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Wind and Structures
  Volume 30, Number 5, May 2020, pages 533-546
DOI: 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
Hanfeng Wang, Lingwei Zeng, Md. Mahbub Alam and Wei Guo

 
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 Us/U∞) is 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.
 
Key Words
    
 
Address
Hanfeng Wang : School of Civil Engineering, Central South University, Changsha, China/
National Engineering Laboratory for High-speed Railway Construction, Central South University, Changsha, China
Lingwei Zeng: School of Civil Engineering, Central South University, Changsha, China
Md. Mahbub Alam : Institute for Turbulence-Noise-Vibration Interaction and Control, Harbin Institute of Technology (Shenzhen), Shenzhen, China
Wei Guo: School of Civil Engineering, Central South University, Changsha, China/National Engineering Laboratory for High-speed Railway Construction, Central South University, Changsha, China
 

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