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Single Phase Swirling Flow Modelling with Structured and Unstructured Fluent

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Old   December 27, 1999, 00:34
Default Single Phase Swirling Flow Modelling with Structured and Unstructured Fluent
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Daniel J. Suasnabar
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Has someone carried out compartive studies with the structured and unstructured version of Fluent for single phase cyclones, hydrocyclones, or in general swirling flows?. I have done some using the same models and getting grid-independent solution for every version and found big differences. Does anybody know the reason?
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Old   December 30, 1999, 17:26
Default Re: Single Phase Swirling Flow Modelling with Structured and Unstructured Fluent
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Per Abrahamsen
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Be aware that standard k-eps models are not very good at swirling flows . Perhaps the wall functions (if you used them) are defined slightly different in the two versions.

Haven't done the kind of study you are mentioning, though..
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Old   January 18, 2000, 03:53
Default Re: Single Phase Swirling Flow Modelling with Structured and Unstructured Fluent
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Paal Chr.
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We have done some of the same kind of tests and have the same problems. The unstructured code often give somewhat unphysical results, whereas the structured one seems much more reasonable.

We have tested this for k-epsilon, RNG and Reynold stress models, and the same problems occur.

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