Quote:
Originally Posted by aerohead
I believe that the ability to generate the ring-vortex is predicated upon having the semi-elliptical body cross-section. I have no confidence that a rectangular section could support such annular vorticity.
...Need more data.
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See figure 12 in
2012 Khalighi et al.
Unsteady Aerodynamic Flow Investigation Around a Simplified Square-Back Road Vehicle With Drag Reduction Devices J. Fluids Eng. Jun 2012, 134(6)
for a very good approximation of a rectangular body induced vortex ring.
In any case, to some degree a rear tail could transition the flow away from rectangular -some tails are well radiused.