again a 2d car modeling and calculate CD

reza79 · August 5, 2009, 18:30

Hi every body.
I'm working on a project deals with calculating drag coefficient of a car(a 2d model from cross section),
i dont know that where is my mistake that my answer is about 10-20 times smaller than absolute value and is about .015!
first:for calculating CD,should i select all of the car body az an unique body?
second:what should be my boundry condition?
please help me,i'm so confused!
thanks

abrar · October 19, 2009, 16:13

Do u have the dimensions of the car? use farfield b.c.

August 5, 2009, 18:30	again a 2d car modeling and calculate CD	#1
reza79 New Member reza Join Date: Aug 2009 Posts: 2 Rep Power: 0	Hi every body. I'm working on a project deals with calculating drag coefficient of a car(a 2d model from cross section), i dont know that where is my mistake that my answer is about 10-20 times smaller than absolute value and is about .015! first:for calculating CD,should i select all of the car body az an unique body? second:what should be my boundry condition? please help me,i'm so confused! thanks

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October 19, 2009, 16:13		#2
abrar New Member Join Date: Oct 2009 Posts: 2 Rep Power: 0	Do u have the dimensions of the car? use farfield b.c.