考虑大变形的大柔性立管涡激振动模型

A new model for predicting vortex-induced vibration of a long flexible riser with large deformation

在总结深海大柔性立管涡激振动研究基础上,提出考虑大变形的大柔性立管涡激振动数学模型,开发出相应的计算程序。在验证新模型计算程序可靠的基础上,分别在雷诺数Re=6300、Re=1.2×105情况下研究深水顶张式立管涡激振动特征。结果表明,低雷诺数时立管涡激振动以低阶单模态振动为主;随雷诺数的增大,立管涡激振动出现多模态参与振动及涡激振动非完全对称大变形现象。考虑大变形的大柔性立管涡激振动数学模型可用于深水、极深水立管系统涡激振动响应分析预测。

Based on previous studies, an new model considering large deformation was proposed here to predict the vortex-induced vibration responses of a deep-water riser. The corresponding MATLAB codes were developed. Based on the new model, the vortex-induced vibration features of a top tension type of deepwater riser were further investigated with Re = 6300 and Re = 1.2×10^5 , respectively. The results showed that with lower Reynolds numbers, a lower order single mode is the main vibration mode; but with increase in Reynolds numbers, multiple modes are involved in the vortexinduced vibrations; besides, large deformation happens; the new model considering large deformation is applicable to predict vortex-induced vibration of a long flexible riser.