CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > General Forums > Main CFD Forum

Pressure Outlet B.C.

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 2, 2001, 04:35
Default Pressure Outlet B.C.
  #1
Max Nutini
Guest
 
Posts: n/a
Hi I'm using commercial codes (CFX and Fluent). In both cases there is the possibility of setting "Pressure outlet" B.C. It is not clear to me what are in this case the B.C. set to the other variables (i.e. Temperature) at domain exit. Is there a general rule for the B.C. to be set at Pressure Outlets for the other variables (Temperature, velocities, species) or is it "code-dependent" ?

Thanks

Max
  Reply With Quote

Old   March 2, 2001, 19:00
Default Re: Pressure Outlet B.C.
  #2
John C. Chien
Guest
 
Posts: n/a
(1)."code-dependent?", you should be able to get your own conclusion easily, by solving the same problem using both codes and the same outlet conditions. (2). I have no idea what's in the code.
  Reply With Quote

Old   March 8, 2001, 21:55
Default Re: Pressure Outlet B.C.
  #3
Larry Clark
Guest
 
Posts: n/a
Generally when the static pressure is set at the outlet the implication is a nozzle or duct type of flow. In this case the other variables are extrapolated from the upstream field points. The entrance conditions need to be set consistent with this outlet BC. Typically one sets the entrance total pressure, total temperature and direction cosines for the velocity components. I do a slight variation on the exit pressure BC. I set the exit pressure as a linear combination of the desired exit pressure and the static pressure at the nearest field cell. This allows the internal field to relax to the specified pressure without forcing it to be exactly set. This allows the flow to carry some curvature out through the exit. This approach usually allows for rapid convergence
  Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
"Pressure Inlet" Boundary Setup Wijaya FLUENT 15 May 18, 2016 11:08
pressure inlet & outlet. help ASAP Plz engahmed Main CFD Forum 0 June 13, 2010 16:34
Help ASAP! pressure inlet & outlet engahmed FLUENT 0 June 13, 2010 16:33
Pressure Rise Error emueller CFX 0 May 5, 2009 12:08
Which B.C. i should apply for this problem?urgent raivish FLUENT 0 January 6, 2006 09:48


All times are GMT -4. The time now is 09:23.