Shape-changing bodies in fluid: Hovering, ratcheting, and bursting

Saverio E. Spagnolie, Michael J. Shelley

Research output: Contribution to journalArticle

Abstract

Motivated by recent experiments on the hovering of passive bodies, we demonstrate how a simple shape-changing body can hover or ascend in an oscillating background flow. We study this ratcheting effect through numerical simulations of the two-dimensional Navier-Stokes equations at intermediate Reynolds number. This effect could describe a viable means of locomotion or transport in such environments as a tidal pool with wave-driven sloshing. We also consider the velocity burst achieved by a body through a rapid increase in its aspect ratio, which may contribute to the escape dynamics of such organisms as jellyfish.

Original languageEnglish (US)
Article number013103
JournalPhysics of Fluids
Volume21
Issue number1
DOIs
StatePublished - 2009

ASJC Scopus subject areas

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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