An 1D-3D coupling method for flow-induced vibration of pump-valve-pipe system

The flow-induced vibration (FIV) in ship pump-valve-pipe system is characterized by significant coupling effects between components. However, due to the presence of multiple excitation sources and cross-scale mesh challenges, traditional FIV calculation methods prove inadequate for system-level simulation. To overcome this limitation, a system-level FIV simulation interface program was developed in this study. Using a partitioned excitation extraction approach, the FIV loads for the system were calculated and applied to the structural dynamics model. Ultimately, a computational method for system-level FIV simulation based on a 1D-3D coupling algorithm was developed. To validate the accuracy, an experiment was conducted. The results demonstrate that this methodology significantly improves the computational efficiency of system-level flow-induced vibration simulations while maintaining satisfactory accuracy. Furthermore, the FIV of system during the valve closing process is simulated, and the transient vibration characteristics were investigated. Additionally, the influence of valve closing time and mode on the flow field and vibration characteristics of the pump was investigated. The pump head exhibits an oscillating increase during the valve closing process, while the vibration in the impeller’s radial direction intensifies with decreasing flow rate.