金属材料与复合材料海洋立管的三维CFD涡激振动模拟

3D simulation of vortex-induced vibration for steel and composite risers

研究了流固耦合作用下,传统金属海洋立管与复合材料海洋立管的涡激振动特性,并对比了雷诺数Re=7 500时,两种海洋立管的动力响应.利用ANSYS-Transient模块,采用等效模量法构建两种海洋立管模型;利用Fluent模块建立流体场模型,并通过system-coupling模块实现立管和流体场的流固耦合作用.由于两种海洋立管的外径、支撑条件、雷诺数等相同,所以它们的尾涡云图,速度矢量图及升阻力系数特性基本相同.但由于两种海洋立管的材料属性,顶张力等不同,它们的动力特性明显不同.相同流场条件下,复合材料海洋立管具有更大的变形及更小的应力响应.

The Vortex-induced vibration（VIV）features of steel and composite risers are investigated with fluid to structure interaction（FSI）and their dynamic responses are compared with Re=7 500.ANSYS-Transient and Fluent are utilized to model the risers and flow field,respectively.The FSI is achieved by system-coupling.The trailing vortex,velocity vector and CLCDof the two types of risers are quite similar,for their outside diameters,support conditions and Re are the same.However,as their material properties and top-tension force are different,their dynamic responses are different.In the same flow field,composite riser has larger displacement and smaller stress.