作　　者： ; ; ;

机构地区： 华南理工大学聚合物新型成型装备国家工程研究中心聚合物成形加工工程教育部重点实验室

出　　处： 《计算力学学报》 2010年第5期856-861,共6页

摘　　要： 基于涡量-速度法,得到了方腔内高粘度流体上下盖振动拖动作用下瞬时速度场数值解,采用4阶Runge-Kutta方法对示踪剂的界面形变进行数值积分追踪。结果表明,当振动频率为0.1Hz,方腔内将发生混沌混合,当频率增加到0.5Hz时,混合过程演变为常规的层流混合过程。混合过程Poincaré截面对比揭示了频率对KAM岛尺度影响。混沌混合经过一定的时间后,不同初始位置的示踪剂界面拉伸表现出自相似和渐近特性。 Based on vortex-velocity Method,the numerical solution of the transient velocity field is obtained of high viscious fluid in the square cavity driven by the vibration motion of upper and bottom lids.The deformation of the tracer is numerically integrated by the fourth order Runge-Kutta scheme.The results show that when frequency is kept at 0.1Hz,the chaotic mixing will occur in the cavity.While the frequency is increased up to 0.5Hz from 0.1Hz,the regular laminar mixing is substitued for the chaotic mixing.The contrasts of Poincarésections account for the effect of the frequency on the scales of KAM islands.During chaotic mixing process,the tracers from different initial positions are advected for a certain time,the interface stretchs reveal the properties of self-similarity and asymptoticality.

关 键 词： 周期性混合 混沌混合 界面拉伸 截面 自相似

领　　域： [化学工程]