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-   -   Can I catch the secondary flow using ke model? (http://www.cfd-online.com/Forums/fluent/32277-can-i-catch-secondary-flow-using-ke-model.html)

richard October 7, 2003 03:54

Can I catch the secondary flow using ke model?
 

richard October 7, 2003 04:13

Re: Can I catch the secondary flow using ke model?
 
rngke or rsm is better than ke model, but can ke catch the secondary flow?

richard November 3, 2003 12:40

Re: Can I catch the secondary flow using ke model?
 
Why no one answer my question?

Volker Pawlik November 26, 2003 03:59

Re: Can I catch the secondary flow using ke model?
 
Yes, but only pressure induced.

For shear-stress induced secondary flows (e.g. swirls in the corners of a rectangle croos-sectiuon) you have to use RSM.

Volker

richard November 26, 2003 09:40

Re: Can I catch the secondary flow using ke model?
 
thanks, but can you tell me more about the difference between second flows induced by pressure and shear-stress?and some references is welcome.thanks again.

Volker Pawlik November 26, 2003 10:35

Re: Can I catch the secondary flow using ke model?
 
with k-eps you can model secondary flows like swirls happen to exist behind backward facing step (cross-section increase). Such eddy water situations are caused by pressure differences.

The secondary flows which cannot be covered by k-eps, are those which happen to appear in non-circular ducts. Two eddies in every corner can be obeserved.

Literature: Every good book on fluid mechanics (or dynamics). (e.g. Bird, Stewar Lightfoot, Transportphenomena, there I found the citation of Schlichtigs "Grenzschichttheorie" or Boundary-Layer Theory with eddies in a triangular duct)


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