The front wheel well covers on my car are piano hinged at the top with 2 low-profile conveyer rollers that contact the side of the tires when they turn sharply. A retraction spring at each lower corner keeps the cover closed when the tires are straight. It only opens for fairly sharp turns. I've been running this setup for about 2 years.
Another approach I have seen is using a stretchy fabric to cover the wheel well with a piece of inner tube rubber sewn in the locations where the tires would rub the fabric.
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