Effects of upstream corner cut on aerodynamic performance of two tandem square cylinders

ZHENG Deqian, ZHU Yuzhe, LIU Shuaiyong, MA Wenyong, FANG Pingzhi4

Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (15) : 216-223.

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (15) : 216-223.

Effects of upstream corner cut on aerodynamic performance of two tandem square cylinders

  • ZHENG Deqian1, ZHU Yuzhe1, LIU Shuaiyong2, MA Wenyong3, FANG Pingzhi4
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Abstract

There is a close relationship between aerodynamic interference effect of two tandem square cylinders and characteristics of flow around square cylinder. The local shape change of corner of square cylinder can significantly affect aerodynamic interference effect of two square columns in series. Until now, the related studies are very few. Here, the 2-D unsteady  numerical simulation method based on Reynolds average SST k-ω turbulence model was adopted to study effects of no corner cut and corner cut (10%) on aerodynamic performance of the two tandem square cylinders. Comparing the numerical simulation results under conditions of no corner cut and the spacing ratio of 2.0 with test results in literature verified the effectiveness of the simulation method and parameter setting. Then, according to the contrastive analysis of lift and drag coefficients, critical spacing ratios of the two square columns in series without and with corner cut in upstream were determined to be 4.6 and 4.1, respectively. Finally, the 3-D unsteady flow around the two cylinders without and with corner cut was simulated using the spatially averaged large eddy simulation
to analyze effects of upstream corner cutting on aerodynamic performance of the two cylinder in detail from the angle of wind pressure distribution. The mechanism analysis was performed in the aspect of time averaged  and transient flow fields around the two cylinders. It was shown that after corner cutting of the upstream square cylinder, the flow separates and reattaches in, wake flow becomes narrow, and vortex shedding becomes more complex to cause flow field’s  state varying, wind pressure distribution being affected, square cylinder’s lift and drag coefficients dropping, and critical spacing being shortened.

Key words

two tandem square cylinders / corner cutting / numerical simulation / critical spacing / aerodynamic performance / flow field mechanism

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ZHENG Deqian, ZHU Yuzhe, LIU Shuaiyong, MA Wenyong, FANG Pingzhi4. Effects of upstream corner cut on aerodynamic performance of two tandem square cylinders[J]. Journal of Vibration and Shock, 2021, 40(15): 216-223

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