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The wake of two staggered square cylinders

Published online by Cambridge University Press:  25 July 2016

Md. Mahbub Alam Open the ORCID record for Md. Mahbub Alam [Opens in a new window] ,
Honglei Bai  and
Yu Zhou
Md. Mahbub Alam
Affiliation:
Institute for Turbulence-Noise-Vibration Interaction and Control, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, China Digital Engineering Laboratory of Offshore Equipment, Shenzhen, China
Honglei Bai
Affiliation:
Institute for Turbulence-Noise-Vibration Interaction and Control, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, China Digital Engineering Laboratory of Offshore Equipment, Shenzhen, China
Yu Zhou*
Affiliation:
Institute for Turbulence-Noise-Vibration Interaction and Control, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, China Digital Engineering Laboratory of Offshore Equipment, Shenzhen, China
*
†Email address for correspondence: zhouyu@hitsz.edu.cn
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Abstract

This work aims to provide a systematic experimental study of the wake behind two staggered square cylinders at a Reynolds number $Re=1.3\times 10^{4}$. Four distinct flow regimes, i.e. two single-street modes S-I and S-II and two double-street modes T-I and T-II, are identified based on extensive data, including Strouhal numbers $(St)$, flow structures and their downstream evolution. S-I, S-II and T-II are each further subdivided into two types. The flow characteristics in each regime are presented in terms of shear layer reattachment and impingement, vortex impingement, gap flow behaviour, interaction between cylinders and downstream evolution of the wake. A detailed discussion is made regarding how the physical aspects of the flow are connected to the initial conditions and the $St$ number.

JFM classification

Aerodynamics: Aerodynamics Wakes/Jets: Vortex streets Wakes/Jets: Wakes
Type
Papers
Information
Journal of Fluid Mechanics , Volume 801 , 25 August 2016 , pp. 475 - 507
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Copyright
© 2016 Cambridge University Press 

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Footnotes

‡

Present address: Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China.

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