气泡群动力特性模拟分析

Numerical simulation of dynamic properties of bubble clusters

采用VOF(volume-of-fluid)中的PLIC(piecewise linear interface calculation)界面重构方法模拟研究了三维气泡群的上升过程及其对周围流场的扰动.重点分析考察了大量气泡上升过程中的动力学特性,伴随着随机的碰撞与融合等现象,气泡分布经历了由规则到扇形体再到随机的过程;在大雷诺数时融合过程表现为整体行为.受到融合过程的影响,周围流场表现出明显的振荡现象,且气泡群中心受到的扰动高于外围流体.

The piecewise linear interface calculation （PLIC） of the volume-of-fluid （VOF） method was employed to simulate the rising process of 3D bubble clusters and their disturbing to the surrounding flow fields. The dynamic characteristics of a large number of bubbles during the rising process were highlighted. With the phenomena of random collision and mergence, the distribution of the bubbles experienced the process of regular, fanwise and random. When the Reynolds number was large, the mergence of the bubbles exhibited a state of total behavior. The surrounding flow fields showed obvious fluctuation owing to the influence of the mergence, and the disturbance in the center of the bubbles was larger than that outside the bubbles.