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http://dx.doi.org/10.12989/was.2020.30.5.533

Large Eddy Simulation of the flow around a finite-length square cylinder with free-end slot suction  

Wang, Hanfeng (School of Civil Engineering, Central South University)
Zeng, Lingwei (School of Civil Engineering, Central South University)
Alam, Md. Mahbub (Institute for Turbulence-Noise-Vibration Interaction and Control, Harbin Institute of Technology (Shenzhen))
Guo, Wei (School of Civil Engineering, Central South University)
Publication Information
Wind and Structures / v.30, no.5, 2020 , pp. 533-546 More about this Journal
Abstract
Large Eddy Simulation (LES) is used to study the effects of steady slot suction on the aerodynamic forces of and flow around a wall-mounted finite-length square cylinder. The aspect ratio H/d of the tested cylinder is 5, where H and d are the cylinder height and width, respectively. The Reynolds number based on free-stream oncoming flow velocity U∞ and d is 2.78×104. The suction slot locates near the leading edge of the free end, with a width of 0.025d and a length of 0.9d. The suction coefficient Q (= Us/U∞) is varied as Q = 0, 1 and 3, where Us is the velocity at the entrance of the suction slot. It is found that the free-end steady slot suction can effectively suppress the aerodynamic forces of the model. The maximum reduction of aerodynamic forces occurs at Q = 1, with the time-mean drag, fluctuating drag, and fluctuating lift reduced by 3.75%, 19.08%, 40.91%, respectively. For Q = 3, all aerodynamic forces are still smaller than those for Q = 0 (uncontrolled case), but obviously higher than those for Q = 1. The involved control mechanism is successfully revealed, based on the comparison of the flow around cylinder free end and the near wake for the three tested Q values.
Keywords
aerodynamic forces; finite-length square cylinder; steady suction; flow control; LES;
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