On the shear-thinning and viscoelastic effects of blood flow under various flow rates
On the shear-thinning and viscoelastic effects of blood flow under various flow rates
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DOI：
10.1016/j.amc.2010.07.054
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发表时间：
2011-02-01
影响因子：
4
通讯作者：
Prosi, M.
中科院分区：
文献类型：
--
作者：
Bodnar, T.;Sequeira, A.;Prosi, M.
本文的目的是描述和讨论数值比较研究的结果，以证明和量化中等血管中血流的一些最相关的非牛顿特征，即其剪切变薄和粘弹性行为。在这项工作中研究的模型是经典的牛顿和奥尔德罗德- b模型，以及它们的广义（剪切-减薄）修正。在三维几何上进行了数值试验，即从医学图像重建的理想轴对称狭窄和现实狭窄的颈动脉分叉。在结构网格上，采用有限体积法得到了控制方程组的数值解。对特征流量进行了模型敏感性测试，以评估其对观察到的非牛顿效应的影响。(C) 2010爱思唯尔公司版权所有。
The aim of this paper is to describe and discuss the results of numerical comparative study performed in order to demonstrate and quantify some of the most relevant non-Newtonian characteristics of blood flow in medium-sized blood vessels, namely its shear-thinning and viscoelastic behavior.The models studied in this work are the classical Newtonian and Oldroyd-B models, as well as their generalized (shear-thinning) modifications. Numerical tests are performed on three-dimensional geometries, namely an idealized axisymmetric stenosis and a realistic stenosed carotid bifurcation reconstructed from medical images. The numerical solution of the system of governing equations is obtained by a finite-volume method on a structured grid. Model sensitivity tests are achieved with respect to the characteristic flow rate to evaluate its impact on the observed non-Newtonian effects. (C) 2010 Elsevier Inc. All rights reserved.