矩形断面涡激振动多模态响应数值研究
Numerical Study on Multi-Modal Response of Vortex-Induced Vibration for Rectangular Cross-Section
摘要: 为研究宽高比5:1柔性矩形断面的涡激振动特性，采用双向流固耦合与大涡模拟方法，对结构多模态振动响应、时空能量分布及尾流涡结构开展数值分析。结果表明，柔性矩形断面涡激振动存在显著多模态竞争特征，振幅沿展向呈波峰波谷交替分布；波峰处能量集中、振动强度高，以2S涡脱为主；波谷处能量分布宽泛、强度低，以2P涡脱为主。随风速提高，主导模态阶数上升，高阶模态振幅降低。研究结论可为桥梁钝体断面抗风设计与涡振机理分析提供参考。
Abstract: To investigate the vortex-induced vibration (VIV) characteristics of a flexible rectangular section with an aspect ratio of 5:1, numerical analyses were conducted on the multi-modal vibration response, spatial-temporal energy distribution, and wake vortex structure of the structure using the bidirectional fluid-structure interaction (FSI) and large eddy simulation (LES) methods. The results show that the VIV of the flexible rectangular section exhibits significant multi-modal competition characteristics, and the amplitude presents an alternating distribution of peaks and troughs along the spanwise direction. At the amplitude peaks, the energy is concentrated with high vibration intensity, dominated by the 2S vortex shedding mode. At the amplitude troughs, the energy is widely distributed with low vibration intensity, dominated by the 2P vortex shedding mode. With the increase of wind speed, the order of the dominant mode rises, and the amplitude of higher-order modes decreases. The conclusions can provide a reference for the wind-resistant design and VIV mechanism analysis of bridge bluff sections.
文章引用：董国朝, 王煜州. 矩形断面涡激振动多模态响应数值研究[J]. 流体动力学, 2026, 14(2): 128-138. https://doi.org/10.12677/ijfd.2026.142012

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