Cavitation assessment on a model scale tidal turbine

In this paper the inception of cavitation occurrence on a model scale tidal turbine is evaluated by means of numerical simulations. Cavitation is assessed implementing the Singhal et al. model, based on the use of the Rayleigh-Plesset equation for bubble dynamics description. For this purpose, Reynolds Averaged Navier Stokes (RANS) simulations are carried out. Results are evaluated after a validation campaign of the cavitation model was conducted on a NACA 66 (mod) hydrofoil profile. The experimental pressure coefficients evaluated on the NACA 66 (mod) suction side are compared with those computed from time averaged computational fluid dynamics (CFD) solutions. The model scale tidal turbine domain is then validated comparing the experimental and the computational power and thrust coefficients. The cavitating risk is finally highlighted by showing vapour entities formation when the inflow and the rotating velocities are sensible increased.