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A robust and accurate technique for Lagrangian tracking of bubbles and detecting fragmentation and coalescence
International Journal of Multiphase Flow ( IF 3.8 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.ijmultiphaseflow.2020.103523
Qiang Gao , Grant B. Deane , Han Liu , Lian Shen

Abstract A technique for Lagrangian tracking of bubbles and detecting their time-evolution behaviors is presented. Five possible behaviors are considered: formation, extinction, continuity, binary fragmentation, and binary coalescence. The technique is based on establishing a network of mappings between bubbles identified at adjacent time instants. The mappings are determined by selecting the minimum from a set of pseudo-distance errors, which are themselves based on constraints imposed on bubble position, velocity, and volume between adjacent time instants. The technique is validated through numerical inspection of the pseudo-distance errors and visual verification of over 16000 bubble events identified in a simulated breaking wave. The accuracies for continuity, binary fragmentation, and binary coalescence are estimated to be 99.5 % , 90 % , and 95 % , respectively, when the analysis is limited to bubbles of sizes of at least two grid lengths. The effects of varying pseudo-distance error parameters and time resolution are also investigated. The technique robustly tracks bubbles and the occurrence of binary fragmentation and binary coalescence in a breaking wave when these processes occur away from the complex air–water interface structures and bubbles are of comparable scale. Detecting the fragmentation and coalescence of large-scale and complex air–water interfaces remains an outstanding problem.

中文翻译:

一种用于气泡的拉格朗日跟踪以及检测碎片和聚结的稳健而准确的技术

摘要 提出了一种气泡的拉格朗日跟踪和检测其时间演化行为的技术。考虑了五种可能的行为:形成、灭绝、连续性、二元分裂和二元合并。该技术基于在相邻时刻识别的气泡之间建立映射网络。映射是通过从一组伪距离误差中选择最小值来确定的,这些伪距离误差本身基于对相邻时刻之间气泡位置、速度和体积的约束。该技术通过伪距离误差的数值检查和模拟破碎波中识别的 16000 多个气泡事件的视觉验证得到验证。连续性、二元分裂和二元合并的准确度估计为 99.5 % 、 90 % 、当分析仅限于至少两个网格长度的气泡大小时,分别为 和 95 %。还研究了变化的伪距离误差参数和时间分辨率的影响。当这些过程发生在远离复杂的气水界面结构且气泡具有可比规模时,该技术可以稳健地跟踪气泡以及破碎波中二元破碎和二元聚结的发生。检测大规模和复杂的气水界面的破碎和聚结仍然是一个突出的问题。当这些过程发生在远离复杂的气水界面结构且气泡具有可比规模时,该技术可以稳健地跟踪气泡以及破碎波中二元破碎和二元聚结的发生。检测大规模和复杂的气水界面的破碎和聚结仍然是一个突出的问题。当这些过程发生在远离复杂的气水界面结构且气泡具有可比规模时,该技术可以稳健地跟踪气泡以及破碎波中二元破碎和二元聚结的发生。检测大规模和复杂的气水界面的破碎和聚结仍然是一个突出的问题。
更新日期:2021-02-01
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