期刊
PHYSICS LETTERS A
卷 374, 期 34, 页码 3487-3490出版社
ELSEVIER
DOI: 10.1016/j.physleta.2010.06.043
关键词
Biomixing; Chaotic mixing; Enhanced diffusion
资金
- NSF at WHOI [DMS-0507615, DMS-0806821]
- ONR at WHOI
- Direct For Mathematical & Physical Scien
- Division Of Mathematical Sciences [0806821] Funding Source: National Science Foundation
We consider the stirring of an inviscid fluid caused by the locomotion of bodies through it. The swimmers are approximated by non-interacting cylinders or spheres moving steadily along straight lines. We find the displacement of fluid particles caused by the nearby passage of a swimmer as a function of an impact parameter. We use this to compute the effective diffusion coefficient from the random walk of a fluid particle under the influence of a distribution of swimming bodies. We compare with the results of simulations. For typical sizes, densities and swimming velocities of schools of krill, the effective diffusivity in this model is five times the thermal diffusivity. However, we estimate that viscosity increases this value by two orders of magnitude. (C) 2010 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据