深海柔性立管涡激振动是海洋工程领域的热点问题，多立管间的振动干涉现象备受关注。本文采用CFD(Computational fluid dynamics)技术，开展了低雷诺数条件下不同剪切流速和轴间距，对串列弹性双管涡激振动干涉影响的仿真计算研究。计算结果表明，轴间距对上、下游管体的顺流向运动响应的影响各异，对上游管体的主振模态影响略小，对下游管体的主振模态影响较大。基于串列双管体的频域振动响应分析，发现上、下游管体的涡激振动在不同轴间距下均呈现“多频共存”现象。通过结构的瞬态时域振动能量分析，发现上、下游管体均存在“同相”和“反相”振动过程，同时阐明了弹性管体多模态振动特性和相邻阶振动模态转换的规律，以及沿细长弹性管体传播的行波和驻波特性。
关键词：涡激振动；串列；轴间距；振动干涉
Abstract
Vortex-induced vibration related to deep-sea flexible pipes is a hot issue in the field of ocean engineering, and the phenomena of vibration interference among multiple pipes are attracted much attention. In this paper, the simulation study about the influence of different shear flow velocities and axial spacings on the interference of the vortex-induced vibration of the tandem flexible dual pipes in the case of low Reynolds number, was carried out via CFD package. The calculation results show that the axial spacing affects the motion responses of upstream and downstream pipes differently, in the form of having slight influence on the dominant vibration mode of the upstream pipe and having larger influence on the dominant vibration mode of the downstream pipe, respectively. Through the frequency domain analysis, it is found that the phenomenon of “multi-frequency coexistence” is favorable in the vibration processes related to upstream and downstream pipes in the case of various axial spacings. Through the transient time-domain analysis, it is found that the phenomena of “in-phase” and “anti-phase” are popular along either upstream pipe or downstream pipe. The multi-modal vibration characteristics and the law of modal conversion among adjacent vibration modes, as well as the characteristics of traveling waves and standing waves propagating along the slender flexible pipes are interpreted.
Key words: Vortex-induced vibration; tandem; axis spacing; vibration interference
关键词
涡激振动 /
串列 /
轴间距 /
振动干涉
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Key words
Vortex-induced vibration /
tandem /
axis spacing /
vibration interference
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