The buoyancy-driven motion of a single skirted bubble or drop rising through a viscous liquid
The buoyancy-driven motion of a single skirted bubble or drop rising through a viscous liquid
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DOI：
10.1063/1.4765669
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发表时间：
2012-11
影响因子：
4.6
通讯作者：
M. Ohta;M. Sussman
中科院分区：
文献类型：
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作者：
M. Ohta;M. Sussman
通过三维轴对称计算，对单个裙状气泡或液滴在粘性液体中上升的浮力驱动运动进行了计算研究。数值求解了不可压缩双流体流动的Navier-Stokes方程，采用耦合的水平集和流体体积法模拟了变形气泡/液滴边界，并通过锐界面数值处理在变形边界上施加界面跳跃条件。动态，块结构的自适应网格细化，以充分解决薄裙。结果的灵敏度的拖尾气泡/滴裙的厚度的密度比和粘度比的报告。结果表明，密度比（而不是密度差）和粘度比都影响裙部厚度。通过我们的计算，可以改进以前预测裙部厚度的理论。同时还发现，气泡和液滴薄裙的形成对气泡的形成有重要影响。
The buoyancy-driven motion of a single skirted bubble or drop rising through a viscous liquid is computationally explored by way of 3d-axisymmetric computations. The Navier-Stokes equations for incompressible two-fluid flow are solved numerically in which the coupled level-set and volume-of-fluid method is used to simulate the deforming bubble/drop boundary and the interface jump conditions on the deforming boundary are enforced through a sharp interface numerical treatment. Dynamic, block structured adaptive grid refinement is employed in order to sufficiently resolve the thin skirts. Results on the sensitivity of the thickness of trailing bubble/drop skirts to the density ratio and viscosity ratio are reported. It is shown that both the density ratio (not the density difference) and the viscosity ratio effect the skirt thickness. Previous theory for predicting skirt thickness can be refined as a result of our calculations. It is also discovered that the formation of thin skirts for bubbles and drops hav...