Counter-rotating vortices cancel each other resulting so no vortex. But also help to settle turbulence coming from the interface of the halo and tub. Or the two vortices split and run either side of the helmet and thus tidy up the flow generally.bhall II wrote: ↑12 Mar 2026, 10:17Can anyone think of a reason why it might be beneficial to shed counter-rotating vortices onto a driver’s face?
https://i.imgur.com/oIEszOB.jpeg
