Effects of the Surface Roughness on the Characteristics of the Cavitation in a Hydrofoil

수중익의 표면거칠기가 캐비테이션 특성에 미치는 영향

In this study, the characteristics of the cavitation behavior around hydrofoil are investigated with the commercial CFD code CFX-5. Calculations are performed for NACA 64108 hydrofoil by solving the time-averaged turbulent Navier-Stokes equations and discretized by finite volume method. We classify the different cavitating regimes in which appear at the hydrofoil according to the values of cavitation number, surface roughness and angle of attack. Special attention is paid to the following topics: cavity length, void fraction and lift breakdown.