“学萃讲坛”第583期--Transient Cavitating Vortical Flow Structure and Excited Pressure Fluctuation around Hydrofoils and Marine Propellers by CFD Analysis
报告题目：Transient Cavitating Vortical Flow Structure and Excited Pressure Fluctuation around Hydrofoils and Marine Propellers by CFD Analysis
报告人：Ji Bin（Wuhan University）
Dr. Bin JI, associate professor of School of Power and Mechanical Engineering, Wuhan University. His research mainly forced on the mechanism of cavitation and its application in fluid machinery. His work revealed the mechanism of cavitation-vortex interaction with a vorticity transport equation and cavitation excited pressure fluctuations.
Due to his contribution to the understanding of hydrodynamic cavitation, his paper was awarded the first highly cited paper prize by the Journal of Hydrodynamics in 2015 and 100 most influential international academic papers of China in 2016.
Cavitation phenomena consist of a complex combination of fluid dynamics and bubble/cavity mechanics. The unsteadiness of cavitation can therefore significantly induce pulsation in the hydrodynamic performance and pressure fluctuations. In order to gain a better understanding of the complex physics involved, unsteady cavitating flow simulation around hydrofoils and marine propellers were carried out by CFD analysis. 3D hydrofoil was selected to study 3D cavitating flow structures for some operating conditions. We also studied unsteady cavitating flows around marine propellers in non-uniform wake. The results described in both cases were intended to shed light on the physical processes responsible for the pressure fluctuation excited by the cavitation evolution (lower frequency component only). The cavitation evolution, especially cavity volume, was related to the pressure fluctuations. The results show that the acceleration due to the cavity volume change is the main source of the pressure fluctuations. The simulation agrees well with preliminary experimental results.