CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > Siemens

outlet boundary

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

LinkBack Thread Tools Search this Thread Display Modes
Old   March 20, 2007, 07:07
Default outlet boundary
Posts: n/a

I am running scalar mixing of air and fuel inside a small tube. When I start the solver I get a message like:

Unless the flow is supersonic the outlet boundary is not well posed.

The flow is not supersonic at the outlet. I get M close to 0.7 near one of the inlets, but the outlet diametre is much larger.

Does anyone know what this could mean?


  Reply With Quote

Old   March 20, 2007, 08:38
Default Re: outlet boundary
Posts: n/a
An outlet boundary can be used for compressible flows only under limited circumstances. There's a section in chapter 6 of the user guide which explains these.
  Reply With Quote

Old   March 20, 2007, 09:10
Default Re: outlet boundary
Posts: n/a
  Reply With Quote

Old   March 20, 2007, 23:02
Default Re: outlet boundary
Posts: n/a
Hi, generally outlet boundaries are not used for compressible flows. This has been the rule for all solvers. Try using a different boundary condition, instead of 'outlet' boundary.
  Reply With Quote


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
Outlet Boundary Conditions for LES garni FLUENT 1 November 29, 2006 14:52
outlet of boundary bluesky CFX 1 August 13, 2002 13:29
outlet boundary condition Arash Main CFD Forum 6 January 4, 2002 09:47
Outlet Boundary Condition Arash Main CFD Forum 4 January 4, 2002 09:41
How to implement B.C. for outlet boundary? Hai-Wen Ge Main CFD Forum 1 November 3, 2001 09:50

All times are GMT -4. The time now is 05:40.