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

Converged solution changes upon restarting

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 28, 2013, 11:49
Default Converged solution changes upon restarting
  #1
New Member
 
athan
Join Date: Aug 2013
Posts: 2
Rep Power: 0
achat is on a distinguished road
Hello:

I am using ANSYS FLUENT v14.0.

i am solving a steady-state, fiber coating problem in a fairly complex geometry with surface reactions. The equations solved are momentum, energy and a few species concentrations. For the low diffusivity cases (low operating tempeartures) I seem to get converged solutions (residuals are very low and plateau out). But when I restart, the converged solution changes: the residuals spike and then they plateau out! This does not happen when diffusivities are high (high T).

Any ideas/suggestions as to why the solution gets 'trapped' in an artificial converged state for the low diffusivity cases? I am using 'coupled' pressure-velocity coupling with second-order upwind.

Thanks
athan
achat is offline   Reply With Quote

Reply

Tags
steady-state convergence

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
grid dependancy gueynard a. Main CFD Forum 19 June 27, 2014 21:22
smoothSolver diverges - solution in using PBiCG solver? makaveli_lcf OpenFOAM Running, Solving & CFD 3 September 11, 2013 12:44
solution is not getting converged Nijanthan FLUENT 5 July 25, 2013 01:42
simple solution converged in 9 iterations? Gabbee90 OpenFOAM Running, Solving & CFD 0 August 6, 2011 23:53
Wall functions Abhijit Tilak Main CFD Forum 6 February 5, 1999 02:16


All times are GMT -4. The time now is 18:20.