Numerical study on effects of corner chamfers on the aero dynamic characteristics and flow field of a square cylinder

Hongmiao Jing , Pengcheng Xu , Peng Guo , Shuaichao Cui , Yinping MA , Yunfei Zheng , Yi Su , Xiongwei Yang , Qingkuan Liu

Abstract

The three-dimensional Large Eddy Simulation (LES) method is conducted to investigate the flow characteristics around the square cylinder under a Reynolds number of Re = 2000. The considered corner chamfered ratio C/D ranges from 0% to 50% with an interval of 5%, where C is the chamfered corner dimension and D is the cylinder width. The focus is given on how C/D influences the flow structure, wake recirculation region, flow separation bubbles, Strouhal number and aerodynamic forces of the cylinder. The numerical results indicate that with increasing C/D, the mean drag coefficient, fluctuating lift coefficient, mean pressure coefficient and fluctuating pressure coefficient decrease. Concurrently, the Strouhal number exhibits an initial increase followed by a decrease with a rise in C/D. Significant changes in the recirculation length and wake width are observed within 0%≤C/D≤50%. The introduction of corner chamfers induces wall-attached evolution of the separated shear layers and suppresses three-dimensional instabilities, significantly attenuating the pressure fluctuating on the surfaces, thereby reducing both mean drag and fluctuating lift coefficients. As the chamfered ratio increases, the wake topology undergoes a transition from disordered fragmented structures to spanwise highly coherent periodic vortices, leading to a narrowband spectral transformation of the power spectra density. Finally, the mathematical relationships between the corner chamfered ratio and the aerodynamic force coefficients and Strouhal number are established.

Key Words

Aerodynamic characteristics; Chamfered corner; Flow fields; Large eddy simulation; Square cylinder

Address

Hongmiao Jing — 1)School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China 2)State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, China 3)Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province, Shijiazhuang 050043, China
Pengcheng Xu — School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
Peng Guo — China Railway Construction Bridge Engineering Bureau Group Co., LTD., Tianjin 300300, China
Shuaichao Cui — China Railway Construction Bridge Engineering Bureau Group Co., LTD., Tianjin 300300, China
Yinping MA — School of Civil Engineering, Chongqing University, Chongqing 400045, China
Yunfei Zheng — Department of Railway Engineering, Shijiazhuang Institute of Railway Technology, Shijiazhuang, 050041, China
Yi Su — School of Civil Engineering, Chongqing University, Chongqing 400045, China
Xiongwei Yang — School of Urban Geology and Engineering, Hebei GEO University, Shijiazhuang 050031, China
Qingkuan Liu — 1)School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China 2)State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, China 3)Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province, Shijiazhuang 050043, China

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