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.

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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