Von Kármán vortex street. Dye in water.
Reference: Perry, A.E., Chong, M.S. & Lim, T.T. (1982) The vortex-shedding process behind two-dimensional bluff bodies, JOURNAL OF FLUID MECHANICS, 77 - 90.
Visit T. T. Lim's web site at http://serve.me.nus.edu.sg/limtt/.
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