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Steady and Transient Flow CFD Simulations in an Aorta Model of Normal and Aortic Aneurysm Subjects

机译:正常与主动脉瘤科目主动脉模型中稳态和瞬态流动速率模拟

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The CFD models of aorta of normal subject and patient-specific aortic aneurysm were developed. The steady and transient analyses were carried out to compare the blood flow patterns of the models. The Newtonian blood model was used for steady-state analysis, and non-Newtonian blood model was assumed for transient-state analysis. The haemodynamic parameters like wall pressure, wall shear stress and velocity distribution were estimated from the models. It is found from the results that the flow in the patient-specific aneurysmal model was unstable. The abnormal high and low WSS occurred in the aneurysm cavity during deceleration phase of flow. It may cause rupture of aneurysm. It is observed from the results of steady-state analysis that all the measured haemodynamic parameters from aneurysmal aorta model were higher than those obtained from the aorta model of normal subject. This high magnitude of these parameters may lead to severe problem to the aneurysmal patient. These measured parameters could help the surgeons in assessing the severity of aortic aneurysms Furthermore, the usage of gold nanoparticles as a contrast agent is the emerging new sort of approach to obtain CT images of aneurysm. This may help in the prediction of rupture of aneurysm.
机译:开发了正常主题和患者特异性主动脉瘤的主动脉的CFD模型。进行稳定和瞬态分析以比较模型的血流模式。牛顿血液模型用于稳态分析,并且假设非牛顿血液模型用于瞬态分析。从模型中估计了墙体压力,壁剪切应力和速度分布等血管动力学参数。从结果中发现了患者特异性动脉瘤模型的流动不稳定。在流动的减速阶段期间,在动脉瘤腔中发生异常的高和低WSS。它可能导致动脉瘤破裂。从稳态分析结果观察到来自动脉瘤主动脉模型的所有测量的血流动力学参数高于来自正常对象的主动脉模型的测量血流动力学参数。这些参数的这种高度可能导致动脉瘤患者的严重问题。这些测量的参数可以帮助外科医生评估主动脉动脉瘤的严重程度,此外,作为造影剂的使用金纳米粒子是获得动脉瘤的CT图像的新出现的新方法。这可能有助于预测动脉瘤破裂。

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