Effect of Varying Anastomosis Angles for Non-Newtonian Pulsatile Blood Flow through Artery Bypass Graft Models: an LES Study

Shamudra Dey, Tahsin Ibtida, C. Roy, Nuruzzaman Sakib
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引用次数: 1

Abstract

A computational analysis is performed using the Large Eddy Simulation (LES) method to predict non-Newtonian pulsatile flow of blood into Artery Bypass Graft (ABG) models with varying anastomosis angles. The traditional end-to-side bypass graft models of three distinct anastomosis angles (30°, 45° & 60°) are created on the 75% idealized arterial stenosis to serve the purpose of vascular reconstruction. A pulsatile parabolic inlet boundary condition with the contemplation of spiral component is formulated to model the naturalistic flow in the blood vessel & non-Newtonian Carreau viscosity model is used. The transient study was performed in the ANSYS Fluent 15.0. Initially, the numerical simulation process has been validated with the results of a classic experimental study and Direct Numerical Simulation (DNS) study. The numerical study found that wall shear stress has significant effect on re-blocking while pressure has smaller effect. The artery bypass configuration of 30° anastomosis angle is the most favorable one for the common end-to-side graft design. As a whole, the LES study has provided basic but novel observations of flow projection in the specific artery bypass graft (ABG) models.
不同吻合角度对非牛顿脉动血流通过动脉搭桥模型的影响:LES研究
采用大涡模拟(LES)方法对不同吻合角度的动脉旁路移植(ABG)模型的非牛顿脉动血流进行了计算分析。传统的吻合角度为30°、45°和60°的端侧旁路移植模型是在75%的理想动脉狭窄情况下建立的,以达到血管重建的目的。建立了考虑螺旋分量的脉动抛物线入口边界条件来模拟血管内的自然流动,并采用了非牛顿卡罗粘度模型。瞬态研究在ANSYS Fluent 15.0中进行。首先,数值模拟过程通过经典实验研究和直接数值模拟(DNS)研究的结果进行了验证。数值研究发现,壁面剪应力对再堵塞的影响较大,压力对再堵塞的影响较小。吻合角度为30°的旁路配置是普通端侧移植物设计的最佳选择。总的来说,LES研究为特定动脉旁路移植(ABG)模型的血流投影提供了基础但新颖的观察结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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