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Open AccessArticle

Hydrodynamics of Vortex Generation during Bell Contraction by the Hydromedusa Eutonina indicans (Romanes, 1876)

Biology Department, Providence College, Providence, RI 02918, USA
Whitman Center, Marine Biological Laboratory, Woods Hole, MA 02543, USA
Marine Biology/Environmental Sciences, Roger Williams University, Bristol, RI 02809, USA
Department of Integrative Biology, University of South Florida, Tampa, FL 66320, USA
School of Engineering, Stanford University, Stanford, CA 94306, USA
Author to whom correspondence should be addressed.
Biomimetics 2019, 4(3), 44;
Received: 28 May 2019 / Revised: 29 June 2019 / Accepted: 2 July 2019 / Published: 5 July 2019
(This article belongs to the Special Issue Fluid Dynamic Interactions in Biological and Bioinspired Propulsion)
Swimming bell kinematics and hydrodynamic wake structures were documented during multiple pulsation cycles of a Eutonina indicans (Romanes, 1876) medusa swimming in a predominantly linear path. Bell contractions produced pairs of vortex rings with opposite rotational sense. Analyses of the momentum flux in these wake structures demonstrated that vortex dynamics related directly to variations in the medusa swimming speed. Furthermore, a bulk of the momentum flux in the wake was concentrated spatially at the interfaces between oppositely rotating vortices rings. Similar thrust-producing wake structures have been described in models of fish swimming, which posit vortex rings as vehicles for energy transport from locations of body bending to regions where interacting pairs of opposite-sign vortex rings accelerate the flow into linear propulsive jets. These findings support efforts toward soft robotic biomimetic propulsion. View Full-Text
Keywords: swimming; vortex rings; wakes swimming; vortex rings; wakes
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Costello, J.H.; Colin, S.P.; Gemmell, B.J.; Dabiri, J.O. Hydrodynamics of Vortex Generation during Bell Contraction by the Hydromedusa Eutonina indicans (Romanes, 1876). Biomimetics 2019, 4, 44.

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