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[Q] CHEMISTRY POST PROCESSING takes a long time...

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Old   August 5, 2014, 20:24
Default [Q] CHEMISTRY POST PROCESSING takes a long time...
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Jinwhan Ryuk
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Does anyone have an experience that chemistry post processing takes a long time? I am solving coal combustion problem and pre processing solver takes one day but more than two days has taken for solver solves NOx calculation. How can I reduce the chemistry post processing time? I set 8 rays in radiation, upwind for advection scheme and 12 cores(hyper threading) parallel calculation for 1.2million nodes.
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Old   August 6, 2014, 08:21
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Glenn Horrocks
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I presume you mean the solver time is long - the pre- and post processing should be quick regardless of whether chemistry is present.

Yes, chemistry can make the equations less numerically stable and that leads to longer run times. "CFD" and "I need a more powerful computer" are often said together.
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Old   August 6, 2014, 09:22
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Not sure what is the source of your problem; however, you should not run ANSYS CFX with hyperthreading on. Performance will suffer once you start running in parallel.
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Old   August 8, 2014, 09:39
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Thank you very much indeed ghorrocks and Opaque.
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