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Abstract: We present simulations of the vortex dynamics associated with theself-propelled motion of jellyfish. The geometry is obtained from imagesegmentation of video recordings from live jellyfish. The numerical simulationsare performed using three-dimensional viscous, vortex particle methods withBrinkman penalization to impose the kinematics of the jellyfish motion. Westudy two types of strokes recorded in the experiment1. The first type strokeA produces two vortex rings during the stroke: one outside the bell during thepower stroke and one inside the bell during the recovery stroke. The secondtype stroke B produces three vortex rings: one ring during the power strokeand two vortex rings during the recovery stroke. Both strokes propel thejellyfish, with stroke B producing the highest velocity. The speed of thejellyfish scales with the square root of the Reynolds number. The simulationsare visualized in a fluid dynamics video.



Autor: J. T. Rasmussen, D. Rosinelli, F. Storti, P. Koumoutsakos, J. H. Walther

Fuente: https://arxiv.org/







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