'air curtains'
Just to confuse you even more, I posted a link to the 2024 Ferrari Purosangue SUV, which has the most elaborate system of front and rear air curtains I've seen on a 'production' car.
CFD would be the best way to engineer these systems, but also very expensive.
Perhaps the Ferrari will offer more grist for you to ponder.
Front and rear skirts remain the 'ne plus ultra' drag-wise, but they're not for everyone.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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