| 高洋洋，杜枋树，王立忠.均匀流及剪切流下柔性立管涡激振动数值研究[J].海洋工程,2026,(1):1~15 |
| 均匀流及剪切流下柔性立管涡激振动数值研究 |
| Numerical study on the vortex-induced vibrations of flexible risers under uniform and shear flows |
| 投稿时间：2024-10-19 修订日期：2024-12-26 |
| DOI：10.16483/j.issn.1005-9865.2026.01.001 |
| 中文关键词: 涡激振动 模态转移 柔性立管 流固耦合 振动功率谱 |
| 英文关键词:vortex-induced vibration mode transition flexible riser fluid-structure interaction vibration power spectrum |
| 基金项目:国家自然科学基金面上项目（52371291）；浙江省尖兵领雁研发攻关计划项目（2023C01008）；三亚崖州湾科技城管理局重点项目（SKJC-2020-01-016） |
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| 中文摘要: |
| 基于计算流体力学软件ANSYS中的Fluent模块和Transient Structural模块建立耦合模型，采用双向流固耦合的方法对不同均匀流及剪切流速下的柔性立管涡激振动进行数值模拟研究，并与现有文献结果进行对比。分析流速对立管振幅响应、振动包络线、模态转移过程以及振动功率谱的影响，探讨多模态现象及其产生机理，并对两种流态下立管的振幅和模态进行对比。研究结果表明：在两种流态下，立管横流向振动模态数随着流速的增大逐渐向更高阶过渡，均匀流下横流向振动最高可达4阶，并且在模态过渡过程中会出现多模态共同参与的现象，剪切流下横流向振动最高可达3阶，且各工况始终保持稳定的驻波特性。立管在均匀流条件下振动过程中，当主导模态发生改变时，振幅值和振幅均方根值都会出现大幅度的变化，在主导模态转移的过程中，振动频率有明显的多频参与现象。流速为0.1和0.2 m/s时，均匀流与剪切流下的最大振幅值相对接近；随着流速增大到0.3 m/s时，均匀流下的最大振幅值要稍大于剪切流；当流速为0.4 和0.5 m/s时，剪切流下的最大振幅值远大于均匀流。 |
| 英文摘要: |
| Based on the Fluent and Transient Structural modules in the computational fluid dynamics software ANSYS, a coupled model was established. A numerical simulation study on the vortex-induced vibration (VIV) of a flexible riser under different uniform and shear flow velocities was conducted using the two-way fluid-structure interaction (FSI) method, and the results were compared with existing literature. The effects of current velocity on the riser's amplitude response, vibration envelope, mode transition process, and vibration power spectrum were analyzed, with particular attention to multi-modal phenomena and their underlying mechanisms. Additionally, the amplitude and mode of the riser were compared under the two flow regimes. The results indicate that the number of cross-flow vibration modes of the riser gradually transitions to higher orders as the current velocity increases in both flow regimes. Under uniform flow, cross-flow vibration can reach the 4th order, with multi-modal co-participation observed during the modal transition process. Under shear flow, cross-flow vibration can reach the 3rd order, consistently maintaining a stable standing-wave characteristic. During riser vibration in uniform flow, significant changes in amplitude and RMS values occur when the dominant mode shifts, accompanied by a clear multi-frequency participation phenomenon. At current velocities of 0.1 m/s and 0.2 m/s, the maximum amplitudes in uniform and shear flows are relatively close. As the velocity increases to 0.3 m/s, the maximum amplitude in uniform flow becomes slightly greater than in shear flow. However, at current velocities of 0.4 m/s and 0.5 m/s, the maximum amplitude in shear flow greatly exceeds that in uniform flow. |
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