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Old 04-23-2020, 02:28 AM   #2 (permalink)
JulianEdgar
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Good find. Note that the graph you have shown simply displays the difference in CFD prediction vs wind tunnel results (ie the error) - not the actual changes in drag.

Versus the standard rim (wind tunnel results):
  • fully blanked - Cd change of -0.013
  • 85mm annular outer ring - Cd change of -0.009

So the Jaguar results are different to the Tesla results (where fully covered wheels increased drag), which in turn are different to the SAE 2011-01-0165 results (where ventilated front and fully covered rear wheels gave the best result).

As I wrote in the other thread:

To make it clear, based on the research I have cited in the book, I am not saying that fully covered wheels are bad. What I am saying is that fully-covered wheels aren't always best.

I am guessing it's highly dependent on the car to which the wheels are fitted.

Last edited by JulianEdgar; 04-23-2020 at 03:42 AM..
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