Basics of Timescale
Dear All,
Please can anyone tell me why we use Timescale/ Timestep in CFD simulations? Regards |
? what do you mean?
Are you asking why there is temporal discretization in CFD? |
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. |
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. Regards Luke |
Luke,
Thanks a lot. |
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