Diffuse interface modeling of three-phase contact line dynamics on curved boundaries: A lattice Boltzmann model for large density and viscosity ratios
Diffuse interface modeling of three-phase contact line dynamics on curved boundaries: A lattice Boltzmann model for large density and viscosity ratios
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DOI：
10.1016/j.jcp.2017.01.025
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发表时间：
2017-04-01
影响因子：
4.1
通讯作者：
Bolster, Diogo
中科院分区：
文献类型：
--
作者：
Fakhari, Abbas;Bolster, Diogo
我们介绍了一种简单而有效的格子Boltzmann方法，能够处理大的密度和粘度对比度。该模型基于扩散界面相场方法。在此背景下，我们提出了一种新的算法，用于在结构笛卡尔网格的框架内指定曲线边界上的三相接触角。与常用的用阶梯逼近曲线边界的方法相比，该方法具有更高的计算精度。我们将该模型应用于四个基准问题：(I)液滴在平面上的润湿和去湿，(Ii)在圆柱表面上的润湿和去湿，(Iii)以中等雷诺数通过圆柱体的多相流动，以及(Iv)不同条件下落在亲水和超疏水圆柱上的液滴。在可用的情况下，我们的结果与解析解和/或现有的实验数据显示出很好的一致性，突出了这种新方法的优势。(C)2017 Elsevier Inc.保留所有权利。
We introduce a simple and efficient lattice Boltzmann method for immiscible multiphase flows, capable of handling large density and viscosity contrasts. The model is based on a diffuse-interface phase-field approach. Within this context we propose a new algorithm for specifying the three-phase contact angle on curved boundaries within the framework of structured Cartesian grids. The proposed method has superior computational accuracy compared with the common approach of approximating curved boundaries with stair cases. We test the model by applying it to four benchmark problems: (i) wetting and dewetting of a droplet on a flat surface and (ii) on a cylindrical surface, (iii) multiphase flow past a circular cylinder at an intermediate Reynolds number, and (iv) a droplet falling on hydrophilic and superhydrophobic circular cylinders under differing conditions. Where available, our results show good agreement with analytical solutions and/or existing experimental data, highlighting strengths of this new approach. (C) 2017 Elsevier Inc. All rights reserved.