History, Politics And Current Affairs

The 'classic' example is that spiral ridge around slim chimneys.

This guy has gone two better, made a truly remarkable improvement to foils etc.

Gyroid as a novel approach to suppress vortex shedding and mitigate induced vibration
https://techxplore.com/news/2025-09-cle ... ating.html
https://www.nature.com/articles/s41598-025-11199-0

Nik-note: Nature report is 'open access'.

Quickly scanned it, is there some fundamental reason why a gyroid is good? would a general rough surface work?

The PhysOrg report hints, and what I understood of the linked Nature article extended, that similar 'treatments' have been deployed before, albeit to much lesser effect.

IIRC, saw-tooth & kin work to lesser extent over limited flow range(s): Gotta stay near their 'sweet spot'.

My take is that a gyroid has two (2) opposing shapes, so adjacent pairs reliably produce locally opposing micro-wakes. These cancel each-other before vortex train can become big enough to be scary.

I suppose a rough analogy would be how magnets in Halbach arrays are arranged to seem 'One Sided' beyond 'near field'...

Like wind-screen wipers, you'd have to slide strips off to clean / recycle...