Abstract
Numerical simulation for blood flows in cerebral vessels with aneurysm and laboratory experiments using a particle image velocimetry (PIV) are carried out to identify risk factors of aneursym rupture. The results of numerical simulation in three simplified models of a terminal aneurysm of the basilar artery show that the wall shear stress is higher at the bleb's neck than that around the aneurysm's neck and low-wall-shear stress area extends as an aneurysm's aspect ratio increases from 1.2 to 2.0. The PIV measurements of the flow in realistic aneurysm models are also conducted.
