Coupling shape and load distribution characteristics of underwater explosion multi-bubble
Compared with single bubble,there are significant differences in the shape evolution and fluctuating load distribution of bubbles produced by underwater explosion with multiple sources.Based on supercomputer workstation and Ls-dyna finite element software,a three-dimensional model of three-bubble and four-bubble horizontal array with the center distance of explosion source in free field being a bubble maximum radius R is established,the evolution process of multi-bubble fusion and the spatial load distribution of multi-bubble fusion are analyzed by ALE algorithm.The results show that the jet flow occurs at both ends of the bubble after multi-bubble fusion,and the local collapse discordance of the bubble causes the collapse load above the three-bubble fusion bubble to be larger than that above the four-bubble fusion bubble,however,the total impulse of three-bubble fusion is always less than that of four-bubble fusion.Compared with a single bubble,the pulsation period of multiple bubbles increases,and the ratios of the first pulsation period of the three-bubble and four-bubble to the single bubble are 137%and 147%,respectively.The load of multiple bubbles is significantly enhanced,and the ratios of the pulsation load peak value at a distance of R above the center of the three-bubble and four-bubble to that of the pulsation load peak value at the same position of the single bubble are 400%and 263%,respectively.
underwater explosionfusing bubblesbubble pulsationload distribution characteristicsnumerical simulation
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