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Ground effect
The 'mirror image' was an approximation the early wind tunnel using engineers used to address the 'moving road surface' problem without having a moving surface neath the car.
The 'partial mirror image' I threw in is in homage to this old idea, I wonder if it has any use? It seems to cause some interesting effects at the rear of the car, the 'bounce' seems to push some mixing back up into otherwise semi-laminar flow areas at the top of the hatch/KAMM area.
I'm really just learning to use this tool, it is lots of fun, even if it is not 'reality'.
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