Analysis of fluid-structure interaction in abdominal aortic aneurysm with high and normal blood pressure

Abstract

In this study, we investigate the behavior of the pulsatile blood flow in an actual Abdominal Aortic Aneurysm derived from the computed tomography (CT) scan images. The human blood is assumed to behave as non-Newtonian fluid. Fluid-structure interaction (FSI) technique was used to predict the displacement and stresses on the wall. The objective of this work is to study the effect of hypertensive blood pressure and the wall shear stress (WSS) since hypertension is reported to be a risk factor in rupture of aneurysms. The numerical prediction shows that the transient behavior of t~c interaction under hypertensive blood pressure IS significantly different from that under normal blood pressure. The peak wall stress, peak WSS and peak deformation occur shortly after systolic peak pressure. The location of maximum WSS is not where the pressure is the highest but rather where the pressure gradient is the largest.