Wind and Structures

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Unsteady aerodynamic force on a transverse inclined slender prism using forced vibration

  • Zengshun Chen (School of Civil Engineering, Chongqing University) ;
  • Jie Bai (China State Construction Silk Road Investment Group Co., Ltd.) ;
  • Yemeng Xu (School of Civil Engineering, Chongqing University) ;
  • Sijia Li (School of Civil Engineering, Chongqing University) ;
  • Jianmin Hua (School of Civil Engineering, Chongqing University) ;
  • Cruz Y. Li (Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology) ;
  • Xuanyi Xue (School of Civil Engineering, Chongqing University)
  • Received : 2022.05.23
  • Accepted : 2023.10.18
  • Published : 2023.11.25
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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 Kármán 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 Bérnard-Kármán 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.

Keywords

Acknowledgement

The authors appreciate the testing facility, as well as the technical assistance provided by the CLP Power Wind/Wave Tunnel Facility at the Hong Kong University of Science and Technology. The authors also thank the Design and Manufacturing Services Facility (Electrical and Mechanical Fabrication Unit) of the Hong Kong University of Science and Technology for their help in manufacturing the test rig of the forced vibration wind tunnel test system.

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