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

Pressure outlet condition?

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 17, 2004, 10:54
Default Pressure outlet condition?
  #1
David
Guest
 
Posts: n/a
I give this pair of inlet & outle boundary conditions, that velocity inlet and pressure outlet, in my case of simulating imcompressible flow of wind tunnel test. I am not sure this two problems:

Could both the operating pressure and the gauge pressure at outlet be set to zero?

And how to set the backflow k & epsilon? Just the same as the inlet ones´╝îand how it effect the results? thanks.
  Reply With Quote

Old   March 18, 2004, 01:26
Default Re: Pressure outlet condition?
  #2
Sohail Ahmed
Guest
 
Posts: n/a
Further to David's question, I need to know whether I can set operating conditions at different x & y coordinates? Please let me know if the outlet/ inlet pressure need to be set by "Operating Conditions" or at the time of initializing the solution? Thanks
  Reply With Quote

Old   March 19, 2004, 03:16
Default Re: Pressure outlet condition?
  #3
J.W.Ryu
Guest
 
Posts: n/a
I know "0" of gauge pressure at outlet means no pressure difference from operating pressure is. If you use 760torr as operating pressure, "0" of gauge pressure at outlet means pressure at outlet is same pressure as operating pressure. If operating presure is "0", pressure effect of flow will not be considered. So, this condition is improper for your model, you may need to change BC for outlet from pressure outlet to outflow. K and e at outlet is depending on your model. If your outlet is far from domain so that flow at this region is stable, and if there is no turbulence, use very small value such as 0.001. Thanks,
  Reply With Quote

Old   March 19, 2004, 05:40
Default Re: Pressure outlet condition?
  #4
Sohail Ahmed
Guest
 
Posts: n/a
Ryu, My question is still unanswered. please advise! Thanks
  Reply With Quote

Reply

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
simple model, difficult outlet Eric CFX 7 May 23, 2014 08:13
Static pressure boundary condition at outlet jennz CFX 4 February 11, 2014 04:29
Setting outlet Pressure boundary condition using CAFFA code Mukund Pondkule Main CFD Forum 0 March 16, 2011 04:23
Using pressure outlet BC Shreyansh FLUENT 0 November 5, 2010 15:57
Natural Convection (Operating Pressure condition) Andrew Tress FLUENT 1 July 3, 2006 18:27


All times are GMT -4. The time now is 02:09.