Courant number for steady state modeling

songpen1985 · October 6, 2009, 04:18

Hi,

As I know courant number has a correlation with time step(C=v×Δt/ΔL). But for steady state modeling, there is no time step setting at all. So, here is my question.

Q: How to understand courant number in steady state modeling?

Thank you!

Philipov · October 6, 2009, 04:33

It depends of what you understand under steady state calculation... for some tasks it is not possible to obtain time independent solution (may be you knowledge about steady state ) so you have a small enough time period in which the solution is transient, but this "picture" is repeated many times in time....
I hope you understand..

songpen1985 · October 6, 2009, 05:00

Philipov,

Thank you so much for your reply. I roughly understand.

Could you please help me to understand this example?

Example: Steady state in density based solver

When we use based solver under steady state, we need to always set Courant number. How to understand this courant number?

Thank you so much!

Philipov · October 6, 2009, 10:03

Do not know from where this statement comes from. May be from the Fluent help files?

October 6, 2009, 04:18	Courant number for steady state modeling	#1
songpen1985 New Member Sean Join Date: Mar 2009 Posts: 15 Rep Power: 17	Hi, As I know courant number has a correlation with time step(C=v×Δt/ΔL). But for steady state modeling, there is no time step setting at all. So, here is my question. Q: How to understand courant number in steady state modeling? Thank you!

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October 6, 2009, 04:33		#2
Philipov Senior Member Svetlin Filipov Join Date: Mar 2009 Location: United Kingdom Posts: 176 Rep Power: 17	It depends of what you understand under steady state calculation... for some tasks it is not possible to obtain time independent solution (may be you knowledge about steady state ) so you have a small enough time period in which the solution is transient, but this "picture" is repeated many times in time.... I hope you understand..

October 6, 2009, 05:00		#3
songpen1985 New Member Sean Join Date: Mar 2009 Posts: 15 Rep Power: 17	Philipov, Thank you so much for your reply. I roughly understand. Could you please help me to understand this example? Example: Steady state in density based solver When we use based solver under steady state, we need to always set Courant number. How to understand this courant number? Thank you so much!

October 6, 2009, 10:03		#4
Philipov Senior Member Svetlin Filipov Join Date: Mar 2009 Location: United Kingdom Posts: 176 Rep Power: 17	Do not know from where this statement comes from. May be from the Fluent help files?