CFD Investigation of the Effect of Cerebral Aneurysms Size on Wall Stresses and Strain

摘要

In this study, an idealized terminal-type cerebral aneurysm is investigated using numerical one-way fluid-solid interactions technique. The study reports the effect of the aneurysm aspect ratio (AR) on wall shear stress (WSS), circumferential wall stresses and stagnant area ratio (SAR). The results show that as the aspect ratio increases, the wall shear stress decreases while circumferential wall stress increases. The clinical needs to assess the severity of an aneurysm based on aspect ratio is explored in this study. A linear equation has been formed which relates the aneurysm wall stresses and deformation to the aneurysm's aspect ratio which is a novel technique to evaluate the severity of aneurysm size. The stagnant area ratio (SAR) is investigated against aneurysm aspect ratio to predict the formation of thrombosis and the likely size of the thrombus.