Hypothesis

While multiphase flows, particularly droplet dynamics, are ordinary in nature as well as in industrial processes, their mathematical and computational modelling continue to pose challenging research tasks - patent approaches for tackling them are yet to be found. The lack of analytical flow field solutions for non-trivial droplet dynamics hinders validation of computer simulations and, hence, their application in research problems. High-speed videos and computer vision algorithms can provide a viable approach to validate simulations directly against experiments.

Experiments

Droplets of water (or glycerol-water mixtures) impacting on both hydrophobic and superhydrophobic surfaces were imaged with a high-speed camera. The corresponding configurations were simulated using a lattice-Boltzmann multiphase scheme. Video frames from experiments and simulations were compared, by means of computer vision, over entire droplet impact events.

Findings

The proposed experimental validation procedure provides a detailed, dynamic one-on-one comparison of a droplet impact. The procedure relies on high-speed video recording of the experiments, computer vision, and on a software package for the analyzation routines. The procedure is able to quantitatively validate computer simulations against experiments and it is widely applicable to multiphase flow systems in general.

中文翻译：

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流体流动模拟满足高速视频的需求：液滴动态的计算机视觉比较

假设

虽然多相流，特别是液滴动力学，在自然界和工业过程中都是很普通的，但它们的数学和计算模型仍继续构成具有挑战性的研究任务-尚未找到解决这些问题的专利方法。非平凡液滴动力学分析流场解决方案的缺乏阻碍了计算机仿真的验证，因此，它们在研究问题中的应用。高速视频和计算机视觉算法可以提供一种可行的方法来直接针对实验验证仿真。

实验

用高速照相机对撞击在疏水性表面和超疏水性表面上的水滴（或甘油-水混合物）进行成像。使用晶格-玻尔兹曼多相方案模拟了相应的构型。通过计算机视觉，比较了来自实验和模拟的视频帧对整个液滴撞击事件的影响。

发现

拟议的实验验证程序提供了液滴冲击的详细，动态的一对一比较。该程序依赖于实验的高速视频记录，计算机视觉以及用于分析例程的软件包。该程序能够相对于实验定量验证计算机仿真，并且通常广泛应用于多相流系统。