Awesome pics and link, thanks. Send more !
Quote:
Originally Posted by Christ
Several of those vehicles' "snow-aero" was influenced by other factors than the straight flow and existing vehicle shape...
While the photos are interesting, they're not scientifically viable at all.
Also, without knowing the approximate wind speed when those shapes were produced, it's impossible to know whether or not the shapes would be ideal for a specific speed over another. Average wind speed creates differing deposition shapes, and is still affected by other factors, such as sheer direction and variable speed, as well as the presence of objects which might create resonance at a given speed, or compress flow between the object of resonance and the object of deposition, which would change the flow profile, and thus, the shape of the deposit.
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Why there are unknown variables (some were influenced by the vehicle in front or behind) the results do agree with testing here and by Hucho.
Note the obvious Kamm effect on the cars. The minivan looks a heck of a lot like "AndrewJ"'s Civic doesn't it????
The places where the wind creates high pressure zones will errode the snow and low pressure zones will cause the wind to slow allowing the snow to stick.
This is a step up from "dirt testing" i guess
"Resonance" ???? What the heck, I thought resonance only occurred within a tract or body not open atmosphere. Are you suggesting they could be skewed by aeroelastic flutter?