Coupling shape and load distribution characteristics of underwater explosion multi bubble

DOI:	10.11809/bqzbgcxb2024.06.002
Keywords:	underwater explosion; fusing bubbles; bubble pulsation; load distribution characteristics; numerical simulation
Abstract:	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.
Published:	2024-06-28
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