Interaction of a strong shockwave with a gas bubble in a liquid medium: a numerical study
Interaction of a strong shockwave with a gas bubble in a liquid medium: a numerical study
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DOI：
10.1017/jfm.2012.132
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发表时间：
2012-06-25
影响因子：
3.7
通讯作者：
Ventikos, Y.
中科院分区：
文献类型：
--
作者：
Hawker, N. A.;Ventikos, Y.
冲击波与液体介质中气泡的相互作用是激波碎石、空化损伤和声致发光研究等领域的研究热点。本研究采用高分辨率的前沿跟踪框架对这一现象进行了数值研究。建模范例得到了广泛的验证，然后被用于探索感兴趣的参数空间。我们根据主导每个阶段的主要特征，对崩溃过程进行了全面的定性分析，并将其分为三个阶段。这导致了许多以前未确定的特征的特征，这些特征在该过程的演变和峰值温度和压力的出现中具有重要意义。例如，我们发现，峰值压力不是由于主横向喷流(也称为再入喷流)的撞击而出现的，而是在随后的坍塌中出现的。我们进行了全三维模拟，表明三维不稳定性仅限于坍塌的小范围细节，并通过比较圆柱形和球形气泡的坍塌继续进行。我们详细地研究了冲击强度从100 Mpa到100 Gpa的参数变化。一个与直觉相反的发现是，最大气体密度随着冲击波强度的增加而降低。
The interaction of a shockwave with a gas bubble in a liquid medium is of interest in a variety of areas, e.g. shockwave lithotripsy, cavitation damage and the study of sonoluminescence. This study employs a high-resolution front-tracking framework to numerically investigate this phenomenon. The modelling paradigm is validated extensively and then used to explore the parametric space of interest. We provide a comprehensive qualitative analysis of the collapse process, which we categorize into three phases, based on the principal feature dominating each phase. This results in the characterization of numerous previously unidentified features important in the evolution of the process and in the emergence of peak temperatures and pressures. For example, we discover that the peak pressure does not occur as a result of the impact of the main transverse jet (also called the re-entrant jet) but later in the collapse. We perform fully three-dimensional simulations, showing that three-dimensional instabilities are limited to the small-scale details of collapse, and continue by comparing collapse of cylindrical and spherical bubbles. We detail a parametric investigation varying the shock strength from 100 MPa to 100 GPa. A counter-intuitive discovery is that the maximum gas density decreases with increasing shock strength.