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.
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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