CFD Online Logo CFD Online URL
Home > Forums > CFX

CFX for low subsonic regime

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

LinkBack Thread Tools Display Modes
Old   January 11, 2009, 03:37
Default CFX for low subsonic regime
Posts: n/a
Is CFX good for low subsonic regime or more precisely for mix of low subsonic, transonic and supersonic flow regimes. because i am getting the difficultly in simulating the large plenum volume (where flow is nearly static) and to outlet where flow is at mach no of 0.4-0.9.

Any suggetions will be highly appreciated.

Regards SA
  Reply With Quote

Old   January 11, 2009, 15:40
Default Re: CFX for low subsonic regime
Posts: n/a
CFX can solve subsonic, transonic, or supersonic flows. I think your issue is that you have such a wide range of timescales in this problem - it would make sense that you are having difficulties in getting convergence in CFX. You will probably need to play around with some settings in order to get a converged solution.

You may need to start the run with a local timescale factor, then switch it over to a physical timescale.

If you have transonic/supersonic flow, it might make sense to run the case with boundary conditions such that the flow is subsonic. Then once that case is converged, gradually increase the bc's to get the desired operating conditions.

  Reply With Quote

Old   January 12, 2009, 08:36
Default Re: CFX for low subsonic regime
Posts: n/a
Thanks johnny for your quick response.

what is local time scale factor and how it affects the solution.

actually i am simulating the super sonic wind tunnel with inlet large tank (where flow is almost stationary) but in test section flow is super sonic. any suggestions?

best regards

  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
How to Check Mass Flow Rate in 2D Analysis - CFX nasir FLUENT 0 October 9, 2011 02:52
Flow regime dvolkind Main CFD Forum 8 August 16, 2011 13:11
in CFX, how to define a inlet condition of feedback control flow rate ? suihenry CFX 12 May 14, 2009 17:59
demo free flow blunt body in cfx ansys 11 jan CFX 1 July 31, 2007 19:44
fluid flow fundas ram Main CFD Forum 5 June 17, 2000 21:31

All times are GMT -4. The time now is 15:51.