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Numerical investigation of the interactions between a laser-generated bubble and a particle near a solid wall
Journal of Hydrodynamics ( IF 2.5 ) Pub Date : 2021-04-23 , DOI: 10.1007/s42241-021-0029-5
Jian-yong Yin , Yong-xue Zhang , Jian-jun Zhu , Liang Lü , Shi-da Li

The interactions between the bubbles and the particles near structures are important issues for the applications of the cavitation in the fluid machinery. To study the hidden microscopic mechanisms, a numerical method for simulating the laser-generated bubble between the solid wall and a particle is developed in this paper with considerations of the viscosities and the compressibility of the gas and the liquid phases, as well as the surface tension between them. The gas-liquid interface is tracked by the coupling level set and the volume of fluid (CLSVOF) method. The numerical results clearly reveal that the particle can influence the cavitation bubble behaviors. The potential damage of the nearby structures is numerically quantified in terms of the wall pressure, which helps better understand the synergetic effects of the particle on the cavitation. The effects of three dimensionless parameters on the wall pressure are also investigated, especially, on the peak pressure, namely, γ1 (defined as L1 / Rmax, where L1 is the distance from the center of the initial bubble to the solid wall and Rmax is the maximum bubble radius), γ2 (defined as L2 / Rmax, where L2 is the distance from the lower surface of the spherical particle to the initial bubble center) and θ (defined as Rp / Rmax, where Rp is the spherical particle radius). Further numerical results show that these parameters play a dominant role in determining the peak pressure. When γ1 < 1.00, the peak pressure on the solid wall during the bubble collapse is mainly resulted from the liquid jet. When γ1 > 1.00, the peak pressure is caused by the shock wave. With the increase of θ or decrease of γ2, the peak pressure increases. When γ2 > 2.00, the effect of the particle on the bubble behavior can be neglected.



中文翻译:

激光产生的气泡与固体壁附近颗粒之间相互作用的数值研究

气泡与靠近结构的颗粒之间的相互作用对于气穴在流体机械中的应用是重要的问题。为了研究隐藏的微观机理,本文考虑了气相和液相以及表面的粘度和可压缩性,开发了一种数值方法来模拟激光在固体壁和颗粒之间产生的气泡。他们之间的紧张关系。气液界面通过耦合液位设置和流体体积(CLSVOF)方法进行跟踪。数值结果清楚地表明,颗粒可以影响空化气泡的行为。根据墙体压力,对附近结构的潜在破坏进行了数值量化,这有助于更好地了解颗粒对空化的协同作用。还研究了三个无因次参数对壁压力的影响,特别是对峰值压力的影响,即γ 1(定义为大号1 / [R最大,其中大号1是从初始气泡的中心到固体壁的距离和- [R最大是最大气泡半径),γ 2(定义为大号2 / [R最大,其中L 2是从球形粒子下表面到初始气泡中心的距离)和θ(定义为R p / R max,其中R p是球形粒子半径)。进一步的数值结果表明,这些参数在确定峰值压力中起主要作用。当γ 1 <1.00,在气泡破裂时的实心壁的峰值压力主要起因于液体喷射。当γ 1 > 1.00时,峰值压力由冲击波引起的。用的增加θ或下降γ 2,峰值压力增大。当γ 2 > 2.00,在气泡行为颗粒的影响可以忽略。

更新日期:2021-04-29
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