My attempt at an air curtain. I got this far, the system crashed and I never went back to it.
The outer face is flat but the air dam is compound curved to form a converging duct.
edit:
I just learned of the Bugatti Divo.
https://www.4legend.com/2018/paris-2...a-bugatti-divo
Bugatti's modeling skills are superior to mine.
But the concept of the splitter upturned into a shark-fin shape open at the top is there.