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

Discontinuous contours on R/S interfaces

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 12, 2008, 03:32
Default Discontinuous contours on R/S interfaces
  #1
Rikio
Guest
 
Posts: n/a
Hi, all.

I modelled a two stage centrifugal compressor, and six R/S interfaces exist because of additional two port cavities.The frame change type is Frozen Rotor, and pitch angles are specified for them.

The pressure on inlet and outlet, both static and total, are well agreed with the test data. I used to thought I run the model successfully. But there are discontinuties through R/S interfaces, mainly on total pressure and total temperature. They differed very much. Therefore, velocity and mach number are different across the R/S interfaces.

I can not figure it out why this happen. Can anybody show me some explanations?

Thanks in advance.

Rikio
  Reply With Quote

Old   September 12, 2008, 21:00
Default Re: Discontinuous contours on R/S interfaces
  #2
Rikio
Guest
 
Posts: n/a
I got it. It should take quantities in stn frame into consideration within a MFR system. ^_^
  Reply With Quote

Old   September 13, 2008, 17:01
Default Re: Discontinuous contours on R/S interfaces
  #3
johnny
Guest
 
Posts: n/a
Is there a pitch change on the frozen rotor interface? If so, the profiles get stretched or compressed when crossing the interface. This is documented in the help.
  Reply With Quote

Old   September 15, 2008, 14:21
Default Re: Discontinuous contours on R/S interfaces
  #4
HekLeR
Guest
 
Posts: n/a
a) Use hybrid values not conservative. b) Make sure you compare stationary frame values (apples to apples).
  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
Subdomain or Interfaces (CHT) sandeep_tu CFX 8 July 14, 2009 11:06
grid interfaces kiko FLUENT 0 February 13, 2007 11:28
extension for liquid fraction contours venugopal FLUENT 0 June 11, 2004 01:27
Fluent - discontinuous grid interfaces Simon Archen FLUENT 2 November 16, 2001 10:52
Numerical methods for discontinuous grid interfaces? Hansong Hang Main CFD Forum 12 September 16, 1998 22:26


All times are GMT -4. The time now is 20:03.