pipe with sudden expansion results

Denied · June 5, 2016, 18:34

Please someone explain to me what differences should i be able to see between using a uniform velocity profile at the inlet and a parabolic one for what concerns recirculation after the expansion step and attachment/reattachment of the flow.

Far · June 6, 2016, 14:15

Only difference is that, with parabolic profile you can reduce the pipe length. For uniform velocity, you will have to provide more (before step) length to allow the flow to be fully devolved (parabolic profile)

Denied · June 6, 2016, 16:45

But I am assuming the flow at the inlet already fully developed and turbulent

Far · June 7, 2016, 10:08

Quote:

Originally Posted by Denied

But I am assuming the flow at the inlet already fully developed and turbulent

yes it can be. But how you can ensure this one in CFD simulation. Answer is use parabolic profile at inlet in that case.

June 5, 2016, 18:34	pipe with sudden expansion results	#1
Denied New Member Join Date: Jun 2016 Posts: 4 Rep Power: 9	Please someone explain to me what differences should i be able to see between using a uniform velocity profile at the inlet and a parabolic one for what concerns recirculation after the expansion step and attachment/reattachment of the flow.

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June 6, 2016, 14:15		#2
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	Only difference is that, with parabolic profile you can reduce the pipe length. For uniform velocity, you will have to provide more (before step) length to allow the flow to be fully devolved (parabolic profile)

June 6, 2016, 16:45		#3
Denied New Member Join Date: Jun 2016 Posts: 4 Rep Power: 9	But I am assuming the flow at the inlet already fully developed and turbulent