Cited by 68Biomimetic flight and propulsion mechanismsMarine Invertebrate Physiology and EcologyFluid Dynamics and Turbulent Flows

Flow structures and fluid transport for the hydromedusae Sarsia tubulosa and Aequorea victoria

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Lipinski, Doug, Mohseni, Kamran·2009·Journal of Experimental Biology

Abstract

The flow structures produced by the hydromedusae Sarsia tubulosa and Aequorea victoria are examined using direct numerical simulation and Lagrangian coherent structures (LCS). Body motion of each hydromedusa is digitized and input to a CFD program. Sarsia tubulosa uses a jetting type of propulsion, emitting a single, strong, fast-moving vortex ring during each swimming cycle while a secondary vortex of opposite rotation remains trapped within the subumbrellar region. The ejected vortex is highly energetic and moves away from the hydromedusa very rapidly. Conversely, A. victoria, a paddling type hydromedusa, is found to draw fluid from the upper bell surface and eject this fluid in pairs of counter-rotating, slow-moving vortices near the bell margins. Unlike S. tubulosa, both vortices are ejected during the swimming cycle of A. victoria and linger in the tentacle region. In fact, we find that A. victoria and S. tubulosa swim with Strouhal numbers of 1.1 and 0.1, respectively. This means that vortices produced by A. victoria remain in the tentacle region roughly 10 times as long as those produced by S. tubulosa, which presents an excellent feeding opportunity during swimming for A. victoria. Finally, we examine the pressure on the interior bell surface of both hydromedusae and the velocity profile in the wake. We find that S. tubulosa produces very uniform pressure on the interior of the bell as well as a very uniform jet velocity across the velar opening. This type of swimming can be well approximated by a slug model, but A. victoria creates more complicated pressure and velocity profiles. We are also able to estimate the power output of S. tubulosa and find good agreement with other hydromedusan power outputs. All results are based on numerical simulations of the swimming jellyfish.

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  1. Mohseni, K. (2004). Pulsatile jets for unmanned underwater maneuvering. AIAA paper 2004-6386, Chicago, IL. 3rd AIAA Unmanned Unlimited Technical Conference, Workshop and Exhibit.

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Authors
Lipinski, D., & Mohseni, K.
Affiliations
University of Colorado Boulder (US)
Corresponding author
Mohseni, Kamran
Venue
Journal of Experimental Biology
Published
2009-08-01
Volume
212
Issue
15
Pages
2436-2447
ISSN
  • 0022-0949 (ISSN-L)
  • 1477-9145
OpenAlex
W2141836389
Cited by
68
References
45
Citations by year
2026: 1 · 2024: 1 · 2023: 3 · 2022: 3 · 2021: 6 · 2020: 3 · 2019: 5 · 2018: 1 · 2017: 3 · 2016: 2 · 2015: 8 · 2014: 2 · 2013: 7 · 2012: 7
FWCI
14.87
Type
journal article
Language
en
Open access
Locations
  • Journal of Experimental Biology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Engineering › Aerospace Engineering › Biomimetic flight and propulsion mechanisms
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Marine Invertebrate Physiology and Ecology
  • Physical Sciences › Engineering › Computational Mechanics › Fluid Dynamics and Turbulent Flows
Keywords
Sarsia tubulosa, Aequorea victoria, hydromedusae, jellyfish swimming, jet propulsion, Strouhal number, Lagrangian coherent structures, wake flow, fluid transport, feeding
MeSH terms
Animals, Biological Transport, Swimming, Water Movements, Hydrozoa

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