Direct numerical simulation of variable surface tension flows using a Volume-of-Fluid method
Direct numerical simulation of variable surface tension flows using a Volume-of-Fluid method
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DOI：
10.1016/j.jcp.2017.10.008
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发表时间：
2018-01-01
影响因子：
4.1
通讯作者：
Kondic, Lou
中科院分区：
文献类型：
--
作者：
Seric, Ivana;Afkhami, Shahriar;Kondic, Lou
我们开发了一种通用方法，用于将可变表面张力系数包含到基于流体体积的Navier-Stokes求解器中。这种新的数值模型通过使用高度函数求出界面上的切线方向，为直接计算表面梯度提供了一种稳健而准确的方法。该实现适用于依赖于温度和浓度的表面张力系数，以及涉及流体与其周围之间的温度较大跳跃的设置，以及应将浓度严格限制在流体区域的情况，例如具有不同表面张力系数的流体的混合。我们证明了我们的方法适用于气泡的热毛细迁移和具有不同表面张力系数的液滴的合并。(C)2017 Elsevier Inc.保留所有权利。
We develop a general methodology for the inclusion of a variable surface tension coefficient into a Volume-of-Fluid based Navier-Stokes solver. This new numerical model provides a robust and accurate method for computing the surface gradients directly by finding the tangent directions on the interface using height functions. The implementation is applicable to both temperature and concentration dependent surface tension coefficient, along with the setups involving a large jump in the temperature between the fluid and its surrounding, as well as the situations where the concentration should be strictly confined to the fluid domain, such as the mixing of fluids with different surface tension coefficients. We demonstrate the applicability of our method to the thermocapillary migration of bubbles and the coalescence of drops characterized by a different surface tension coefficient. (c) 2017 Elsevier Inc. All rights reserved.