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主页 旧刊 有关人员 未来大会 American Society of Thermal and Fluids Engineering

ISSN 在线: 2379-1748

ISBN 打印: 978-1-56700-517-2 (Flash drive)

5-6th Thermal and Fluids Engineering Conference (TFEC)
May, 26–28, 2021 , Virtual

IMAGING SPATIAL AND TEMPORAL FLOW CHARACTERISTICS IN A CURVED ASYMMETRIC STENOSED ARTERIAL MODEL

Get access pages 607-616
DOI: 10.1615/TFEC2021.bio.032534

摘要

The presence of stenosis in the curved portion of the human vasculature generates altered flow patterns superimposed on pulsatile flow. Specifically, three-dimensional vorticity patterns are generated, impacting the shear and pressure loading of the artery. Spatio-temporal wall loading has been suggested to lead to thrombosis and result in patient fatality. Three-dimensional numerical simulation of pulsatile flow in a bent artery with a constriction (Re ~ 300-1200 and Wo ~ 7.62.) using ANSYS Fluent is reported. Numerical data is compared against limited PIV measurements in terms of streamwise vorticity patterns (d2 criteria) at distinct phases of the flow field. The effect of blood rheology for the flow at peak Re 1200 is also investigated through the simulations. Simulation data over a range of Reynolds numbers is presented in the form of phase-wise distribution of stream traces, wall shear stress, and the oscillatory shear index. Results reveal that, in comparison to a healthy unblocked artery, a bent stenosed artery results in larger recirculation patterns within the post-stenotic region. These structures oscillate within the artery in time, making the oscillatory shear index close to 0.5. Additionally, wall shear stress (WSS) is low, confirming that stenosis heightens wall loading in comparison to a clear bent artery.
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