腹主动脉瘤中定常流动的三维数值模拟

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

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。

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.