I fail at finding an example, but I've seen curved strakes on an underbody to sweep air sideways to behind the front wheels. Either it doesn't work or only works in the underbody plenum.
If they follow the predominant airflow, wouldn't they be vortex generators in crossflow conditions.?
If you can carve away the body, airflow can be focused into a jet. My brain needs a better example than the 1959 Chevy.
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