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aerodynamics, airflow, pressure zones etc

911 Views 2 Replies 3 Participants Last post by  BlownGsR1001
That was the best title I could come up with...And this is the part where I wish I had payed more attention in physics, or got a degree in engineering.

While this may be a bit too complicated to explain in the means of a forum thread, I figured I would give it a shot.

I am trying to figure out the basics of air flow dynamics (fluid dynamics)- ie- what causes low pressure areas, high pressure areas when flowing around objects, through things does air flow in relation to different shapes. I know some basics like pressure always flows from high to low, and the bernoulli effect and creating lift etc. But I'm more concerned about the flow of air in and around the complex parts and surfaces that make up the front ends of cars, or more specifically our integras.

For example, if you look at factory turbocharged vehicles, more specifically the eclipse and supra that had side mounted intercoolers...I have read that they were very efficient in these locations because there is ducting that goes from the front of the bumper to the intercooler, then ducting behind it that ended up in the fender just infront of the front wheel. The wheel created a very low pressure zone (for whatever reason, what I'm trying to figure out) and this in addition to the high pressure zone in front of the car and duct at the front, created a great deal of flow across the intercooler.

What I would like to do is figure out a way that if I fabbed up some ducting that I could mount say an oil cooler in the front fender near the front wheel- and would have good flow due to the pressure zones in effect on it.

-What causes low pressure?
-What causes high pressure?
-Is there in fact a low pressure zone in front of a spinning wheel?
-What effects flow/pressure, etc?

I know these can be indeffinately much so that there could be a class on it- Fluid Dynamics...I know I should probably go get a high level physics book...So any help/insight/direction would be great. I found a few resources, but they were either way too complicated, or I needed to order some outlandishly expensive book...

Little something i found
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As far as the side mount intercooler goes, the low pressure is created by the induced air velocity from the tire. This is Bernuli's in it's simpilest form (High V, Low P). It's the same reason that planes create lift. To get to the higher velocity zone the air molecules must accelerate, but they have to "take their turn" so when the first goes faster it leaves the second one in the dust, thus spacing out the molecules, and creating a low pressure zone. PM me if you have any further questions...some might say an engineering degree counts for something : )
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