Vortex-induced vibrations (VIVs) of a small-scale subsea jumper has been studied numerically using a wake oscillator model. The dynamics of the jumper is described based on the linear Euler–Bernoulli beam theory and a wake oscillator model is uniformly distributed along the jumper to model the hydrodynamic force acting on it. The dynamics of the coupled system has been solved using the finite element method and the responses of the jumper subjected to uniform flows in different directions have been analysed. Some important characteristics of jumper VIVs, such as multi-frequency multi-mode response, single-frequency multi-mode response as well as uncoupled cross-flow and in-line VIVs without dual resonance, have been identified and the underlying mechanism have been explored. One unique character of the jumper mode is that some segmental elements of the jumper would undertake significant rigid body motions in their axial directions. A qualitative comparison shows that these axial rigid body motions of the segmental elements may influence the hydrodynamic force and could play an important role in the reliable prediction of the jumper VIV.

已经使用尾流振荡器模型对小型海底跳线的涡激振动 (VIV) 进行了数值研究。跳线的动力学是基于线性欧拉-伯努利梁理论描述的，尾流振荡器模型沿跳线均匀分布，以模拟作用在其上的流体动力。耦合系统的动力学已经使用有限元方法求解，并且跨接器在不同方向的均匀流动下的响应已经被分析。已经确定了跳线 VIV 的一些重要特性，例如多频多模响应、单频多模响应以及非耦合横流和无双谐振的直列 VIV，并探索了其潜在机制. 跳线模式的一个独特特征是跳线的某些分段元件会在其轴向方向上进行显着的刚体运动。定性比较表明，这些分段元件的轴向刚体运动可能会影响流体动力，并且可以在可靠预测跳线 VIV 中发挥重要作用。