title: Shape matters: Near-field fluid mechanics dominate the collective motions of ellipsoidal squirmers.
abstract: Microswimmers show a variety of collective motions. Despite extensive study, questions remain regarding the role of near-field fluid mechanics in collective motion. In this paper, we describe precisely the Stokes flow around hydrodynamically interacting ellipsoidal squirmers in a monolayer suspension. The results showed that various collective motions, such as ordering, aggregation, and whirls, are dominated by the swimming mode and the aspect ratio. The collective motions are mainly induced by near-field fluid mechanics, despite Stokes flow propagation over a long range. These results emphasize the importance of particle shape in collective motion.
authors.affiliation: Department of Bioengineering and Robotics, Tohoku University, Sendai 980-8579, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kyoya
authors.affiliation: Department of Bioengineering and Robotics, Tohoku University, Sendai 980-8579, Japan.
authors.forename: D
authors.initials: D
authors.lastname: Matsunaga
authors.affiliation: Department of Bioengineering and Robotics, Tohoku University, Sendai 980-8579, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Imai
authors.affiliation: Department of Bioengineering and Robotics, Tohoku University, Sendai 980-8579, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Omori
authors.affiliation: Department of Bioengineering and Robotics, Tohoku University, Sendai 980-8579, Japan.|Department of Biomedical Engineering, Tohoku University, Sendai 980-8579, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Ishikawa