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

SOLUTIONS DIVERGE IN FLUENT

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 3, 2008, 23:11
Default SOLUTIONS DIVERGE IN FLUENT
  #1
Rif
Guest
 
Posts: n/a
Hi, I am running an airfoil simulation for NACA 0012 in the cfd code FLUENT. I am using the pressure far field type of boundary condition where the mesh is of the "C" type. When I ran for high MACH number, the simulation goes on smoothly but when i used MACH number 0.04, my solutions diverge till 10e+8. Can anybody tell me how i can remedy this?

Rif
  Reply With Quote

Old   February 4, 2008, 08:11
Default Re: SOLUTIONS DIVERGE IN FLUENT
  #2
Glenn
Guest
 
Posts: n/a
What diverges to 10e+8... continuity?, energy?, turbulence?

  Reply With Quote

Old   February 4, 2008, 11:12
Default Re: SOLUTIONS DIVERGE IN FLUENT
  #3
RIF
Guest
 
Posts: n/a
Energy...
  Reply With Quote

Old   February 4, 2008, 11:39
Default Re: SOLUTIONS DIVERGE IN FLUENT
  #4
Glenn
Guest
 
Posts: n/a
I would suggest starting the solution more gradually, to ramp up on the final flow field. Also, consider reducing the under-ralaxation values for continuity, turbulence and energy in the early iterations of the flow field, until the overall flow field is well established. Then, increase the under-relaxation variables back to normal levels. I think your solution will be stable then. Remember, the actual airfoil did not reach this state instantaneously in the rig test, so the CFD solution solver should not be expected to either!

Hope this helps.... Happy Computing!
  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
How to open Icem mesh in Ansys Fluent? emmkell FLUENT 26 June 9, 2015 15:38
Master node in parallel computing only distirubtion syadgar FLUENT 1 September 8, 2009 16:41
On Bug of Fluent 12.0 lzgwhy FLUENT 0 August 26, 2009 06:41
multiple solutions using Fluent Hanjie Lee FLUENT 3 August 15, 2006 17:21
Integration of a Custom C++ Model into FLUENT Syed Haider FLUENT 1 February 20, 2006 05:49


All times are GMT -4. The time now is 08:01.