Spanwise Lift post-processing

realanony87 · June 19, 2009, 07:47

Hello guys. I simulated flow around a 3D wing and I am post processing the results.
Does the force_norm function in CFX ansys give the Force per unit meter one could use to get the lift distribution along the wing ? Or is it better to specify user surfaces from contours (contours of spanwise Z direction ) to cut the wing into sections and extract the total force acting on each user surface ?
The problem with the 2nd option is with me when I try to extract a force on the user surface it hangs CFX for 10 mins for the first calculation , before it gives the result.
Which technique do you guys use ?

ghorrocks · June 19, 2009, 08:01

Hi,

Read the documentation about the force_norm function. I am not sure but I think it only gives you the direction of the force vector.

The best way to extract the data you want is as you suggest - make user surfaces and do force operations on each user surface.

Glenn Horrocks

June 19, 2009, 07:47	Spanwise Lift post-processing	#1
realanony87 New Member Join Date: May 2009 Posts: 21 Rep Power: 17	Hello guys. I simulated flow around a 3D wing and I am post processing the results. Does the force_norm function in CFX ansys give the Force per unit meter one could use to get the lift distribution along the wing ? Or is it better to specify user surfaces from contours (contours of spanwise Z direction ) to cut the wing into sections and extract the total force acting on each user surface ? The problem with the 2nd option is with me when I try to extract a force on the user surface it hangs CFX for 10 mins for the first calculation , before it gives the result. Which technique do you guys use ?

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June 19, 2009, 08:01		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	Hi, Read the documentation about the force_norm function. I am not sure but I think it only gives you the direction of the force vector. The best way to extract the data you want is as you suggest - make user surfaces and do force operations on each user surface. Glenn Horrocks