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Originally Posted by nexus_2006
To reduce the low pressure behind the car, I should be looking at box cavity/flow separator kinds of shapes, right? Or should I be looking more at getting flow to wrap around via rear diffuser, slotted spoiler, etc?
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Best would be to 'fill the wake' with a boat tail that reduces the cross section smoothly to a point or vertical line. Next would be a flat truncation. Then the boxed cavity. The Cobra Coupe is a brilliant example of the line between the two. A true boxed cavity uses the low pressure of the wake to suck the boundary around a corner, reducing it's cross section.
A 1930s Dymaxion/Porsche rounded tail doesn't have the Fashenfeld tearing edge the boxed cavity (or late models of Prii) has. So the separation line can be buffeted around. Correction to this would be (purple glowing) plasma actuators or Coanda nozzles.
In the example pic, the Coanda nozzle is that lateral line forward of the smoke wand.
