Symmetry plane effect on drag coefficient

kdrbrk · July 3, 2009, 07:29

Hi everyone,
I am trying to analyze a car. Of course half of the car, which is divided longitudinally

Lets say reported drag force is 100N. Here is the question...

This force is for:
a. half of the car (total drag force is 100x2=200 N)
b. entire car (total drag force is 100N)

I really need an urgent exact answer for this question. If the answer is "a." then I am in trouble, if the answer is "b." i will be very happy

thanks in advance

-mAx- · July 3, 2009, 07:57

a --> the computed force is the one for the half of your car
But don't forget to apply the symmetry BC, and check if you are well defined your Inlet BC according to the symmetry. (if you work with flow rate (or velocity), take care to set up the half of the attempted value)

kdrbrk · April 17, 2010, 10:19

thank you max !

July 3, 2009, 07:29	Symmetry plane effect on drag coefficient	#1
kdrbrk Member Burak Join Date: May 2009 Posts: 90 Rep Power: 17	Hi everyone, I am trying to analyze a car. Of course half of the car, which is divided longitudinally Lets say reported drag force is 100N. Here is the question... This force is for: a. half of the car (total drag force is 100x2=200 N) b. entire car (total drag force is 100N) I really need an urgent exact answer for this question. If the answer is "a." then I am in trouble, if the answer is "b." i will be very happy thanks in advance

July 3, 2009, 07:57		#2
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	a --> the computed force is the one for the half of your car But don't forget to apply the symmetry BC, and check if you are well defined your Inlet BC according to the symmetry. (if you work with flow rate (or velocity), take care to set up the half of the attempted value) __________________ In memory of my friend Hervé: CFD engineer & freerider

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April 17, 2010, 10:19		#3
kdrbrk Member Burak Join Date: May 2009 Posts: 90 Rep Power: 17	thank you max !