Numerical study of spike characteristics due to the motions of a non-spherical rebounding bubble

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• 作者：Jia-xia WANG ((王加夏))^a ; ^{jxwang66@yeah.net" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Zhi ZONG ((宗智))^a ; ^{zongzhi@dlut.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Lei SUN ((孙雷))^a ; Zhang-rui LI ((李章锐))^b ; Ming-zuo JIANG ((姜明佐))^c
• 关键词：boundary integral method ; toroidal bubble ; free surface spike
• 刊名：Journal of Hydrodynamics, Ser. B
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：28
• 期：1
• 页码：52-65
• 全文大小：3407 K

文摘

The boundary integral method (BIM) is used to simulate the 3-D gas bubble, generated within the two bubble pulsation periods in proximity to a free surface in an inviscid, incompressible and irrotational flow. The present method is well validated by comparing the calculated shapes of the bubble and the free surface with both the experimental results and the numerical ones obtained by the Axisymmetric BIM code. The expansion, the collapse of the gas bubble and the further evolution of the rebounding non-spherical bubble are simulated. The various variation patterns of the free surface spike and the bubble centroid for different standoff distances, the buoyancy parameters and the strength parameters are obtained to reveal the nonlinear interaction between the bubble and the free surface. The amplitude of the second maximum bubble volume and the four typical patterns of the bubble jet and the free surface spike are examined in the context of the standoff distance. The large buoyancy is used to elevate the spray dome rather than the free surface spike.