arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2302.02728physics.flu-dyn
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高能液滴撞击深液池的分析

Analysis of high-energy drop impact onto deep liquid pool

Hui Wang, Shuo Liu, Annie-Claude Bayeul-Lainé, David Murphy, Joseph Katz, Olivier Coutier-Delgosha

摘要:

本文研究了液滴撞击深液池的问题。它的重点是高能量飞溅制度的影响,造成的大雨滴在高速的影响。这些案件的特点是时间短,机制复杂,因此迄今为止很少受到关注。BASILISK开源求解器用于执行三维直接数值模拟(DNS)。八叉树自适应网格细化技术的能力,使捕捉流动的小尺度特征,而流体体积(VOF)的方法结合平衡力表面张力计算被应用到平流的液体的体积分数和重建的接口。数值计算结果与实验可视化比较良好:冠和腔的演变,韧带的发散,气泡冠的形成,和向下的螺旋射流的增长,穿透腔底,正确地再现。可靠的定量协议也获得了关于通过观察窗口的边缘位置,腔体尺寸和液滴分布的时间演变。此外,模拟可以访问内部流动的各个方面(速度,涡度,压力,能量预算),从而可以更好地解释相应的物理现象。详细讨论了气泡环捕获和飞溅性能的早期动力学,气泡冠的形成/崩溃,和液滴的传播。液滴尺寸的统计显示双峰分布的时间,证实了不同的主要机制,液滴生产在不同的阶段。

英文摘要:

The present work is devoted to the analysis of drop impact onto a deep liquid pool. It is focused on the effects of high-energy splash regimes, caused by the impact of large raindrops at high velocities. Such cases are characterized by short time scales and complex mechanisms, and they have thus received little attention until now. The BASILISK open-source solver is used to perform three-dimensional Direct Numerical Simulations (DNS). The capabilities of the octree adaptive mesh refinement techniques enable to capture the small-scale features of the flow, while the Volume of Fluid (VOF) approach combined with a balanced force surface tension calculation is applied to advect the volume fraction of the liquids and reconstruct the interfaces. The numerical results compare well with experimental visualizations: both the evolution of crown and cavity, the emanation of ligaments, the formation of bubble canopy, and the growth of the downward spiral jet that pierces through the cavity bottom, are correctly reproduced. Reliable quantitative agreements are also obtained regarding the time evolution of rim positions, cavity dimensions and droplet distributions through an observation window. Furthermore, simulation gives access to various aspects of the internal flows (velocity, vorticity, pressure, energy budget), which allows to better explain the corresponding physical phenomena. Details of the early dynamics of bubble ring entrapment and splashing performance, the formation/collapse of bubble canopy, and the spreading of drop liquid, are discussed. The statistics of droplet size show the bimodal distribution in time, corroborating distinct primary mechanisms of droplet production at different stages.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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