In the construction of a new power system with a high proportion of new energy

the cavitation characteristics of guide vanes and blades in hydropower units

especially pumped storage units under switch condition are quite different from stable condition

and the cavitation development mechanism is worthy of further study. This study examines the flows around a hydrofoil that oscillates in two different modes based on filter correction (FBM) and a Zwart-Gerber-Belamri cavitation model

focusing on the characteristics of flow cavitating evolution and the influences of different modes on the dynamic characteristics of cavitation. The numerical results of the cavitation shapes and velocity vectors around a NACA0015 foil are analyzed

the influencing mechanism of cavity evolution and the hydrodynamic parameters of its oscillating motions are explored. The results show that in the head fixed mode

foil oscillation induces larger cavities and a higher time-average volume fraction of vapor phase than the tail fixed oscillation

and the volume is larger. Under sheet cavitation in the two modes

the overall volume curves of vapor phase are very similar

while they are significantly different under cloud cavitation that differs in form.