Lattice Boltzmann Simulation of One Particle Migrating in a Pulsating Flow in Microvessel

• Published in: Communications in theoretical physics Vol. 56; no. 10; pp. 756 - 760
• Main Author: 邱冰 谭惠丽 李华兵
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.10.2011
• Subjects: Computational fluid dynamics; Computer simulation; Dynamic tests; Fluid flow; Heart rate; Lattices; Pulsation; Reynolds number; 平衡位置; 微血管; 悬浮颗粒; 格子Boltzmann模型; 模拟; 粒子迁移; 脉动流; 运动轨迹
• ISSN: 0253-6102
• DOI: 10.1088/0253-6102/56/4/27

A lattice Boltzmann model of two dimensions is used to simulate the movement of a single rigid particle suspended in a pulsating flow in micro vessel The particle is as big as a red blood cell, and the micro vessel is four times as wide as the diameter of the particle. It is found that Segrd-Silberberg effect will not respond to the pulsation of the flow when the Reynolds number is relatively high. However, when the Reynolds number is low enough, Segrd-Silberberg effect disappears. In the steady flow, different initial position leads to different equilibrium positions. In a pulsating flow, different frequencies of pulsation also cause different equilibrium positions. Particularly, when the frequency of pulsation is closed to the human heart rate, Segrd-Silberberg effect presents again. The evolutions of velocity, rotation, and trajectory of the particle are investigated to find the dynamics of such abnormal phenomenon.