Diffusion and spatial correlations in suspensions of swimming particles

Details Diffusion and spatial correlations in suspensions of swimming particles Diffusion and spatial correlations in suspensions of swimming particles

2008-05-24

arxiv.org/abs/0805.3784v1

Phys. Rev. Lett. 100, 248101 (2008)

Physics

Condensed Matter

Soft Condensed Matter

10 pages, 3 figures, to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.100.248101

Populations of swimming microorganisms produce fluid motions that lead to dramatically enhanced diffusion of tracer particles. Using simulations of suspensions of swimming particles in a periodic domain, we capture this effect and show that it depends qualitatively on the mode of swimming: swimmers ``pushed'' from behind by their flagella show greater enhancement than swimmers that are ``pulled'' from the front. The difference is manifested by an increase, that only occurs for pushers, of the diffusivity of passive tracers and the velocity correlation length with the size of the periodic domain. A physical argument supported by a mean field theory sheds light on the origin of these effects.

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