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All air impinging below the stagnation point goes under the car. An air dam restricts the opening to the underbody plenum.
Lowering the stagnation point reduces the underbody air. Splitters offer downforce because of the presure of the downward-moving air, but they can offer a new stagnation point.
IIRC there is some advantage to a stepped air dam, a 45 degree bevel at the structural member and a fill plate to the bumper/splitter.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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