PREDICTION OF RUDDER CAVITATION CONSIDERING PROPELLER AND HULL EFFECTS

摘要

Nowadays, ship owners make high demands to the durability of a rudder as well as propeller blades against cavitation erosion, because the complex inflow induced by the propeller often causes cavitation on the rudder surface. However, it is very difficult to analyze the cavitating flow around a rudder with the complicated propeller-rudder interaction. This paper presents a boundary element method for the prediction of rudder cavitation characteristics by the velocity field formulation for potential flow. To evaluate the spanwise loading distribution, the kinematic boundary condition is applied to additional panels, named Kutta panels and linear vortex wake model is used. To validate the numerical method, the pressure distributions and the cavity shapes on the rudder are compared with the experiments.