Quote:
Originally Posted by Hersbird
Also thinking about the above pic, you can't see but the whole back is very dirty from road spray swirling around behind the square back except on that corner radius. Why is there a clean "pocket" over those edges?
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That's probably an area where the flow has separated but before wake eddies have formed, so no dirt is deposited on the body as air moves past and none is carried back there by recirculation.