# calculate each wheel force from total created force

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 April 27, 2012, 05:30 calculate each wheel force from total created force #1 New Member   Join Date: Apr 2012 Posts: 3 Rep Power: 7 Hi CFX specialists, I am simulating an external flow over a vehicle using CFX. Is there any possibility in extracting the resulting forces at the wheels? I have tried functions like force()_x@wheel but you will only receive the resulting forces created on the wheel surface and summed up into the pressure point. Does anybody have an idea? Due to the overdetermined situation (4 wheels) this issue can't be solved by calculations. It can only be roughly approximated. Cheers Carlos

April 27, 2012, 06:16
#2
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Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 13,542
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Quote:
 but you will only receive the resulting forces created on the wheel surface and summed up into the pressure point.
I do not know what this sentence means.

If you are saying the force is for the 4 wheels rather than individual wheels - if you have a mesh primitive for each wheel you can get the force per wheel there, otherwise you will need to edit your mesh so each wheel is a different boundary. Both of these methods will give you the force on each wheel.

 April 29, 2012, 04:20 #3 New Member   Join Date: Apr 2012 Posts: 3 Rep Power: 7 Hey ghorrocks, thanks for your reply! well what I mean is the resulting force distribution of the negative lift force on the whole body. This lift results in down forces at each of the four wheels at the contact area to the road. Having separated components for the wheels I will receive only the force created by the wheel geometry and not the whole body. Having asymmetric aerodynamics on the vehicle (left/right side) I will need to figure out the created side forces at the wheels as well. I once read something like: "torqueX()@location" But I am not sure how to use it cause I have four wheels in my model and differing down forces at each side. Cheers Carlos

 April 29, 2012, 06:52 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,542 Rep Power: 104 My previous post said what your options are - use mesh primitives if they exist, otherwise you will need to define a different boundary pathc for each wall. Then it is a trivial matter to get the forces and moments of each tyre individually.

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