Wetting boundaries for a ternary high-density-ratio lattice Boltzmann method.
Wetting boundaries for a ternary high-density-ratio lattice Boltzmann method.
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DOI：
10.1103/physreve.100.013308
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发表时间：
2019-04
期刊：
影响因子：
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通讯作者：
N. Bala;M. Pepona;I. Karlin;H. Kusumaatmaja;C. Semprebon
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文献类型：
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作者：
N. Bala;M. Pepona;I. Karlin;H. Kusumaatmaja;C. Semprebon
我们扩展了最近提出的三元自由能晶格玻尔兹曼模型与高密度对比度[物理。120，234501（2018）PRLTAO 0031 -900710.1103/PhysRevLett.120.234501]通过在固体壁处引入润湿边界。这些方法是基于强制和几何方案，与实施优化的三元（更一般地说，高阶多组分）模型。每种方法的优点和缺点都通过进行静态和动态测试来解决，包括取代气相的液体的毛细管填充动力学和一列液滴的自推进运动。此外，我们测量动态角，并表明，滑移长度关键取决于平衡值的接触角和它是否属于液-液或液-气界面。这些结果验证了模型的能力，模拟复杂的三元流体动力学问题附近的固体边界，例如，落冲击固体基板覆盖的润滑层。
We extend a recently proposed ternary free-energy lattice Boltzmann model with high density contrast [Phys. Rev. Lett. 120, 234501 (2018)PRLTAO0031-900710.1103/PhysRevLett.120.234501] by incorporating wetting boundaries at solid walls. The approaches are based on forcing and geometric schemes, with implementations optimized for ternary (and, more generally, higher-order multicomponent) models. Advantages and disadvantages of each method are addressed by performing both static and dynamic tests, including the capillary filling dynamics of a liquid displacing the gas phase and the self-propelled motion of a train of drops. Furthermore, we measure dynamic angles and show that the slip length critically depends on the equilibrium value of the contact angles and whether it belongs to liquid-liquid or liquid-gas interfaces. These results validate the model capabilities of simulating complex ternary fluid dynamic problems near solid boundaries, for example, drop impact solid substrates covered by a lubricant layer.