基于OpenFOAM对两气泡间相互作用的研究

Study of the Interaction between Two Bubbles Based on OpenFOAM

摘要: 本文基于OpenFOAM软件，选用SIMPLEC算法，采用VOF模型中的PLIC界面几何重构方法，模拟研究了二维水平分布和竖直分布的两气泡在静水中运动时形状的变化，周围流场变化及气泡与流场相互影响的整个过程，同时还分析了气泡间距，容器宽度对气泡运动的影响。结果表明：不同时刻，气泡在上升过程中以不同的形状对称分布，且由于涡流场的存在引起水平分布的两气泡在上升过程中反复的相互吸引和排斥，呈摇摆状上升；而垂直分布的两气泡则会出现反复融合和分离的现象。气泡间距越大，两气泡间的相互作用越小。容器越宽，气泡运动受其影响越小。

Abstract: Applying the OpenFOAM software by adopting the SIMPLEC algorithm and VOF model of the PLIC, the motion characteristics of two bubbles (horizontal and vertical distribution) in still water were numerically simulated. The process of bubble shape deformation, the flow field changes around the bubbles, the interaction between the bubbles and flow field, and the influence of the separation distance and the width of container on bubbles motion were analyzed in detail. The results showed that the bubbles are symmetrically distributed in different shapes at different moments. Due to the existence of the vortex field, the two horizontal bubbles attract or repulse each other periodically in the process of rising, and meanwhile the bubbles will swing up. But, the two vertical distribution bubbles will coalesce or separate repeatedly. With the increasing distance of the two bubbles, the interaction strength becomes smaller. With the increasing width of the container, the influence of container on bubbles motion becomes smaller.