Head-on collision of vortex rings (Re = 1000). Dye in water.
Reference: Lim, T. T. & Nickels, T. B. (1992) Instability and reconnection in the head-on collision of two vortex rings.Ê NATURE, Vol. 357.Ê
Visit T. T. Lim's web site at http://serve.me.nus.edu.sg/limtt/.
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