Application of different strategies of partitioned fluid-structure interaction simulation for a single-blade pump impeller

摘要

In this article, the one-way and two-way coupling strategies are used, respectively, for partitioned fluid-structure interaction simulation to numerically investigate the hydrodynamic force and vibration of single-blade pump impeller at design and off-design conditions, and the effect of mesh resolution on the two-way coupling results is also considered. The comparison analysis of the calculated results with different strategies, involving aspects of amplitude and phase, has been carried out. In addition, the simulated impeller deflection results are also compared with experimental results by proximity sensors. The analysis of the results show that for different mesh resolutions, the amplitude of deflection with fine mesh is bigger than that with coarse mesh for almost all the operational conditions, and the phase differences can be clearly found for part-load conditions. The amplitude of hydrodynamic force calculated with coarse mesh is smaller than that is calculated with fine mesh in almost all quadrants for each flow rate, except the first quadrant for Q = 11 L/s. Furthermore, the amplitude of deflection calculated by two-way coupling strategy is bigger than that is calculated by one-way coupling strategy in certain quadrants for each flow rate, and the phase results have a good agreement for different coupling strategies. The amplitude of hydrodynamic force calculated by one-way coupling is just slightly smaller, and the phase difference can only be observed for Q = 42 L/s and Q= 11 L/s conditions.