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musman May 15, 2009 09:45

cfx post process help
 
hello i need help to get result like cl cd and cm from cfx post process and cp curve urgent thanks

Jules May 18, 2009 06:31

Muhammad,
please describe your problem more clearly. What are you simulating? An airfoil?
Besides that, reading the manual to CFX Post would definitely answer the question for you.
A little hint: Use a CEL expression like:
force_y()@airfoil_surface to calculate the vertical force. Replace "airfoil_surface" with whatever name the airfoil surface wall boundary has in your simulation. Use inlet velocity and density at inlet and the definition of cL to calculate cL. Do the same with force_x for the drag coefficient. Use a similar approach for cM. (Not sure if there's a direct function for calculating the moment, refer to the manual)

Good luck,

Jules

LSC May 19, 2009 00:29

Hi, just to clarify that the inlet velocity refers to free stream velocity right?

Jules May 19, 2009 05:01

Quote:

Originally Posted by LSC (Post 216570)
Hi, just to clarify that the inlet velocity refers to free stream velocity right?

Of course. Sorry for my sloppy writing. But in a usual airfoil simulation setup, these two are equivalent.

Jules


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