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首页> 外文期刊>Journal of Biomechanics >Analysis of thoracic aorta hemodynamics using 3D particle tracking velocimetry and computational fluid dynamics
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Analysis of thoracic aorta hemodynamics using 3D particle tracking velocimetry and computational fluid dynamics

机译:使用3D粒子跟踪测速仪和计算流体力学分析胸主动脉血流动力学

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摘要

Parallel to the massive use of image-based computational hemodynamics to study the complex flow establishing in the human aorta, the need for suitable experimental techniques and ad hoc cases for the validation and benchmarking of numerical codes has grown more and more.Here we present a study where the 3D pulsatile flow in an anatomically realistic phantom of human ascending aorta is investigated both experimentally and computationally. The experimental study uses 3D particle tracking velocimetry (PTV) to characterize the flow field in vitro, while finite volume method is applied to numerically solve the governing equations of motion in the same domain, under the same conditions. Our findings show that there is an excellent agreement between computational and measured flow fields during the forward flow phase, while the agreement is poorer during the reverse flow phase.In conclusion, here we demonstrate that 3D PTV is very suitable for a detailed study of complex unsteady flows as in aorta and for validating computational models of aortic hemodynamics.In a future step, it will be possible to take advantage from the ability of 3D PTV to evaluate velocity fluctuations and, for this reason, to gain further knowledge on the process of transition to turbulence occurring in the thoracic aorta.
机译:与大量使用基于图像的计算血流动力学来研究在人主动脉中建立的复杂血流并行的同时,对用于验证和标定数字代码的合适实验技术和临时案例的需求也越来越大。研究人员在实验和计算上研究了人类升主动脉的解剖学逼真的幻像中的3D脉动流。实验研究使用3D粒子跟踪测速(PTV)来表征体外流场,而有限体积法则用于在相同条件下,相同条件下以数值方式求解相同域中的运动控制方程。我们的发现表明,在正向流动阶段,计算流场与实测流场之间存在很好的一致性,而在反向流动阶段,流域之间的一致性较差。总而言之,在这里,我们证明3D PTV非常适合对复杂的流体进行详细研究像主动脉中那样的非稳态流动以及用于验证主动脉血流动力学的计算模型。在未来的步骤中,将有可能利用3D PTV的能力来评估速度波动,并因此而获得有关血流动力学过程的进一步知识。向胸主动脉内的湍流过渡。

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