Gyrotaxis in a Steady Vortical Flow

被引：72

作者：

Durham, William M. ^{[1
]}

Climent, Eric ^{[2
]}

Stocker, Roman ^{[1
]}

机构：

[1] MIT, Dept Civil & Environm Engn, Cambridge, MA 02139 USA

[2] Univ Toulouse, Inst Mecan Fluides, INPT, UPS,CNRS, F-31400 Toulouse, France

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 23期

关键词：

SPATIAL HETEROGENEITY; HEAVY-PARTICLES; MICROORGANISMS; MICROPLANKTON; TURBULENCE; LAYERS;

D O I：

10.1103/PhysRevLett.106.238102

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We show that gyrotactic motility within a steady vortical flow leads to tightly clustered aggregations of microorganisms. Two dimensionless numbers, characterizing the relative swimming speed and stability against overturning by vorticity, govern the coupling between motility and flow. Exploration of parameter space reveals a striking array of patchiness regimes. Aggregations are found to form within a few overturning time scales, suggesting that vortical flows might be capable of efficiently separating species with different motility characteristics.

引用

页数：4

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