Quote:
Originally Posted by viio
Well I modelled 3 holes into my 1:1 scale 3d model of my car, and ran CFD on it. The holes cut through the bumper and come out in the space behind it which catches some airflow near the spare wheel. The colour contours show air velocity at the back of the car.
Forgive me if I don't rush out and grab a drill - can't see much of a difference.
If anything, the top model (with the holes) appears to have a larger area of low velocity air - hence more drag.
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How representative is your model to the under side of your car? Can we see a view from the bottom of the car to see what the pressure is like on the front of the bumper near the holes?