Quote:
Originally Posted by Phase
https://core.ac.uk/download/pdf/211225703.pdf
seems like fully closed wheels increase the base pressure at the rear of the car. they also prevent air from coming out of the rims and feeding into the jetting vortex behind the wheel
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Any turbulence created along the body robs from the total available streamline energy, turning it into heat. This lost energy can never be converted back into useful pressure, capable of reducing pressure drag.
So anything done, anywhere on the body to reduce separation and it's attendant turbulence or vortices is money in the bank.