海洋立管涡激振动属于典型的流固耦合问题，涡激振动在横流及顺流方向上会同时发生并存在耦合效应。在以往的相关研究中，常忽略顺流向振动或将横流及顺流向振动响应间相互作用进行弱化。本文以顶张式立管为研究对象，基于圆柱体双自由度受迫振动试验数据，使用有限元方法和能量平衡方程建立涡激振动频域预报模型。该数值模型能够同时得到立管在横流及顺流方向涡激振动响应特性。通过与均匀流、阶梯流和剪切流3种不同类型来流工况下顶张式立管自激振动实验数据进行对比，验证了数值模型的有效性。该预报方法可为深入理解海洋立管涡激振动问题提供一定的参考。
Vortex-induced vibration of marine riser is a typical fluid-solid coupling problem and has been widely concerned by ocean engineering. The vortex-induced vibration, which has coupling effect, will occur simultaneously in the direction of cross-flow and in-line. In previous studies, the in-line vibration was often ignored or the interaction between cross-flow and in-line vibrations were weakened. In this paper, the top-tensioned riser is taken as the research object, based on the experimental data of forced vibration of cylinder with two degrees of freedom, the frequency domain prediction model of vortex induced vibration is established by using the finite element method and the energy balance equation. The model can predict the vibration response characteristics in both directions of the riser. The numerical model is validated by comparing with the experimental data of riser self-excited vibration under three different current conditions: uniform flow, stepped flow and shear flow. The numerical prediction method can provide some reference for further understanding of the vortex-induced vibration of marine riser.
2022,44(3): 75-81 收稿日期：2020-12-22
DOI：10.3404/j.issn.1672-7649.2022.03.015
分类号：U661.1
基金项目：国家自然科学基金资助项目(51909163，51979166)
作者简介：李宇坤(1996-)，男，硕士研究生，主要研究方向为涡激振动
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