1-14 Trajectory of bubbles under a ship hull and scale effects

抄録

For energy conservation reasons, viscous drag reduction is of great interest for full scale ships. A lot of references report skin friction or total drag reduction when bubbles are injected into the boundary layer on the hull. As experiments on a full scale ship are almost impossible and in order to understand how experimental results can be applied to full scale ships, the influence of the hull size on the trajectory of bubbles injected on the bottom of geosim ship hulls was investigated. After a description of the experimental work, the numerical scheme used to compute the bubble trajectories is explained. Then the experimental and numerical results are presented and discussed. The influence of the scale effect and of the injection location is shown.