Development of coherent structures in concentrated suspensions of swimming model micro-organisms

Takuji Ishikawa, J. T. Locsei, T. J. Pedley

研究成果: Article査読

109 被引用数 (Scopus)

抄録

A swimming micro-organism is modelled as a squirming sphere with prescribed tangential surface velocity and referred to as a squirmer. The centre of mass of the sphere may be displaced from the geometric centre, and the effects of inertia and Brownian motion are neglected. The well-known Stokesian dynamics method is modified in order to simulate squirmer motions in a concentrated suspension. The movement of 216 identical squirmers in a concentrated suspension without any imposed flow is simulated in a cubic domain with periodic boundary conditions, and the coherent structures within the suspension are investigated. The results show that (a) a weak aggregation of cells appears as a result of the hydrodynamic interaction between cells; (b) the cells generate collective motions by the hydrodynamic interaction between themselves; and (c) the range and duration of the collective motions depend on the volume fraction and the squirmers' stresslet strengths. These tendencies show good qualitative agreement with previous experiments.

本文言語English
ページ(範囲)401-431
ページ数31
ジャーナルJournal of Fluid Mechanics
615
DOI
出版ステータスPublished - 2008

ASJC Scopus subject areas

  • 凝縮系物理学
  • 材料力学
  • 機械工学

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