不对称入口速度剖面对颈动脉分叉模型不定常流场和壁面切应力的影响

目的研究不对称入口速度剖面对动脉粥样硬化易发部位壁面切应力的影响。方法建立颈动脉TF-AHCB数值模型,设置不对称速度剖面入口条件,用CFD作数值模拟。计算不同时相、不同入口条件下的颈动脉窦流场和壁面切应力分布,分析与动脉粥样硬化有关的流场特征和切应力特征。结果入口速度剖面偏斜可以增加颈动脉窦壁面低切应力区面积,提高切应力梯度。结论不对称入口速度剖面可能是诱发动脉粥样硬化发生的一个危险因子。

Numerical simulation of the effect of asymmetric inlet velocity on unsteady flow field and wall shear stress in TF-AHCB model

Objective To study the effect of asymmetric inlet velocity profile on the wall shear stress of the position where atherosclerosis always happens.Methods Special software is used to construct the TF-AHCB model,set the asymmetric inlet velocity profile,and do the mesh dividing and the simulation work.The flow field of sinus and the distribution of wall shear stress on the different conditions of time and inlet velocity are calculated.The feature of flow field and shear stress which is related to the atherosclerosis is analyzed.Result Asymmetric inlet velocity profile deflexion could increase the area of low shear stress and the gradient of shear stress.Conclusion Asymmetric inlet velocity profile could be one of the dangerous factor to cause atherosclerosis.