CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Sudden non covergence of k-e

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

LinkBack Thread Tools Display Modes
Old   January 24, 2008, 15:32
Default Sudden non covergence of k-e
Posts: n/a
Dear friends,

I am running a 3d simulation using k-e turbulence model among others. My simulation is unsteady and converges very well maximum 25 iterations until time step 203. After that all the equations including continuity converge except the epsilon (e)equation from the k-e model.

My flow is a two-phase flow. One primary phase and one secondary granular phase.

Can anyone comment on the sudden non convergence of e?

Thanks very much in advance,

  Reply With Quote

Old   January 26, 2008, 08:07
Default Re: Sudden non covergence of k-e
Posts: n/a
what type of flow regime you working with? is it stratified annular, bubbly....etc? what the under-relaxation factor for turbulent dissipation rate (e) you have been used? did you simulate with the VOF model?

  Reply With Quote

Old   January 27, 2008, 08:06
Default Re: Sudden non covergence of k-e
Anastasios Georgoulas
Posts: n/a
No i am simulating a 2 -phase flow using the eulerian mixture model. One phase is sea water (primary)and the other one is fine sand (secondary). I am using the default under relaxation factor.

I used the adaptive time step ption and i noticed that fluent automatically reduces the time step and the solution now is converging more quickly!

  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
Meshing Sudden Contraction and Expansion carldaru ANSYS Meshing & Geometry 33 January 27, 2017 01:56
sudden drop in solver monitor jiguozhao CFX 3 February 27, 2011 06:34
Simulation of suspension flow at sudden contractio QM Main CFD Forum 1 August 5, 2010 15:13
Pressure loss due to sudden expansion in pipe flow Ahmed FLUENT 0 January 2, 2006 11:01
sudden perturbations adarsh Main CFD Forum 0 June 11, 2002 12:08

All times are GMT -4. The time now is 07:02.