CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Outlet vent vs Outflow

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

Like Tree4Likes
  • 4 Post By Jason

LinkBack Thread Tools Display Modes
Old   July 19, 2005, 10:37
Default Outlet vent vs Outflow
Posts: n/a

Does anybody can explain to me what is the difference between outlet vent and outflow?


  Reply With Quote

Old   July 19, 2005, 14:16
Default Re: Outlet vent vs Outflow
Posts: n/a
Outflow is a very limited BC. It assumes fully developed flow, can't be used with Pressure Inlets, or compressible flow. It is useful in pipeflows for example, when you don't know the conditions of the flow, but you're BC is far enough downstream where the fully developed assumption holds true.

The outlet vent is like a pressure outlet (so it's a pretty versatile BC) combined with a loss coefficient. Here, you define what the pressure is "outside" of your vent, and the loss coefficient (which is a function of velocity) through the vent, and the backflow conditions. An example would be on an electronics box (like a computer). A fan would pull cool air into the box, and it would exit through a vent. The vent is going to induce some losses on the system (if you invent a vent that doesn't, then patent it and we'll split the profits...) and this BC is used to account for that.

Hope this helps, and good luck, Jason
  Reply With Quote

Old   July 20, 2005, 12:59
Default Re: Outlet vent vs Outflow
Posts: n/a
Thanks man! really helpful your answer. AJG
  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
not outflow at outlet in interFoam deniggo OpenFOAM 14 May 23, 2012 06:22
Outlet Vent Loss Coefficient jpo FLUENT 0 June 24, 2009 19:15
B.C.S on outflow outlet and pressure outlet kenneth Main CFD Forum 4 May 29, 2008 20:57
HELP !!difference of outflow and pressure outlet?? Kwong FLUENT 1 April 11, 2007 05:04
VOF Outlet boundary condition in cfd - ace JM Main CFD Forum 0 December 15, 2006 09:07

All times are GMT -4. The time now is 11:17.