Quote:
Originally Posted by JulianEdgar
I've cited the page reference in the (free) paper, an approach that is supported by any current textbook.
If you want to make up some imaginary objection to that, well...
Separated flow has little to do with lift forces on most modern car shapes. If you kept up to date with your readings and understandings, you'd know that.
On the other hand, if you want to keep on pretending that current cars have flow patterns like they did 30 years ago, you can keep on being incorrect.
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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.
