Abstract:Due to remarkable effects of chamfering and corner cut measures on aerodynamic force and flow field of a square cylinder, the two measures are commonly taken as means of flow control of square cylinder. Here, the large eddy simulation method was adopted to study aerodynamic performance and flow field of a standard square cylinder, and other two ones with chamfering and corner cut, respectively under the condition of uniform flow field considering Reynolds number for three square cylinders of 22 000, and effects of the two measures with angle change ratio of 10%. Firstly, the large eddy simulation results of the standard square cylinder were compared with the test and numerical simulation ones in relevant literatures to verify the correctness of the proposed method and parameter values chosen here. Then, the effects of chamfering and corner cut measures on wind pressure distribution and aerodynamic force of square cylinder were analyzed. The influence mechanism of corner treatment measures on aerodynamic performance of square cylinder was emphatically analyzed from the points of view of time averaged flow field and transient flow one. Results showed that chamfering and corner cut measures have certain effects on wind pressure distribution and aerodynamic force of square cylinder surface, especially, their effects on wind pressure coefficient of flow separation zone on square cylinder surface are more significant; after taking corner treatment measures, the flow separation in the corner area of square cylinder’s front edge is affected, the diffusion angle of the separation shear layer is smaller, and the separation vortex on the side is closer to the wall surface to form reattachment on the side of square cylinder, tail flow is narrower, vortex shedding frequency components are more complex, average drag coefficient is smaller, aerodynamic force fluctuation intensity is weaker, vortex shedding frequencies are higher and intensity is weaker.
郑德乾1,刘帅永1,马文勇2,陈华为3. 倒角切角对方柱气动性能影响的大涡模拟研究[J]. 振动与冲击, 2021, 40(1): 8-14.
ZHENG Deqian1, LIU Shuaiyong1, MA Wenyong2, CHEN Huawei3. Large eddy simulation for effects of chamfering and corner cut on aerodynamic performance of square cylinder. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(1): 8-14.
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