The complex aerodynamic admittance functions of rectangular cylinder in controllable fluctuating wind fields

被引：0
|
作者：
Li W. [1 ]
Niu H. [1 ]
Hua X. [1 ]
Chen Z. [1 ]
机构：
[1] Key Laboratory for Wind and Bridge Engineering of Hunan Province, Hunan University, Changsha
来源：
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | 2022年 / 35卷 / 04期
关键词：
Buffeting; CFD; Complex aerodynamic admittance; Harmonic fluctuating wind; Rectangular cylinder; Super‑long bridge;
D O I：
10.16385/j.cnki.issn.1004-4523.2022.04.025
中图分类号：
学科分类号：
摘要：
In order to study the effects of pulsing wind parameters and structural motion state on the complex aerodynamic admittance functions (AAF) of bluff body, a new procedure to generate the vertical- and along-wind harmonic inflows in CFD simulations is proposed. Based on the N-S equation and the boundary condition, this method can well control the amplitude and generate multi-frequency harmonic inflows. The lift and drag AAFs of a rectangular section with aspect ratio of 4 are identified under different wind attack angles and three different harmonic amplitudes. The aerodynamic admittances are compared under the multi-frequency harmonic combinations as well as the vertical and torsional motions. It is shown that the lift admittance at null attack angle is in good agreement with the experimental data. The wind angle attack and harmonic amplitude have a significant impact on the complex admittance. In addition, the lift AAFs remain almost the same in multi-frequency inflows and different motions, while the torsional motion can increase the value of drag AAF at high frequencies. © 2022, Editorial Board of Journal of Vibration Engineering. All right reserved.
引用
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页码：1010 / 1019
页数：9
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