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

Hanfeng Wang , Lingwei Zeng , Md. Mahbub Alam , 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.

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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