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Originally Posted by Cd
why would VW and Audi go through all the trouble of creating the dimples if they did not have a function ?
If they are for rigidity, why choose a dimpled shape versus the more common ridges
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I have a few educated guesses.
It helps rigidity, it's probably easier and lighter to make out of a flat sheet - sharp angles also concentrate stress when thermoforming plastics.
A circle keeps the same aspect from every angle.
Flow underneath the car isn't lengthwise, and the angle will vary with speed.
Ridges will interfere with the actual flow pattern.
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Also of note is how well that VW has tucked the underside into the bumper - nice and flush.
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Looks like they added small VGs on the rear bumper - ccrear1.jpg