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Stirring by multiple cylinders in potential flow

Published online by Cambridge University Press:  05 April 2016

Zhi Lin  and
Yuanzhao Zhang
Zhi Lin*
Affiliation:
School of Mathematical Sciences, Zhejiang University, Hangzhou, Zhejiang 310027, China
Yuanzhao Zhang
Affiliation:
Department of Engineering Sciences and Applied Mathematics, Northwestern University, Evanston, IL 60208-3125, USA
*
†Email address for correspondence: linzhi80@zju.edu.cn
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Abstract

We consider the enhanced mixing due to multiple cylinders organised in schools moving synchronously in a potential flow. Here simple interactions between cylinders are modelled by the method of image doublets. This is an extension to Thiffeault & Childress’s work (Phys. Lett. A, vol. 374, 2010, pp. 3487–3490) where fluid particle displacements due to non-interacting swimmers were analysed to produce an effective diffusivity that may have a significant impact in ocean mixing. Our results show that schools of two cylinders induce nonlinearly boosted diffusivity compared with the non-interacting case for general configuration parameters, except when they move along a straight line with small separation. We attribute this phenomenon to two different physical mechanisms via which interacting cylinders cooperate to generate long particle drifts depending on their formation. Finally, the effective diffusivity of schools of three or more cylinders in various configurations are also discussed.

JFM classification

Biological Fluid Dynamics: Biological Fluid Dynamics Biological Fluid Dynamics: Micro-organism dynamics Mixing: Mixing
Type
Papers
Information
Journal of Fluid Mechanics , Volume 794 , 10 May 2016 , pp. 552 - 564
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Copyright
© 2016 Cambridge University Press 

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