|March 20, 2012, 13:10||
Join Date: Nov 2010
Posts: 4Rep Power: 5
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, 09:03||
Join Date: Mar 2009
Location: Indiana, US
Posts: 185Rep Power: 6
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.
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