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Do flat plates (A) result in less drag than concave surfaces (B)?

Intuitively, i think flat plates produces less drag than concave surface because the concave surface makes the fluid move backwards, while the flat plate does not.

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marked as duplicate by Thomas Fritsch, stafusa, thermomagnetic condensed boson, ZeroTheHero, Kyle Kanos Aug 23 at 9:57

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  • $\begingroup$ It might help if you provide a link to a reference (i.e. lab testing) that shows that B does cause more drag. $\endgroup$ – Time4Tea Aug 20 at 13:49