Abstract
The growth and collapse of a bubble under a floating body are studied using the boundary element method. The toroidal bubble dynamics and the translation of floating bodies are taken into consideration. It is shown that when the mass of a floating body is sufficiently heavy, the bubble behavior is similar to that near rigid boundaries : the bubble translates toward the floating body, and the liquid jet threads the bubble surface in the final stage of the collapse. On the other hand, when the mass is moderate, the bubble collapses at the initial position without translation. The heavier the mass of a floating body becomes, the larger the bubble translation toward the body becomes, and thus the higher pressure is induced at the bottom of the body due to the impact of liquid jet. The results also show that the analysis with Kelvin impulse is effective in evaluating the bubble translation under floating bodies.
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