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10) there exists, some critical skin roughness which mimics what optimized vortex generators, ... would produce, to enhance this flow attachment.
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I've always wondered about the optimum for geodesic domes. A sphere has one Cd and an icosahedron [perhaps] another. Is there is a sweet spot (mayhap around 2v or 3v) where the angular edges promote reattachment as on the Cybertruck and the overall drag is at minimum?
I can't find a Cd for an icosahedron, but a cube's Cd varies quite a bit with it's orientation.