A numerical study of the benefits of driving jellyfish bells at their natural frequency

Alexander Hoover, Laura Miller

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

A current question in swimming and flight is whether or not driving flexible appendages at their resonant frequency results in faster or more efficient locomotion. It has been suggested that jellyfish swim faster when the bell is driven at its resonant frequency. The goal of this study was to determine whether or not driving a jellyfish bell at its resonant frequency results in a significant increase in swimming velocity. To address this question, the immersed boundary method was used to solve the fully coupled fluid structure interaction problem of a flexible bell in a viscous fluid. Free vibration numerical experiments were used to determine the resonant frequency of the jellyfish bell. The jellyfish bells were then driven at frequencies ranging from above and below the resonant frequency. We found that jellyfish do swim fastest for a given amount of applied force when the bells are driven near their resonant frequency. Nonlinear effects were observed for larger deformations, shifting the optimal frequency to higher than the resonant frequency. We also found that the benefit of resonant forcing decreases for lower Reynolds numbers.

Original languageEnglish (US)
Pages (from-to)13-25
Number of pages13
JournalJournal of Theoretical Biology
Volume374
DOIs
StatePublished - Jun 7 2015
Externally publishedYes

Keywords

  • Animal swimming
  • Biological fluid dynamics
  • Biomechanics
  • Fluid-structure interaction
  • Immersed boundary method

ASJC Scopus subject areas

  • Statistics and Probability
  • Modeling and Simulation
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)
  • Agricultural and Biological Sciences(all)
  • Applied Mathematics

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