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 June 27, 2013, 17:35 Question about transitional flow #1 Senior Member     Meimei Wang Join Date: Jul 2012 Posts: 494 Rep Power: 7 Hi Is the transitional boundary layer thicker than the turbulent boundary layer? Could transitional flow cause instability like strong vortex? __________________ Best regards, Meimei

 June 28, 2013, 04:15 #2 Super Moderator     Sijal Ahmed Memon (turboenginner@gmail.com) Join Date: Mar 2009 Location: Islamabad Pakistan Posts: 3,993 Blog Entries: 6 Rep Power: 39 No. But if there is separation, it can be .

June 28, 2013, 04:58
#3
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Meimei Wang
Join Date: Jul 2012
Posts: 494
Rep Power: 7
Quote:
 Originally Posted by Far 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'?
__________________
Best regards,
Meimei

 June 28, 2013, 05:04 #4 Member   venki Join Date: May 2011 Posts: 84 Rep Power: 6 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

 June 28, 2013, 05:06 #5 Member   venki Join Date: May 2011 Posts: 84 Rep Power: 6 Refer Boundary layer theory by schlichting

June 28, 2013, 05:21
#6
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Meimei Wang
Join Date: Jul 2012
Posts: 494
Rep Power: 7
Quote:
 Originally Posted by venkateshaero 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?
__________________
Best regards,
Meimei

 June 28, 2013, 05:29 #7 Member   venki Join Date: May 2011 Posts: 84 Rep Power: 6 both are different dont confuse wall separation and flow separation

 June 28, 2013, 05:31 #8 Member   venki Join Date: May 2011 Posts: 84 Rep Power: 6 Use LES model to capture exact flow separation

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