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Wind and Structures
  Volume 30, Number 5, May 2020, pages 451-463

The near wake of three circular cylinders in an equilateral triangular arrangement at a low Reynolds number Re=100
Honglei Bai, Yufeng Lin and Md. Mahbub Alam

    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.
Key Words
    cylinder near wake; fluid structure interaction
Honglei Bai: School of Aeronautics and Astronautics, Sun Yat-sen University (Shenzhen), Shenzhen, China
Yufeng Lin: WSP (Asia) Ltd, Kowloon Bay, Kowloon, Hong Kong SAR, China
Md. Mahbub Alam: Institute for Turbulence-Noise-Vibration Interaction and Control, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China

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