颈动脉分叉个体实例模型的数值模拟(王青; 王炜哲; 费智敏; 刘应征; 曹兆敏)

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me5US!oB9L)e;H n0【作者】王青; 王炜哲; 费智敏; 刘应征; 曹兆敏 【作者单位】上海交通大学机械与动力工程学院; 上海交通大学医学院附属仁济医院水利论文Q^o)J2r2h.f8Xa F

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[3qq6r-dy.AP0【论文摘要】 颈动脉分叉处是动脉粥样硬化的多发部位。大量研究表明,动脉粥样硬化的发生与该处的血液动力学特性密切相关。而研究个体化的颈动脉分叉模型可以帮助获得个体更为真实的颈动脉血液流动细节。本研究通过对 CT 医学影像的三维重建,获得人体个体化真实颈动脉分叉模型,并且利用计算流体力学(CFD)的研究方法进行数值模拟,分析个体化模型的血液动力学特性。结果表明:在一个心动周期内,此个体化颈动脉分叉模型在颈动脉窦和外颈动脉分叉入口外壁附近血液流动发生流动分离,产生旋涡等复杂流动.这些区域的外壁面的壁面切应力较低,并随入口速度的脉动而振荡,这些特征的产生与颈动脉几何形态密切相关.

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5e;V b ?*t Wb0【英文论文摘要】 Carotid artery bifurcation atherosclerosis is one of the sites atherosclerosis(AS)occurs preferably.Many discoveries show that AS has close relationship with the local hemodynamic characteristics of the cardiovascular.Study on an individual carotid artery model can obtain more realistic flow details.In this paper,we used CT image to obtain an individual three-dimensional reconstructed model of the carotid artery bifurcation.Then do numerical simulation with CFD method to analyze the flow details of this model.Results demonstrate:flow separations occur in the carotid sinus and the region near the outer wall of the ECA.The blood speed is low with backflow and vortex generating in those regions.Shear stress in those areas is relatively lower and is oscillating. Those characteristics is close related to the geometry of the carotid artery

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dEoD:Ca b0【论文关键词】 颈动脉分叉; 血液动力学; 计算流体力学; 动脉粥样硬化水利论文:AGbk1xAC
【英文论文关键词】 Carotid artery bifurcation; Hemodynamic; CFD; Atherosclerosis

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