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I'm trying to form a structure for under my front bumper that is very similar to the part in the lower half of your attachment.
My thinking is to block the outer opening with a smooth plate on the outside to create a bluff body front end. The center section will have a diverter floor and spats across the front of the tires. The spat will form a converging duct that terminates in a slot at the front of the wheelwell opening.
What this does is form a curtain of air across the wheelwell that acts like a virtual fender skirt. The technique is used on new BMWs and Fords.
The front wheelwells are more problematic than the rear due to the extra volume to allow for steering. To understand what's going on with front wheelwells, observe cars and trucks in pouring rain (like so it's bouncing off the pavement) on the freeway. You'll see a lot of variation, but generally your 'negative pressure' is boiling out of the opening. Sometimes like straight out, especially commercial trucks.
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