Effect of cavitation on vortex-induced vibration of hydrofoil

The numerical investigation focuses on the vortex shedding behavior of hydrofoils under the simultaneous occurrence of cavitation and lock-in. To assess the influence of cavitation on vortex-induced vibration in a two-dimensional hydrofoil with a blunt trailing edge, simulations are conducted at 0° and 4° angles of attack. The accuracy of the numerical simulation method is validated through a comparison with experimental cavitation data on the hydrofoil. The results indicate that as the cavitation number decreases, the frequency of the vortex shedding increases, and the vibration amplitude decreases. As cavitation occurs, the vortex shape transitions from circular to elongated ellipsoidal, with an accompanying increase in both strength and volume. At an angle of attack of 0°, the frequency range of the lock-in-state of the hydrofoil is reduced. At an angle of attack of 4°, both sheet cavitation and vortex cavitation manifest during the whole stage of vortex shedding in lock-in and the unstable stage of vortex shedding in non-lock-in.