Eulerian Finite-Element Numerical Simulation Investigation on the Dynamic Characteristics of Out-of-Phase Bubbles in Underwater Explosions
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摘要: 该研究基于Euler有限元方法建立了水下爆炸异相气泡动力学模型，将计算结果和气泡统一理论以及异相爆炸试验进行对比验证计算模型的有效性. 通过和自由场单气泡进行对比分析，发现异相爆炸冲击波对气泡做功是异相爆炸气泡总能量增加的原因，相位差绝对值越接近π、距离参数越小气泡总能量损失越少，后产生的气泡会使先产生的气泡提前坍缩. 气泡的射流方向受相位差影响，相位差为零时产生对向射流，其他相位差产生反向射流.Abstract: An underwater explosion out-of-phase bubbles dynamics model was developed based on the Eulerian finite-element method, with the calculation results compared to the unified bubble theory and the out-of-phase explosion experiment to validate the calculation model. Compared with the case of a single bubble in the free field, it is found that the work done by the shock wave of the out-of-phase explosion on the bubble is the cause for the increase of the total energy of the bubble. The closer the absolute value of the phase difference is to π, the smaller the distance parameter is, and the less the total energy loss of the bubble is. The later bubble can cause the first bubble to collapse in advance. The jet direction of the bubble is influenced by the phase difference. When the phase difference is zero, jets are directed toward each other, but for other phase differences, the backward jets occur.(Contributed by ZHANG Aman, M. AMM Editorial Board)
1) (我刊编委张阿漫来稿) -
图 2 EFEM计算结果与气泡统一理论[40]计算结果对比
注 为了解释图中的颜色，读者可以参考本文的电子网页版本，后同.
Figure 2. Comparisons between the EFEM calculation results and the unified theory calculation results
图 4 异相爆炸双气泡和自由场单气泡对比
Figure 4. The comparison between out-of-phase explosion bubbles and the free-field single bubble
图 5 异相爆炸双气泡和自由场单气泡的能量变化
Figure 5. Energy changes of out-of-phase explosion bubbles and the free-field single bubble
图 6 不同相位异相爆炸双气泡的迁移
Figure 6. Migration histories of out-of-phase explosion bubbles in different phases
图 7 不同相位异相爆炸双气泡的周期
Figure 7. Periods of out-of-phase explosion bubbles in different phases
图 8 不同相位异相爆炸双气泡系统的总能量变化
Figure 8. Total energy changes of out-of-phase explosion bubbles system with different phases
图 9 不同距离参数异相爆炸双气泡动态特性
Figure 9. Dynamic characteristics of out-of-phase explosion bubbles with different distance parameters
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