Large eddy simulation for small spacing ratio tandem two square cylinders with upstream column corner cutting and chamfering
ZHENG Deqian1, ZHU Yuzhe1, MA Wenyong2, FANG Pingzhi3，LI Yuxue2
1.School of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China;
2.School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;
3.Shanghai Typhoon Institute, China Meteorological Administration, Shanghai 200030, China
Abstract：There exists shielding effect between two tandem square cylinders when the spacing ratio is small, while variation of the shielding effect by corner shape modification of the upstream square cylinder needs to be further investigated. In this study, unsteady flow around two tandem square cylinders at spacing ratio (defined by the ratio of the central distance and the depth of the cylinders) of 2.0 was numerically simulated by the spatial averaged large eddy simulation technique. Three tandem square cylinder cases were investigated, considering corner cutting and recession (with the correction rate of 10%) of the upstream square cylinder and that without corner modification, respectively. The inflow is uniform without turbulence and the Reynolds number is set to be 22000, defined by the incoming mean wind velocity and the depth of the cylinder. The present numerical method and parameter setting was verified by comparing the results between the present simulation and previous studies for the tandem square cylinders without corner modification. The influence of corner cutting and recession was discussed by comparing the simulated mean and fluctuating aerodynamic coefficients and wind pressure distribution of the three cases. The power spectrum is analyzed and compared with each other for monitoring points around the upstream and downstream cylinders. The flow mechanism was also discussed by analyzing the time-averaged and transient flow fields around the cylinders. The results indicates that the corner cutting and recession on the upstream square cylinder changes the position of the flow separation point, reduces the diffusion angle of the separation shear layer and makes the separation vortex closer to the wall. Flow reattachment on the downstream square cylinder is thus affected, resulting in decreases of the mean and fluctuating wind load. The corner cutting on the upstream square cylinder can remarkably reduce mean wind load in the streamwise direction, while the corner recession treatment can weaken the transversal fluctuating wind load.
郑德乾1，祝瑜哲1，马文勇2，方平治3，李玉学2. 上游切角倒角小间距比串列方柱大涡模拟研究[J]. 振动与冲击, 2022, 41(7): 37-45.
ZHENG Deqian1, ZHU Yuzhe1, MA Wenyong2, FANG Pingzhi3，LI Yuxue2. Large eddy simulation for small spacing ratio tandem two square cylinders with upstream column corner cutting and chamfering. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(7): 37-45.
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