人颈动脉分叉模型流场分布的数值模拟

Numerical simulation of flow fields in carotid artery bifurcation model

目的实现不同流速下人颈动脉分叉模型中流场分布的数值模拟。方法依据实验应用的人颈动脉分叉模型,采用Gambit软件建立了数值模拟应用的颈动脉分叉几何模型。应用FLUENT6.0软件分别计算不同流速下颈动脉分叉模型内血管壁面切应力分布。结果在人颈动脉分叉模型内的颈总动脉区域,无论流速如何改变,其切应力分布大致均匀。颈内动脉窦(internal carotid artery sinus,ICAS)的外侧壁存在明显的低切应力区域,并且随着流速的增加,低切应力区域的范围明显减小。结论低血管壁面剪切应力是动脉粥样硬化发生的危险性血流动力学因素。

Objective To simulate local hemodynamic distribution at particular arterial positions. Methods According to the model used, a geometric model of carotid artery bifurcation was constructed with Gambit software. Wall shear stress distribution at different flow rate in the carotid artery model was analyzed by numerical simulation. Results In common carotid artery areas, the wall shear stress distribution was almost even at different flow rate, but in internal carotid artery sinus areas, there existed special low wall shear scopes. The higher the flow rate was, the smaller the areas of low wall shear stress were. Conclusion Low wall shear stress is a high risk hemodynamic factor in the development of atherosclerosis.