Hydrodynamic mechanism of marine rudder considering the influence of aspect ratio
In order to explore the hydrodynamic mechanism of marine rudders under the influence of different aspect ratios, the viscous CFD technology is adopted to simulate the hydrodynamic performance of marine rudders with different aspect ratios at different rudder angles. Firstly, the grid independence analysis is carried out, and the accuracy of the numerical simulation method is verified based on the experimental results. Then the hydrodynamic mechanism of the rudder is explained according to the surface pressure distribution, velocity flow field distribution and wake vortex shape of the rudder. The research shows that the greater the aspect ratio, the easier it is to cause flow separation, and eventually the stall phenomenon will occur in advance. As the aspect ratio increases, the rudder angle corresponding to the optimal lift-drag ratio will move forward. With the increase of rudder angle, the flow separation point will gradually move forward.