Parallel run Slows with Field average -- CFD Online Discussion Forums

October 13, 2012, 00:22	Parallel run Slows with Field average	#1
owayz Senior Member Awais Ali Join Date: Feb 2010 Location: Germany Posts: 128 Rep Power: 17	Hallo All, I just discovered something strange. I am doing something wrong but I am not able to figure it out. I will first define my problem. I have a mesh of 3M cells, which I am running on 216 processors in parallel. The decomposition is hierarchical (6 6 6). I don't have any issues with the simulation until I start fieldAveraging over time, the simulation suddenly slows down a lot. To give you an idea if 4 corrector steps without averaging were taking 2.4 s approx, and with averaging the time goes to 33-37 s approx. And this has been bugging me because if I kept going on this pace, I will finish the simulation in 6 months. Please help. Regards, Awais

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