modeling fluid in pipe

hamid1 · June 29, 2011, 09:55

In modeling fluid flow in a pipe, when do I need to see the fully developed flow? (either of laminar or turbulent regime)
Do I need specific length in inlet or outlet?
What is the criterion for that?
I was thinking that if after any modeling there wouldn’t be any circulation (which cause back flow) in openings the length is enough (either of inlet or outlet), is it true?

hasanduz · September 8, 2011, 07:59

hi hamid

I have a problem like yours. I want to simulate laminar-turbulent transition pipe flow through LES model in FLUENT 12. I want to simulate fluctuation ( pressure and velocity ) at the antrance region and want to see the laminar and transitional region.This is my thesis study.
I dont know how can manage this one through LES model.
If you have any information about, can you help me.

thanks to you

June 29, 2011, 09:55	modeling fluid in pipe	#1
hamid1 Senior Member hamid Join Date: Nov 2010 Posts: 185 Rep Power: 15	In modeling fluid flow in a pipe, when do I need to see the fully developed flow? (either of laminar or turbulent regime) Do I need specific length in inlet or outlet? What is the criterion for that? I was thinking that if after any modeling there wouldn’t be any circulation (which cause back flow) in openings the length is enough (either of inlet or outlet), is it true?

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September 8, 2011, 07:59		#2
hasanduz New Member hasan Join Date: Aug 2011 Location: Diyarbakır / Turkey Posts: 3 Rep Power: 15	hi hamid I have a problem like yours. I want to simulate laminar-turbulent transition pipe flow through LES model in FLUENT 12. I want to simulate fluctuation ( pressure and velocity ) at the antrance region and want to see the laminar and transitional region.This is my thesis study. I dont know how can manage this one through LES model. If you have any information about, can you help me. thanks to you