to use a compressible solver for an...

Forum: OpenFOAM Running, Solving & CFD

September 9, 2011, 04:13

Replies: 69

Large case parallel efficiency

Views: 22,702

Posted By flavio_galeazzo

I would like to share my newest experience with...

I would like to share my newest experience with the scalability of the linear solvers in OpenFoam. I used to run simulations using compressible solvers, and used the PCG linear solver for pressure...

Forum: OpenFOAM Running, Solving & CFD

May 18, 2011, 13:27

Replies: 69

Large case parallel efficiency

Views: 22,702

Posted By flavio_galeazzo

Hi jdiorio, If you cannot guarantee that the...

Hi jdiorio,

If you cannot guarantee that the nodes work only for you, there is no surprise that your computation time varies greatly. One time the machine is working for your job only, and another...

Forum: OpenFOAM Running, Solving & CFD

April 8, 2011, 03:14

Replies: 69

Large case parallel efficiency

Views: 22,702

Posted By flavio_galeazzo

I like to use the "1 second rule" for my...

I like to use the "1 second rule" for my simulations, but I can't follow it every time due to the avaiable ressorces. But all my simulations have scale well up to now, even with time averaging turned...

Forum: OpenFOAM Running, Solving & CFD

March 9, 2011, 03:35

Replies: 69

Large case parallel efficiency

Views: 22,702

Posted By flavio_galeazzo

I have the same experience as you about...

I have the same experience as you about Infiniband, Daniel. It is crucial to get good speed up with more than 4-5 machines.

I normally allocate the nodes for simulation aiming for 1 second per...

Forum: OpenFOAM Running, Solving & CFD

October 21, 2010, 05:01

Replies: 69

Large case parallel efficiency

Views: 22,702

Posted By flavio_galeazzo

My experience with large cases is very close to...

My experience with large cases is very close to Simon one. I have run LES cases up to 10 million nodes on up to 256 cores, with parallel eficiency around 85%, always using Metis as decomposition...

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