Julian Edgar likes bellmouths that are completely rolled. On an inlet.
So you think a flat diffuser with diverging sides or a curved diffuser with flat sides will form vortexes? What if instead of a rectangular section it's a half circle or flattened oval?
It seems like the thing would be to match the velocity of the air from under the car with the air over the car. even if there's a flat plate in between. Or a concave/convex plate with the tearing edges.
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