Influence of transverse vibration induced by fluid-structure interaction on pipeline strength

The transverse vibration of a pipe induced by fluid–structure interaction can cause abnormal fluctuation, buckling and flutter. In this paper, the effect of fluid–structure interaction on the transverse vibration of nuclear power pipelines is analyzed theoretically and numerically. Firstly, a theoretical model of the nuclear power pipe and the fluid that flows internally is established based on Hamilton’s principle. Then, an analytical solution of the transverse vibration differential equation considering the fluid–structure interaction is obtained. Next, a finite element analysis of the transverse vibration of nuclear power pipe due to fluid–structure interaction is carried out. In the end, the analytical solutions of natural frequency, vibration performance, mechanics characteristic of pipes are compared with the finite element solution. The results show that the analytical solutions of transverse vibration of pipes are consistent with the finite element solutions. In addition, the results show that the negative effect of transverse vibration due to fluid–structure interaction on the pipe strength is worthy of attention only at a high internal pressure or velocity. It is of great significance to improve the safety and economic benefits of fluid-filled pipes.