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There's a paneled front diffuser thread...
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[citation needed]
I prepared a response yesterday, but it would appear I never hit Submit.
I believe you won't be getting laminar flow anywhere past the stagnation point, in ground effect. Turbulent flow, attached or not, is the domain ground vehicles operate in.
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And furthermore, what is the purpose of causing turbulent attached air on the bottom when the top and sides of the car don't necessarily have turbulent air but it is attached?
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The difference is that the underbody is moving relative to the ground plane. This causes shear forces that aren't experienced by the top, sides and ends. Your better wind tunnels have a moving ground plane for this reason.