中文摘要：

海洋立管受到一定速度的海流冲击时,立管周围区域会发生圆柱绕流和涡激振动现象,对立管安全造成严重损害。从圆柱绕流出发,对亚临界雷诺数下的深水立管的圆柱绕流进行了二维数值模拟,对圆柱绕流阻力系数和升力系数等特性参数进行了考察,在此基础上进行了含有附加杆的立管绕流的模拟分析,证明了附加杆抑制立管圆柱绕流的突出作用。研究结果可为研制带有附属杆的海洋立管提供一定参考。

英文摘要：

When the ocean riser is subjected to current of a certain velocity,flow around cylinder and vortex-induced vibration occur around the riser,causing serious damage to the safety of the riser.Two-dimensional numerical simulation of the flow around cylinder of the riser under subcritical Reynolds number is carried out.The parameters such as the resistance coefficient and the lift coefficient of the cylinder are investigated.Especially,the flow around a riser with an additional pipe is simulated,and the simulation results show that the additional pipe can help to suppress the flow around cylinder.This research has a certain reference value for the development of the offshore riser with additional pipes.