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arXiv 2102.04709physics.flu-dyn
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曲面运动接触线三相流的格子Boltzmann模拟

Lattice Boltzmann simulation of three-phase flows with moving contact lines on curved surfaces

Sheng Li, Yang Lu, Fei Jiang, Haihu Liu

摘要:

在格子玻尔兹曼方法的框架下,发展了一种模拟任意复杂表面上含移动接触线的三相流动的数值方法。在这种方法中,不混溶的三相流是通过一个多松弛时间的颜色梯度模型,它不仅允许一个完整的范围内的界面张力,但也产生稳定的结果,为广泛的粘度比。引入特征线模型实现润湿边界条件,该模型不仅易于实现,而且能够处理任意复杂的具有指定接触角的边界。开发的方法首先验证了Janus液滴休息在一个平面上,一个完美的Janus液滴沉积在一个气缸上,和毛细管侵入的三元流体的各种粘度比的模拟。然后,它被用来研究一个复合液滴受到均匀的来流通过一个多柱结构,其中三个不同的值的表面润湿性被认为是。模拟结果表明,表面润湿性对液滴的动力学行为和最终流体分布有重要影响。

英文摘要:

A numerical method for simulating three-phase flows with moving contact lines on arbitrarily complex surfaces is developed in the framework of lattice Boltzmann method. In this method, the immiscible three-phase flow is modeled through a multiple-relaxation-time color-gradient model, which not only allows for a full range of interfacial tensions but also produces stable outcomes for a wide range of viscosity ratios. A characteristic line model is introduced to implement the wetting boundary condition, which is not only easy to implement but also able to handle arbitrarily complex boundaries with prescribed contact angles. The developed method is first validated by the simulation of a Janus droplet resting on a flat surface, a perfect Janus droplet deposited on a cylinder, and the capillary intrusion of ternary fluids for various viscosity ratios. It is then used to study a compound droplet subject to a uniform incoming flow passing through a multi-pillar structure, where three different values of surface wettability are considered. The simulated results show that the surface wettability has significant impact on the droplet dynamic behavior and final fluid distribution.

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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