# What is the "best" decompostition method?

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 March 1, 2012, 07:33 What is the "best" decompostition method? #1 Senior Member     Attesz Join Date: Mar 2009 Location: Munich Posts: 364 Rep Power: 10 Sponsored Links Hi, I'm dealing with an axial fan of 3 regions, and I'm currently using the scotch decomposition method. In your opinion, what is the best decomp. method for such cases (long domain, 2 interface). I'm thinking about the structured method... __________________ https://cfd-freelancing.com

 March 1, 2012, 09:56 #2 Senior Member   Olivier Join Date: Jun 2009 Location: France, grenoble Posts: 266 Rep Power: 11 hello, just my 2 cents From some test i made some time ago, ... it depend of your geometry. - With "simple" one like pipe and / or very elongated in one or two direction, try the simple/ hierarchical method in the corresponding direction. - with no clear direction, scotch will do a very good job. regards, olivier

 March 1, 2012, 10:09 #3 Senior Member     Attesz Join Date: Mar 2009 Location: Munich Posts: 364 Rep Power: 10 Thanks Olivier. My geometry is elongated in y direction, but I'll run on 16cores or more. Decomposing the geometry as (2 4 2) could be a good start in your opinion? __________________ https://cfd-freelancing.com

 March 1, 2012, 10:32 #4 Senior Member   Olivier Join Date: Jun 2009 Location: France, grenoble Posts: 266 Rep Power: 11 No, if your geometry is on the y axis, i would try (1 16 1). But make a small bench, and you would get your answer ... regards, olivier

March 1, 2012, 10:34
#5
Senior Member

Attesz
Join Date: Mar 2009
Location: Munich
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Quote:
 But make a small bench
I've 20millions of cells and transient simulation, so doing a small benchmark is not so easy but thank you, I'll try it!

best,
Attila
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 March 1, 2012, 10:48 #6 Senior Member   Olivier Join Date: Jun 2009 Location: France, grenoble Posts: 266 Rep Power: 11 then decompose using different setting, and sum the total of exchange face: the less = the best. Attesz likes this.

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