腹主动脉瘤中定常流动的三维数值模拟

目的讨论定常流动情况下，三维腹主动脉瘤模型内的流动情况。方法应用三维非对称模型进行数值模拟。结果结果表明，在对称面上有一个涡而横截面上有两对涡的存在。壁面切应力在动脉瘤的出口处数值较高且变化大。结论流动和壁面切应力分布反应动脉瘤出口处为破裂的危险区域。

THREE-DIMENSIONAL NUMERICAL SIMULATION OF STEADY FLOW IN ABDOMINAL AORTIC ANEURYSM MODELS

Objective This study reveals steady flow characteristics in rigid asymmetrical AAA models. Methods Three-dimensional symmetrical models are used to numerically simulate the steady flow in the AAA models. Results The results show that the main vortex are found in the x-z plane and two pairs of symmetrical vortices are found in the cross-section plane. Regions of high wall shear stress were observed at the distal end of the aneurysm and the wall shear stresses change dramatically at the same place, especially the z component.Conclusion The distal end of the aneurysm becomes thus the most vulnerable region in the rupture of the aneurysm.