lift and drag coefficients around a ground vehicle

January 10, 2008, 17:09

Hi

I need to obtain the lift and drag coefficients of a car directly from the cfx-post. I know how to measure the forces in the three directions x y z with the function calculator(lift, drag and side force), but not on how to obtain the coefficients.

I searched through the archives and found limited info; I mean I learned how to obtain the forces only.

What´s the procedure for the coefficients?

Thanks!

January 10, 2008, 17:32

Hi,

You need density, a reference area and a velocity. You can also get these from CFX-Post. Then calculate the coefficients from there.

Glenn Horrocks

mostafagemy · September 5, 2012, 15:38

hi Pedro ,
I made the simulation on CFD-post but i do not know how to get the forces so can you tell me .

ghorrocks · September 5, 2012, 18:31

Use the function calculator and the force_x/y/z functions.

January 10, 2008, 17:09	lift and drag coefficients around a ground vehicle	#1
Pedro Guest Posts: n/a	Hi I need to obtain the lift and drag coefficients of a car directly from the cfx-post. I know how to measure the forces in the three directions x y z with the function calculator(lift, drag and side force), but not on how to obtain the coefficients. I searched through the archives and found limited info; I mean I learned how to obtain the forces only. What´s the procedure for the coefficients? Thanks!

January 10, 2008, 17:32	Re: lift and drag coefficients around a ground veh	#2
Glenn Horrocks Guest Posts: n/a	Hi, You need density, a reference area and a velocity. You can also get these from CFX-Post. Then calculate the coefficients from there. Glenn Horrocks

September 5, 2012, 15:38	how to get the forces	#3
mostafagemy New Member mostafa Join Date: Sep 2012 Posts: 1 Rep Power: 0	hi Pedro , I made the simulation on CFD-post but i do not know how to get the forces so can you tell me .

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September 5, 2012, 18:31		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,943 Rep Power: 145	Use the function calculator and the force_x/y/z functions.