关键词: 颅内动脉瘤, 血液动力学, 破裂, 数值模拟

Abstract: Hemodynamics of intracranial lateral aneurysms was simulated numerically. The blood was considered as Newtonian fluid and the elasticity of the wall was neglected. Three-dimension N-S equations were solved by using artificial compressibility algorithm. The influence of aneurysmal geometry shape and Reynolds number on hemodynamic factors, such as shear stress on the wall, pressure were calculated in the static and pulsatile conditions. The main results were that the greater depth of intracranial aneurysm, the greater distal shear stress is in which the aneurysm grow up and rupture for the intracranial aneurysms in the early stage in both static and pulsatile conditions; the pulsatile make the variety of distal shear stress with space and time more violent and easier rupture. The distal shear stress of aneurysm increases while the arterial diameter decrease and the velocity keep constant. It shows that the intracranial aneurysm is easier grow in small artery than that in the bigger blood tube. This result is consistent with physiology.

Key words: intracranial aneurysm, hemodynamics, rupture, numerical simulation