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

Problems about streamline in the axial diffuser

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 27, 2014, 13:51
Unhappy Problems about streamline in the axial diffuser
  #1
New Member
 
shaodong
Join Date: Jun 2013
Posts: 4
Rep Power: 13
starhunter521 is on a distinguished road
Hi, all.
This is my simulation of one centrifugal compressor. The BC of inlet is 1 atm for total pressure, 288.15 K for total temperature, axial direction for flow direction, and the BC of outlet is 3.4 atm for static pressure. The rotating speed of impeller is 28000 rpm.
When I checked the results in the view of B2B in CFD-post, I found the streamline in the axial diffuser was curly (the right one)while the upstream streamline in the radial diffuser (the left one )looked normal. Has anyone got this problem before?

Thank you for reading my post.

starhunter521 is offline   Reply With Quote

Old   May 27, 2014, 20:05
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,868
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
Do you mean the ripples in the streamlines?

This could be a numerical artifact:
* Rerun with a finer mesh
* Converge tighter
* Better mesh quality

and see if it goes away.

OR it could be real. Turbulence transition looks somewhat like that.
ghorrocks is offline   Reply With Quote

Reply

Tags
centrifugal compressor, cfx, diffuser

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
ActuatorDiskExplicitForce in OF2.1. Help be_inspired OpenFOAM Programming & Development 10 September 14, 2018 12:12
[ANSYS Meshing] How to refine a diffuser mesh in axial and circumferential directions seperately ? ulvi90 ANSYS Meshing & Geometry 0 December 10, 2013 09:19
Needed Benchmark Problems for FSI Mechstud Main CFD Forum 4 July 26, 2011 13:13
how to plot out circumferentially mass averaged axial velocity in a rotor? wildli FLUENT 0 July 17, 2010 16:54
About the design of axial fans HanCheolHeui Main CFD Forum 0 September 8, 1998 11:13


All times are GMT -4. The time now is 23:55.