Can you post a comparison of the two approaches?
I speculate that a flat plate would have critical angle-of-attack and positioning criteria. I further speculate that a curved plate would approach the result of the airfoil section.
I've been thinking about air curtains on a Geo Metro. It looks like I could add a partial diverter on each side (flushed out to the upper bumper) with curved plates capping the void created.
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