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-   -   Single Phase Swirling Flow Modelling with Structured and Unstructured Fluent (http://www.cfd-online.com/Forums/fluent/27429-single-phase-swirling-flow-modelling-structured-unstructured-fluent.html)

Daniel J. Suasnabar December 27, 1999 00:34

Single Phase Swirling Flow Modelling with Structured and Unstructured Fluent
 
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?

Per Abrahamsen December 30, 1999 17:26

Re: Single Phase Swirling Flow Modelling with Structured and Unstructured Fluent
 
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..

Paal Chr. January 18, 2000 03:53

Re: Single Phase Swirling Flow Modelling with Structured and Unstructured Fluent
 
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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