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Title: Jellyfish propulsion

Description: Full-field view of an Aurelia aurita jellyfish swimming through a region of dye introduced above the body. Many larger (5 cm to over 2 m) jellyfish generate vortex rings of opposite rotational sense during the contraction and relaxation phases, called starting and stopping vortices, respectively. The downstream propagation of the combined wake vortex rings is reduced by the interaction of this pair of vortices. It is hypothesized that this reduced motion may be useful for keeping prey captured within the vortices closer to the feeding appendages below the animal.

Credits: John O. Dabiri1, Jack Costello2, and Sean Colin3 1Graduate Aeronautical Laboratories & Bioengineering, California Institute of Technology; 2Providence College; and 3Roger Williams Univer


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