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Wind and Structures Volume 37, Number 5, November 2023 , pages 331-346 DOI: https://doi.org/10.12989/was.2023.37.5.331 |
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Unsteady aerodynamic force on a transverse inclined slender prism using forced vibration |
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Zengshun Chen, Jie Bai, Yemeng Xu, Sijia Li, Jianmin Hua, Cruz Y. Li and Xuanyi Xue
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| Abstract | ||
| This work investigates the effects of transverse inclination on an aeroelastic prism through forced-vibration wind tunnel experiments. The aerodynamic characteristics are tri-parametrically evaluated under different wind speeds, inclination angles, and oscillation amplitudes. Results show that transverse inclination fundamentally changes the wake phenomenology by impinging the fix-end horseshoe vortex and breaking the separation symmetry. The aftermath is a bi-polar, one-and-for-all change in the aerodynamics near the prism base. The suppression of the horseshoe vortex unleashes the Karman vortex, which significantly increases the unsteady crosswind force. After the initial morphology switch, the aerodynamics become independent of inclination angle and oscillation amplitude and depend solely on wind speed. The structure's upper portion does not feel the effect, so this phenomenon is called Base Intensification. The phenomenon only projects notable impacts on the low-speed and VIV regime and is indifferent in the high-speed. In practice, Base Intensification will disrupt the pedestrian-level wind environment from the unleashed Bernard-Karman vortex shedding. Moreover, it increases the aerodynamic load at a structure base by as much as 4.3 times. Since fix-end stiffness prevents elastic dissipation, the load translates to massive stress, making detection trickier and failures, if they are to occur, extreme, and without any warnings. | ||
| Key Words | ||
| aerodynamic damping; forced-vibration; horseshoe vortex; transverse inclination; unsteady aerodynamic force; vortex shedding; wind tunnel experiment | ||
| Address | ||
| Zengshun Chen,Yemeng Xu, Sijia Li, Jianmin Hua, and Xuanyi Xue:School of Civil Engineering, Chongqing University, Chongqing 400045, China Jie Bai:China State Construction Silk Road Investment Group Co., Ltd., Xian, People's Republic of China Cruz Y. Li:Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China | ||