Question about transitional flow

Anna Tian · June 27, 2013, 17:35

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

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

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

June 27, 2013, 17:35	Question about transitional flow	#1
Anna Tian Senior Member Meimei Wang Join Date: Jul 2012 Posts: 494 Rep Power: 15	Hi Is the transitional boundary layer thicker than the turbulent boundary layer? Could transitional flow cause instability like strong vortex? __________________ Best regards, Meimei

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Simple question about pipe flow	husker	Main CFD Forum	1	February 29, 2012 03:40
Yes-No question about poiseuille flow	amin144	OpenFOAM	8	January 10, 2012 06:10
VERY SIMPLE question from people works on unsteady flow	amin144	Main CFD Forum	9	December 9, 2011 04:18
Question about Couette Flow	Tiger	Main CFD Forum	1	March 23, 2006 23:16
transitional cavity flow	elif	FLUENT	0	August 12, 2002 04:50

June 28, 2013, 04:15		#2
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	No. But if there is separation, it can be .

June 28, 2013, 05:04		#4
venkateshaero Member venki Join Date: May 2011 Posts: 84 Rep Power: 14	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
venkateshaero Member venki Join Date: May 2011 Posts: 84 Rep Power: 14	Refer Boundary layer theory by schlichting

June 28, 2013, 05:29		#7
venkateshaero Member venki Join Date: May 2011 Posts: 84 Rep Power: 14	both are different dont confuse wall separation and flow separation

June 28, 2013, 05:31		#8
venkateshaero Member venki Join Date: May 2011 Posts: 84 Rep Power: 14	Use LES model to capture exact flow separation