In this paper, vortex-induced vibrations (VIV) of deepwater risers including the VIV-induced tension fluctuations were simulated using a time domain VIV model. Data from a large-scale riser experiment was applied for correlation studies. As a first step, a new combination of in-line and cross-flow synchronization models with empirical parameters was proposed for better in-line response prediction. The performance of the improved load model was investigated based on a linear riser model. The results showed that the in-line response and its synchronization pattern were improved compared to the previous load model. Then, the improved load model was combined with a non-linear structural riser model to explore the effect of tension fluctuations. As observed in the tests, simulations showed that the tension fluctuations influenced the stability of VIV and possibly decreased the resulting vibration amplitudes. Lastly, the VIV prediction performance of the load model was evaluated with respect to frequency contents, stress levels, and fatigue damage. From the results, it was found that the improved load model in combination with the non-linear structural model reflected the response characteristics observed in the tests.

在本文中，使用时域 VIV 模型模拟了深水立管的涡激振动 (VIV)，包括 VIV 引起的张力波动。来自大规模立管实验的数据用于相关性研究。作为第一步，提出了具有经验参数的在线和交叉流同步模型的新组合，以更好地预测在线响应。基于线性立管模型研究了改进的负载模型的性能。结果表明，与之前的负载模型相比，在线响应及其同步模式得到了改进。然后，将改进的载荷模型与非线性结构立管模型相结合，探索张力波动的影响。正如在测试中观察到的那样，模拟表明，张力波动会影响 VIV 的稳定性，并可能降低由此产生的振动幅度。最后，根据频率内容、应力水平和疲劳损伤评估载荷模型的 VIV 预测性能。从结果可以看出，改进的荷载模型结合非线性结构模型反映了试验中观察到的响应特性。