Fluid dynamics: Lord Kelvin's vortex rings

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Nature Physics
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Linking two smoke rings or tying a single ring into a knot is no easy feat. Such topological vortices are now created in water with the aid of specially printed hydrofoils.


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  1. Daniel P. Lathrop and Barbara Brawn-Cinani are at the Institute for Research in Electronics and Applied Physics, Energy Research Facility, Bldg. #223, Paint Branch Drive, University of Maryland, College Park, Maryland 20742-3511, USA

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