Radial velocity with a swirling core in laminar pipe flow

MissCFD · June 25, 2015, 22:55

Hello,

Can everybody explain me where that the radial velocity come from in straight pipe flow with a swirling wall in the core of the pipe ? I suppose that it is in relation to boundaries layers ?!

Although the radial velocity is negligible compared with the others components, I noted that the radial velocity reach a max peak near the rotating wall and an other near the static wall and I just wondered why ?

Thank you

ghorrocks · June 26, 2015, 08:03

Yes, this sounds like a secondary flow. Look up "secondary flow" on google and you should get some good examples of flows you would not expect.

June 25, 2015, 22:55	Radial velocity with a swirling core in laminar pipe flow	#1
MissCFD Senior Member Join Date: Aug 2014 Posts: 160 Rep Power: 12	Hello, Can everybody explain me where that the radial velocity come from in straight pipe flow with a swirling wall in the core of the pipe ? I suppose that it is in relation to boundaries layers ?! Although the radial velocity is negligible compared with the others components, I noted that the radial velocity reach a max peak near the rotating wall and an other near the static wall and I just wondered why ? Thank you

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June 26, 2015, 08:03		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	Yes, this sounds like a secondary flow. Look up "secondary flow" on google and you should get some good examples of flows you would not expect.