颈动脉系统生物流体动力学的数值研究

Rohit Shenoy, H. N. Abhilash, A. A. Basri, A. Barboza, G. Shenoy B, R. Pai, A. Khader
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引用次数: 0

摘要

计算流体动力学(CFD)已被广泛用于理解颈动脉分叉系统的血流动力学,并可视化由于颈动脉几何变化而引起的血流变化。这些研究将有助于了解动脉血流行为和动脉粥样硬化。本研究主要研究生理压力条件下的几何变量患者特异性健康颈动脉分叉系统。在ANSYS Fluent中对刚性壁面和非牛顿条件下的非定常流场进行了数值模拟。血流动力学参数,如压力、速度、涡度、螺旋度和时间平均壁剪切应力(TAWSS)进行评估,以可视化和了解分岔系统关键区域的流动动力学。此外,还研究了几何对分岔区影响的重要性,导致了显著的涡形成区。观察到速度和回流形成的显著降低,这是减小剪切应力的原因。研究还表明,分叉区周围的低TAWSS区域更容易发生动脉粥样硬化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study of Bio-Fluid Dynamics in Carotid Artery System Using Numerical Methods
Computational Fluid Dynamics (CFD) has been largely used in understanding the haemodynamics of the carotid bifurcation system and to visualise the blood flow changes due to the carotid artery geometric variations. Such studies will be helpful in understanding the arterial blood flow behavior and atherosclerosis. The present study focuses on investigation of geometric variable patient-specific healthy carotid bifurcation system under physiological pressure conditions. Unsteady flow simulation is conducted in ANSYS Fluent under the rigid wall and non-Newtonian conditions. The haemodynamic parameters such as pressure, velocity, vorticity, helicity, and time-averaged wall shear stress (TAWSS) were evaluated to visualise and understand flow dynamics at critical zones of bifurcation system. Further, the importance of geometric influence on the bifurcation zone was also investigated, causing significant vortex formation zones. A considerable reduction in velocity and backflow formation was observed, which is responsible for reducing the shear stress. It is also demonstrated that low TAWSS regions surrounding the bifurcation zone are more prone to atherosclerosis development.
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