Wind and Structures

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The near wake of three circular cylinders in an equilateral triangular arrangement at a low Reynolds number Re=100

  • Bai, Honglei (School of Aeronautics and Astronautics, Sun Yat-sen University (Shenzhen)) ;
  • Lin, Yufeng (WSP (Asia) Ltd) ;
  • Alam, Md. Mahbub (Institute for Turbulence-Noise-Vibration Interaction and Control, Harbin Institute of Technology (Shenzhen))
  • Received : 2019.10.28
  • Accepted : 2020.02.08
  • Published : 2020.05.25
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Abstract

Two-dimensional numerical simulations are conducted at a low Reynolds number Re = 100 to investigate the near wake of three identical circular cylinders that are arranged in an equilateral triangular configuration. The incident angle of the three-cylinder configuration with respect to incoming flow is varied from θ = 0° to 60°, while the spacing between adjacent cylinders (L) covers a wide range of L/D = 1.25-7.0, where D is diameter of the cylinder. Typical flow structures in the near wake of the three-cylinder configuration are identified, including a single Karman vortex street, bistable flip-flopping near wake, anti-phase and/or in-phase vortex shedding, shear layer reattachment, and vortex impingement, depending on the configuration (L/D, θ). The behavior of Strouhal number (St) is discussed in detail, echoing the distinct structures of near wake. Furthermore, fluid forces on the individual cylinders are examined, which, though highly depending on (L/D, θ), exhibit a close correlation to the near wake behavior.

Keywords

Acknowledgement

This work is supported by National Natural Science Foundation of China (NSFC) through grants 11302062 and 11872018.

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