SMOKE FLOW VISUALIZATION
 

Not new, but important that all newer members and guests get a look!
https://www.google.com/search?q=Volk...id:_q6ozALzkF4
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If your eyes are quick you'll catch the comment about 'zero lift' associated with the airfoil. Free graduate degrees to anyone who comprehends it!

well you can definitely see how dirt and snow gets stuck to the rear with that video!

Important that new members have a choice.

duckduckgo.com/?q=Volkswagen%2Bautomotive%2Bwind%2Btunnel%2Bsmoke %2Bflow%2Bvisualization&ia=web

Compare the full Google hyperlink.

I had issues with the original link in both Chrome and Firefox, did a copy & paste when quoting Aerohead.


https://www.youtube.com/watch?v=E9ZSAX56m0E

Same one hopefully.

same one
 

It's different in that, it fails to show the aft-body flow on the VW XL1.
When low drag really mattered, they put a low drag roof on the car, and it didn't need a spoiler, because the pressure recovery of the flow deceleration compensated for the high velocity/ low pressure generated near the windshield header.