Helical strake
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A helical strake, also known as a Scruton strake, is a helix-shaped fin arranged along a structure to disrupt fluid flow. It serves to mitigate fatigue by disrupting the vortexes forming a Kármán vort
A two-start helical strake on a chimney
Vortex shedding
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In fluid dynamics, vortex shedding is an oscillating flow that takes place when a fluid such as air or water flows past a bluff body at certain velocities, depending on the size and shape of the body.
Helical strake
…United Kingdom explored the use of helical strakes with rectangular cross-sections as a means of suppressing vortex-induced vibration by disrupting the vortex shedding process. After the success of this experiment, which led to helical strakes sometimes being known as Scruton strakes, subsequent researchers sought to…
Vortex shedding as winds pass Heard Island (bottom left) in the southern Indian Ocean resulted in this Kármán vortex street in the clouds
Regimes of fluid flow across circular cylinder
A helical strake on a chimney stack
Tuned mass damper on top of a chimney