Quote:
Originally Posted by aerohead
Incorrect.
The local streamline pressure above the TBL determines the pressure at the separation line, and the pressure of the turbulence, should flow separation without vorticity occur. If vorticity does occur, drag will be even higher.
If the turbulence is unobstructed, it will affect the overall wake pressure, lowering base pressure, raising pressure drag, overall drag.
Low pressure, existing over any horizontal surface will impart lift.
Porsche's Macan would be an example. Mitsubishi's Mirage 'G' model would not.
And the separation is implicated in the Macan's Cd 0.37, vs the Mirage's Cd 0.27. Same basic roofline. One with separation, one without.
As to 'current'. Let's see how GM's reconstituted, 2021 HUMMER measures out. It's best was Cd 0.51 vs Cd 0.70 at it's worst.
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There you go again, just repeating all that you've said for (I imagine) 30+ years.
There is very little flow separation on modern cars - go and do some testing, go and read some current aero textbooks, go and read some current technical papers.
Even go and read the tech paper I referenced in the first post in this thread!
And as for the Macan, you are just making stuff up to support your weird theories. Where is any tuft or smoke testing that shows separated flow on the roof of the Macan?
Oh wait, here's one. Look at all that separated flow on the roof -
not!
It is truly amazing how you just make stuff up.