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Old 10-28-2009, 11:18 PM   #15 (permalink)
cfg83
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Join Date: Dec 2007
Location: Southern California
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1999 Saturn SW2 - '99 Saturn SW2 Wagon
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NeilBlanchard -

Quote:
Originally Posted by NeilBlanchard View Post
Hi folks,

Can I ask what is the intended aerodynamic function of these side skirts?

Personally, it feels a bit counterintuitive -- I would think that you want to have air "escape" out from under the car; and not to trap it under the car. And none of the ultra-low Cd cars that I am aware of have anything like this.
My (ever so flawed?) thinking is that I am separating the "clean airstream" from the "bad airstream", but I don't really know. With this mod I think I should create a "snow-plow" air dam to minimize the amount of air flowing under the car. If nothing else, in tandem with an air dam, I think this could be a form of "virtual lowering".

I did some flow simulation YouTubes and found something interesting. The imaging is a top view and is problematic, because none of the "objects" actually touch the ground, they only interfere with the air stream. I was trying to simulate the engine, transmission, suspension, and exhaust piping :



If the above is showing a valid result, then the rear ( non-moving!!! - ) tires seem to have less turbulence associated with them.

CarloSW2
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