CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Divergence Problems

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

LinkBack Thread Tools Display Modes
Old   December 12, 2006, 17:40
Default Divergence Problems
Posts: n/a
I'm basically a novice with FLUENT and am having some problems getting the solution for a 3D model to converge. The geometry is pretty simple, basically just flow through a rectangular test section, over a step. The air velocities are pretty high (around 140 m/s). I've gone through all of the FLUENT tutorial sections for compressible flow, but nothing seems to be working. For some reason my energy equation and/or continuity equation solutions are always divergent. Is there a common cause and solution to this?
  Reply With Quote

Old   December 13, 2006, 09:55
Default Re: Divergence Problems
Posts: n/a
Common cause is the mesh. Look at the diverged solution to find where the model is falling apart and look at mesh size in that area. Are the cells small enough in that area to approximate the curvature?

Other possible causes are solver settings, solution process (i.e. what settings you change and when), boundary conditions, or model setup. Post more about your setup (solver, models, BCs, etc...) and people will be able to comment on that.

Good luck, Jason
  Reply With Quote

Old   January 5, 2007, 00:18
Default Re: Divergence Problems
Posts: n/a
agreed with Jason. which model you are using? Solver? convergence criterion settings, etc.....
  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
[ICEM] Problems with coedge curves and surfaces tommymoose ANSYS Meshing & Geometry 0 August 5, 2011 16:02
Problems modeling vertical axid water turbine- divergence in AMG solvers gambiss FLUENT 1 March 13, 2011 14:05
Divergence problems with interface in 2D transonic external flow drrbradford FLUENT 1 June 23, 2010 11:09
divergence problems Kaatje FLUENT 3 January 23, 2006 14:50
problems simulation ideal gas, divergence in AMG S Ralf Schmidt FLUENT 11 October 1, 2005 13:21

All times are GMT -4. The time now is 17:14.