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Various beautiful images of von Kármán wake combined

The term Kármán vortex street is used in fluid dynamics to describe a repeating pattern of swirling vortices caused by the unsteady separation of flow of a fluid over bluff bodies. It is named after the engineer and fluid dynamicist, Theodore von Kármán.

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Check out some of these flowing in real time with some videos by Teis Fysik: 
Emilio Barreiro Pesado's profile photoStefano Moroni's profile photoYung-Hsiang Huang's profile photothys rademeyer's profile photo
They are so like Mandelbrot erm things.
(b) is particularly interesting.
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