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The wake of two side-by-side square cylinders

Published online by Cambridge University Press:  26 January 2011

Md MAHBUB ALAM ,
Y. ZHOU  and
X. W. WANG
Md MAHBUB ALAM
Affiliation:
Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria 0002, South Africa
Y. ZHOU*
Affiliation:
Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
X. W. WANG
Affiliation:
Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong Key Laboratory of Manufacture and Test Techniques for Automobile Parts, Chongqing University of Technology, China
*
†Email address for correspondence: mmyzhou@inet.polyu.edu.hk
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Abstract

Aerodynamic interference between two cylinders involves most of the generic flow features associated with multiple structures, thus providing an excellent model for gaining physical insight into the wake of multiple cylindrical structures. This work aims to provide an experimental systematic study of the flow behind two side-by-side square cylinders. The square cylinder is a representative model for bluff bodies with sharp corners, characterized by a fixed flow separation point, which are distinct from those of continuous curvature with oscillating separation points, typically represented by the circular cylinder. Experiments were performed at a Reynolds number Re of 4.7 × 104 and a cylinder centre-to-centre spacing ratio T/d (d is the cylinder height) of 1.02–6.00. The flow was measured using different techniques, including hot wires, load cell, particle imaging velocimetry and laser-induced fluorescence flow visualization. Four distinct flow regimes and their corresponding T/d ranges are identified for the first time on the basis of the flow structure and the Strouhal number. Physical aspects in each regime, such as interference between shear layers, gap flow deflection and changeover, multiple flow modes, entrainment, recirculation bubble, vortex interactions and formation lengths, are investigated in detail and are connected to the characteristics of the time-averaged and fluctuating fluid forces. The flow displays a marked difference in many facets from that behind two side-by-side circular cylinders, which is linked to their distinct flow separation natures. A crucial role played by the gap flow and its passage geometry in contributing to the observed difference is also unveiled.

JFM classification

Wakes/Jets: Separated flows Wakes/Jets: Vortex streets

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Type
Papers
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Journal of Fluid Mechanics , Volume 669 , 25 February 2011 , pp. 432 - 471
Copyright
Copyright © Cambridge University Press 2011

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