this is what wikipedia has on te naca intake
Quote:
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This design is believed to work because the combination of the gentle ramp angle and the curvature profile of the walls creates counter-rotating vortices which deflect the boundary layer away from the intake and draws in the faster moving air, while avoiding the form drag and flow separation that can occur with protruding inlet designs.
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looking at this example it's hard to overlook the similarities between two vg's and a naca intake.
so it's my understanding that they work on the same principle where the vg's reënergise the boundy layer by drawing in air from outside the boundry layer and naca's draw do the same but draw in air below the boundty layer, and the skin.
this suddenly made me think that an upswept lip spoiler ofte found on sporty hatchbacks, but also on car with very low drag quoefficients could be an every simplified vg, epsecially since the once that can be suspected to be there for true aero reasons are often rounded and heigher in the middle
here a picture on my string of thoughts that might make more sence...
but then that last configuration looks like
this test autospeed did
on their hoda insight and they recorded no benefit. but of course the insight is already highly optimised and might not need any band aid somutions as it's basic form is already so good... and all the separation angles are very optimised