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Hydrodynamic interactions of self-propelled swimmers

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Soft Matter Vol - 9 Issue - 9

Soft Matter Vol - 9 Issue - 8

Soft Matter Vol - 9 Issue - 7

Soft Matter Vol - 9 Issue - 6

Soft Matter Vol - 9 Issue - 5

Hydrodynamic interactions of self-propelled swimmers

Content Provider	Royal Society of Chemistry (RSC)
Author	Molina, John J. Yamamoto, Ryoichi Nakayama, Yasuya
Copyright Year	2013
Abstract	The hydrodynamic interactions of a suspension of self-propelled particles are studied using a direct numerical simulation method which simultaneously solves for the host fluid and the swimming particles. A modified version of the “Smoothed Profile” (SP) method is developed to simulate microswimmers as squirmers, which are spherical particles with a specified surface-tangential slip velocity between the particles and the fluid. This simplified swimming model allows one to represent different types of propulsion (pullers and pushers) and is thus ideal to study the hydrodynamic interactions among swimmers. We use the SP method to study the diffusive behavior which arises due to the swimming motion of the particles, and show that there are two basic mechanisms responsible for this phenomena: the hydrodynamic interactions caused by the squirming motion of the particles, and the particle–particle collisions. This dual nature gives rise to two distinct time- and length-scales, and thus to two diffusion coefficients, which we obtain by a suitable analysis of the swimming motion. We show that the collisions between swimmers can be interpreted in terms of binary collisions, in which the effective collision radius is reduced due to the collision dynamics of swimming particles in viscous fluids. At short time-scales, the dynamics of the swimmer is analogous to that of an inert tracer particle in a swimming suspension, in which the diffusive motion is caused by fluid-particle collisions. Our results, along with the simulation method we have introduced, will allow us to gain a better understanding of the complex hydrodynamic interactions of self-propelled swimmers.
Starting Page	4923
Ending Page	4936
Page Count	14
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	9
Issue Number	19
Journal	Soft Matter
DOI	10.1039/c3sm00140g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Direct numerical simulation Paralympic swimming Diffusion Self-propelled particles
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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