Vortex interaction between two tandem flexible propulsors with a paddling-based locomotion

Sung Goon Park, Hyung Jin Sung

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Schooling behaviours among self-propelled animals can benefit propulsion. Inspired by the schooling behaviours of swimming jellyfish, flexible bodies that self-propel through a paddling-based motion were modelled in a tandem configuration. This present study explored the hydrodynamic patterns generated by the interactions between two flexible bodies and the surrounding fluid in the framework of the penalty immersed boundary method. The hydrodynamic patterns produced in the wake revealed flow-mediated interactions between two tandem propulsors, including vortex-vortex and vortex-body interactions. Two tandem flexible propulsors paddling with identical amplitude and frequency produced stable configurations as a result of the flow-mediated interactions. Both the upstream and downstream propulsors benefited from the tandem configuration in terms of the locomotion velocity and the cost, compared with an isolated propulsion system. The interactions were examined as a function of the initial gap distance and the phase difference in the paddling frequency. The equilibrium gap distance between two propulsors remained constant, regardless of the initial gap distance, although it did depend on the phase difference in the paddling frequency.

Original languageEnglish (US)
Pages (from-to)612-632
Number of pages21
JournalJournal of Fluid Mechanics
StatePublished - Apr 25 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016 Cambridge University Press.


  • flow-structure interactions
  • swimming/flying
  • vortex dynamics


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