CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

Outlet BC:Fully developed flow

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   October 21, 2010, 08:34
Default Outlet BC:Fully developed flow
New Member
Vitor Braga
Join Date: Oct 2009
Posts: 28
Rep Power: 10
vitor is on a distinguished road

I have a question about the BC's for the outlet of a straight pipe. Everywhere the OF tutorials (most of them), zeroGradient is used for both temperature and velocity at the outllet. By that, the code is assuming the flow is fully developed, right? So, what if I want to simulate a short pipe? Which BC's should I use for the outlet?

I'm asking that beacuse I was comparing the results from OF and CFX (using a short pipe), and they were very different. Then I reduced the diameter and the results are now very similar. I don't know which conditions CFX uses for the outlet, but I think that was the problem with my simulation.
vitor is offline   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
pressure outlet (open channel flow) Willem Brantegem Main CFD Forum 0 April 3, 2007 09:39
How Other Conditions Impact Mass Flow Rate Outlet andy P. Main CFD Forum 2 February 9, 2007 11:41
VOF Outlet boundary condition in cfd - ace JM Main CFD Forum 0 December 15, 2006 09:07
outlet boudary condition for a flow in the pipe Atit CFX 2 November 9, 2004 18:43
Define outlet with varying flow reistance in CFX Coriolius CFX 1 October 29, 2004 17:31

All times are GMT -4. The time now is 20:28.