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Vortex shedding as winds pass Heard Island (bottom left) in the southern Indian Ocean resulted in this Kármán vortex street in the clouds
Vortex shedding as winds pass Heard Island (bottom left) in the southern Indian Ocean resulted in this Kármán vortex street in the clouds
A helical strake on a chimney stack
A helical strake on a chimney stack
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The transition from laminar to turbulent flow
The transition from laminar to turbulent flow