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Search took 0.00 seconds. Search: Posts Made By: Docfreezzzz
Forum: Main CFD Forum January 19, 2012, 17:46
Replies: 33
Views: 2,671
Posted By Docfreezzzz
It's my experience that you can get time on the...

It's my experience that you can get time on the big machines for running cases that literally won't fit in memory. So in that regard, weak scaling is all you really need. The case keeps getting...
Forum: Main CFD Forum January 19, 2012, 17:24
Replies: 33
Views: 2,671
Posted By Docfreezzzz
Hmm... That looks a bit fishy to me. That is...

Hmm... That looks a bit fishy to me. That is also FE code and not a FV code. The coupling is a bit different so maybe there is something there. I also wonder what machine they are running on. It...
Forum: Main CFD Forum January 19, 2012, 17:12
Replies: 33
Views: 2,671
Posted By Docfreezzzz
Nope.. Remember. Proving strong scaling for us...

Nope.. Remember. Proving strong scaling for us is very hard... Memory bound ;) I can show strong scaling out to several 10s cores but past that I'm either in the cache or I can't show any kind of...
Forum: Main CFD Forum January 19, 2012, 16:29
Replies: 33
Views: 2,671
Posted By Docfreezzzz
To cfdnewbie: I'd actually be surprised if you...

To cfdnewbie: I'd actually be surprised if you couldn't get the scaling past 90% with an explicit code. I would hate to imply that the code is trivial (it's not) but the problem of parallelizing an...
Forum: Main CFD Forum January 19, 2012, 15:52
Replies: 33
Views: 2,671
Posted By Docfreezzzz
By robust I am meaning at reasonable time steps. ...

By robust I am meaning at reasonable time steps. For instance, modeling turbomachinery or combustion chambers we are interested in the temperature loading of the walls or the aero-elastic effects on...
Forum: Main CFD Forum January 19, 2012, 15:37
Replies: 33
Views: 2,671
Posted By Docfreezzzz
It is implicit unstructured with multi-polyhedral...

It is implicit unstructured with multi-polyhedral element type capability. I do store the entire left hand side matrix structure using a CRS approach. It is expensive but the only way to do it if...
Forum: Main CFD Forum January 19, 2012, 15:19
Replies: 33
Views: 2,671
Posted By Docfreezzzz
A bit of a note here. Implicit methods are...

A bit of a note here. Implicit methods are generally what "big" CFD codes as well as research codes utilize. The time step is limited only by the physics you wish to capture with implicit methods...
Forum: Main CFD Forum January 18, 2012, 13:15
Replies: 33
Views: 2,671
Posted By Docfreezzzz
Yes. You are correct that the Navier-Stokes...

Yes. You are correct that the Navier-Stokes equations aren't purely hyperbolic but my statement above still stands. The problem can be and is still handled in a localized way. Especially when...
Forum: Main CFD Forum January 18, 2012, 11:37
Replies: 33
Views: 2,671
Posted By Docfreezzzz
Generally speaking the domain is decomposed but a...

Generally speaking the domain is decomposed but a small overlap is kept on both processors on each interface. A timestep is taken and the updates are synced via MPI, etc. and the solution continues....
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