Okay. Well as interesting as it is that you thought about Reynolds number and Bernoulli.... I'm not exactly sure how either of these relate to this part on the car.
Any kind of in ground effect aerodynamics in F1 is totally against the FIA rules. Anyway you have to consider any body that creates lift sheds a wake. In this case the lift is downwards, so the wake is shed moving with the freestream flow and upwards. And flow going over this part therefore will be affected by this wake, and move upwards, not down under the body.
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Jason Moller
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