Numerical Study of the Lift Force, Velocities and Pressure Distribution of a Single Air Bubble and Two Interacting Air Bubbles Rising in Quiescent Liquid
Numerical Study of the Lift Force, Velocities and Pressure Distribution of a Single Air Bubble and Two Interacting Air Bubbles Rising in Quiescent Liquid
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DOI：
10.4236/ojfd.2020.101003
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发表时间：
2020-03
期刊：
影响因子：
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通讯作者：
C. Guan;S. Yanase;K. Matsuura;T. Kouchi;Yasunori Nagata
中科院分区：
文献类型：
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作者：
C. Guan;S. Yanase;K. Matsuura;T. Kouchi;Yasunori Nagata
由液体和气泡组成的多相流的研究一直吸引着许多研究者的兴趣。然而，这样的系统的数值方法，面临着困难的数值精度和沉重的计算负荷。本文对前人提出的改进的力耦合方法进行了修正，并将其应用于单个气泡在竖直壁面附近上升和两个相互作用的气泡在静止液体中直线上升的数值研究。对力耦合法的有效范围进行了修正。计算结果表明，由实验数据得到的作用在气泡上的升力比我们以前的方法更准确地再现。精确地计算了实验中得到的两个相互作用的直线上升气泡的速度随时间的演化，解决了气泡相对运动的物理机制。与流体体积法等其他方法相比，本方法具有计算速度快、存储容量小等优点。
The study of multiphase flow consisting of liquid and air bubbles has been attracting the interest of many researchers. Numerical methods for such a system are, however, facing difficulty in numerical accuracy and a heavy computational load. In this paper, we made corrections to the modified force-coupling method in our previous papers and applied it to the numerical studies of a single air bubble rising near a vertical wall and two interacting air bubbles rising in line in quiescent liquid. Corrections were made to the effective ranges of the force-coupling method. The calculation results showed that the lift force acting on an air bubble obtained by the experimental data was more accurately reproduced than those by our previous method. We accurately calculated the time evolution of the velocities of interacting two air bubbles rising in line obtained in the previous experiments and resolved the physical mechanism of the relative movement of two bubbles. We also found the present method is much quicker and needs much smaller memory capacity than other methods, such as the volume of fluid method.