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high velocity flow - problem with convergence

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Old   May 23, 2012, 09:00
Default high velocity flow - problem with convergence
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Trying to model high velocity flow (400m/s) through a pipe system in Fluent. Are there any specific models that should be turned on to aid convergence?
if not, can relaxation factors be tweaked in any way to help?
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Old   May 23, 2012, 11:26
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Trying to model high velocity flow (400m/s) through a pipe system in Fluent. Are there any specific models that should be turned on to aid convergence?
if not, can relaxation factors be tweaked in any way to help?
use density based solver with hybrid initialisation and solution steering. In solution steering choose the min CLF = 0.1 (or lower) and max = 50 and choose the flow regime (transonic or supersonic)
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Old   May 24, 2012, 04:32
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Thanks for the reply Far. I was wondering what CLF stands for in the solution steering? I can't see anything that it might refer to.

Thanks again
Kevin
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Old   May 24, 2012, 05:17
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min and max courant number

go to "more settings" and you find that option there.

https://www.sharcnet.ca/Software/Flu...ug/node840.htm

https://www.sharcnet.ca/Software/Flu...ug/node838.htm
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Old   May 24, 2012, 06:40
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Thanks Far. Much appreciated
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