At the end they admit they're only scratching the surface.
Quote:
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Lastly a more detailed investigation of the airflow inside the wheelhouse and around it can be conducted in order to evaluate interaction between ventilation resistance and underbody flow.
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I wrote out this long analysis, but vBulletin ate it. It does that whenever you don't Copy before you Preview.
Anyway, the thick outer radius cover trades places with the full wheel cover in Figures 20 and 21, looking at the combined overall drag.