|December 5, 2005, 04:56||
Convergence in timestep
It would be very interesting to hear some different opinions on this issue:
When doing an unsteady calculation, the standard in FLUENT is that convergence within each time step is determined from the values of the scaled residuals, which are scaled by values normally determined at the beginning of the calculation (for example, from acheiveing a steady-state solution to begin from). And these scaling factors do not change when switching between the segregated and coupled solver, for example.
So, I was thinking... 1. Shouldn't scaling be applied within each timestep? Or would that be a too harsh limit on the residuals? 2. Do you generally have to change the scaling factors in any way when switching solver? (I have great difficulties reaching convergence with the coupled solver when starting from a steady-state solution obtained with the segregated solver...)
Thanks in advance!
|Thread||Thread Starter||Forum||Replies||Last Post|
|Convergence||Centurion2011||FLUENT||31||October 25, 2016 04:54|
|Time step dependence of convergence behavior of steady state simulations in CFX||Chander||Main CFD Forum||5||December 23, 2013 06:31|
|Force can not converge||colopolo||CFX||13||October 4, 2011 22:03|
|Convergence of CFX field in FSI analysis||nasdak||CFX||2||June 29, 2009 01:17|
|How to judge convergence at each timestep by LES ?||lcw||FLUENT||0||May 25, 2006 13:42|