time step

muthuvelcfd · October 20, 2009, 07:40

hi friends i am new guy for the cfd . I have a doubt? How to calculate time step and physical time in star ccm

tom-uk · October 21, 2009, 13:48

Hi,

Your time step and physical time are your inputs of your problem.
I don't really understand your question.

Thomas

Maddin · October 22, 2009, 16:26

Courant number and velocity of the fluid or other.. what do you want to do?

muthuvelcfd · October 28, 2009, 06:34

Quote:

Originally Posted by Maddin

Courant number and velocity of the fluid or other.. what do you want to do?

my question is how to calculate the time step and phsical time for any problem

Maddin · October 28, 2009, 07:37

As far as I know it isn't possible to calculate it for any problem.
For stream problems you can use the courant number - there you know your time-step.
The time you know because of your velocity there.
How it is on heat transfer problem I don't know.

October 20, 2009, 07:40	time step	#1
muthuvelcfd New Member stephenraj Join Date: Oct 2009 Posts: 7 Rep Power: 17	hi friends i am new guy for the cfd . I have a doubt? How to calculate time step and physical time in star ccm

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October 21, 2009, 13:48		#2
tom-uk New Member thomas Join Date: Jun 2009 Location: Edinburgh Posts: 12 Rep Power: 17	Hi, Your time step and physical time are your inputs of your problem. I don't really understand your question. Thomas

October 22, 2009, 16:26		#3
Maddin Senior Member Join Date: Mar 2009 Posts: 260 Rep Power: 18	Courant number and velocity of the fluid or other.. what do you want to do?

October 28, 2009, 07:37		#5
Maddin Senior Member Join Date: Mar 2009 Posts: 260 Rep Power: 18	As far as I know it isn't possible to calculate it for any problem. For stream problems you can use the courant number - there you know your time-step. The time you know because of your velocity there. How it is on heat transfer problem I don't know.