An experimental and numerical study on flagellar spiral motion

Naoki Ono, Hirotaka Fukushima, Yusuke Inui

Research output: Contribution to journalArticlepeer-review


Microbes can move smoothly in water environment with high efficiency, which could offer innovative ideas for micro hydro machines in future. In this study, we investigated the spiral movement of flagellum by using numerical and exerimental models. We simulated a microbe's fluid environment of Re number of 10-4. The model study revealed that the maximum values of driving force and fluid velocity appeared depending on the model's roll number and spiral diameter. The occurrence of the maximum was explained by the two competing factors, which were the increase in longitudinal velocity and the decrease of spiral wave velocity as the roll number increased.

Original languageEnglish
Pages (from-to)1862-1869
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number771
Publication statusPublished - 2010 Nov


  • CFD
  • Euglena
  • Flagellum
  • Reynolds number
  • Scaling law
  • Spiral motion

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering


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