|March 20, 2012, 12:10||
Join Date: Nov 2010
Posts: 9Rep Power: 0
For example in CFX we use Physical / Automatic Timescale or in FLuent we used Timestep.
I just want to know that what is the purpose of using timescale.
|March 22, 2012, 08:03||
Join Date: Mar 2009
Location: Indiana, US
Posts: 185Rep Power: 9
Firstly, a timescale is used in CFX as it is a fully implicit solver AND in Fluent (for the explicit solver) it uses relaxation factors.
The idea is to under relax your discretized equations as your solution proceeds to a steady state converged state. By under-relaxing your variables you are allowing only a part of the old value to be used to calculate the new value and so on so that your solution doesn't go out of hand and diverge.
I hope this makes sense to you.
In CFX the timescale refers to this under relaxation and is in no way related to the transient timestep.
|Thread||Thread Starter||Forum||Replies||Last Post|
|When to use local timescale or physical timescale||xyq102296||CFX||23||June 25, 2014 07:55|
|Determination of physical timescale||Chander||CFX||2||October 19, 2011 19:47|
|Timescale for rotating harware with long domains||aerost||CFX||1||July 20, 2010 23:42|
|Solid Timescale Control||Parthipan||CFX||2||August 24, 2007 10:07|
|Advice on Physical Timescale||Oli||CFX||0||January 16, 2007 11:41|