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Old   June 4, 2014, 15:06
Question Parallelize discrete phase model UDF
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Hi there

I'm doing a spray simulation using ANSYS Fluent 12.1.4 on Windows 7 and a UDF to handle some material properties and droplet evaporation. The code works as it should and simulations converge good.

The simulation runs on a multi core pc but the DPM iterations use only one core. This slows down the whole process tremendously and I wonder if it was possible to use all (8) cores for the DPM/UDF iteration aswell.

I read some threads:
Fluent UDF on parallel computing
parallel fluent on pc with udf

and also the according User Guide chapters:
http://aerojet.engr.ucdavis.edu/flue....htm#DPMDEFINE
http://aerojet.engr.ucdavis.edu/flue...df/node204.htm
http://aerojet.engr.ucdavis.edu/flue...df/node207.htm
http://www.arc.vt.edu/ansys_help/flu...elize_dpm.html

Unfortunately, I wasn't able to figure out whether the UDF or the DPM itself allows only one core at a time.

Thanks for your help!
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Old   June 6, 2014, 12:59
Default Update: UDF not the problem
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Hi there

It turns out the UDF has no influence on my problem. Even when removing the code, DPM iterations only run on a single core.

I don't understand how to properly set up parallel DPM options. First I used "message passing", with the above stated result. When changing to "shared memory", I wanted to select 4 threads for the workpile algorithm but after running an iteration, fluent automatically resets this value to 1 (I'm running fluent parallel on 4 cores!).

Has anyone had similar issues?

Thanks again,
volume808

Last edited by volume808; June 6, 2014 at 14:12.
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