Lattice Boltzmann simulation on particle suspensions in a two-dimensional symmetric stenotic artery.
Lattice Boltzmann simulation on particle suspensions in a two-dimensional symmetric stenotic artery.
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DOI：
10.1103/physreve.69.031919
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发表时间：
2004-03
期刊：
影响因子：
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通讯作者：
Hua-bing Li;H. Fang;Zhifang Lin;Shixiong Xu;Shiyi Chen
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文献类型：
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作者：
Hua-bing Li;H. Fang;Zhifang Lin;Shixiong Xu;Shiyi Chen
将晶格玻尔兹曼模拟技术应用于模拟动脉狭窄的二维粒子悬浮液的研究。狭窄模型由平面通道中两侧对称的半圆组成，狭窄喉道宽度大于d小于2d，其中d为颗粒直径。当初始只有一个粒子处于偏离中心线的位置时，粒子通过狭窄后会向偏离中心线的方向移动，并且在狭窄喉部处的速度远大于在扁平管中的速度。只有当两个粒子的位置与中心线对称到非常高的精度时，流动才能被两个粒子完全阻挡。一个非常小的不对称会在狭窄喉部附近被放大因为其中一个粒子会回去留出空间让另一个粒子先通过狭窄这样粒子就不会被阻塞。当不对称非常小且狭窄喉部的宽度在两个临界值之间时，观察到粒子之间以及粒子与近端突起之间存在吸引相互作用的证据。通过模拟多粒子悬浮液，研究了颗粒的红细胞压积分布。研究发现，狭窄喉道宽度对远离狭窄的扁平管内颗粒的红细胞压积分布有显著影响。
The technique of lattice Boltzmann simulation has been applied to the study of two-dimensional particle suspensions through a modeled arterial stenosis. The stenosis model consists of two-side symmetric semicirculars in a planar channel with the width of the stenosis throat larger than d and less than 2d, where d is the diameter of the particles. When only one particle is positioned off-centerline initially, the particle migrates off-centerline after passing the stenosis and the velocity at the stenosis throat is much larger than that in a flat tube. Only when two particles are positioned symmetrically to the centerline to a very high accuracy can the flow be blocked by two particles completely. A very small asymmetry will be amplified proximal to the stenosis throat in that one of the particles goes back to leave space to let the other particle passing the stenosis first so that the particles cannot be blocked. An evidence of attractive interactions between the particles as well as a particle and a proximal protuberance is observed when the asymmetry is very small and the width at the stenosis throat is between two critical values. The hematocrit distribution of the particles is studied by simulating multiparticle suspensions. It is found that the width of the stenosis throat has a significant influence on the hematocrit distribution of the particles in the flat tubes far from the stenosis.