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It is better to cover the wheels.
With the cover, you can then design, if you are allowed, ways to minimise the drag / lift with shapes.
I found is a short video I online which kind of shows what is going on.
Search for "FlowVision CFD Car with Rotating Wheels" on youTube - I'm too new around here so can't post links yet!
The static image at 30secs is worth a study, but remember how dynamic the airflow was from the video.
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