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-   -   Question about transitional flow (http://www.cfd-online.com/Forums/main/119982-question-about-transitional-flow.html)

Anna Tian June 27, 2013 17:35

Question about transitional flow
 
Hi

Is the transitional boundary layer thicker than the turbulent boundary layer? Could transitional flow cause instability like strong vortex?

Far June 28, 2013 04:15

No. But if there is separation, it can be .

Anna Tian June 28, 2013 04:58

Quote:

Originally Posted by Far (Post 436490)
No. But if there is separation, it can be .

How do you define BL separation? If the BL is separated from the wall due to the discontinuity of the wall geometry, would you also call it 'BL separation'?

venkateshaero June 28, 2013 05:04

If the BL is separated from the wall due to the discontinuity of the wall geometry, I think this statement is wrong, Flow Separation depends on fluid property, Geomety, surface roughness

venkateshaero June 28, 2013 05:06

Refer Boundary layer theory by schlichting

Anna Tian June 28, 2013 05:21

Quote:

Originally Posted by venkateshaero (Post 436505)
If the BL is separated from the wall due to the discontinuity of the wall geometry, I think this statement is wrong, Flow Separation depends on fluid property, Geomety, surface roughness

I meant: like there is a 90 degree corner, then due to this discontinuity of the geometry, the BL fly away. Could we also call this as BL separation?

venkateshaero June 28, 2013 05:29

both are different dont confuse wall separation and flow separation

venkateshaero June 28, 2013 05:31

Use LES model to capture exact flow separation


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