Blood Flow Simulation in Descending Thoracic Aorta and the Effect of Geometry and Pathology on Flow Behavior

Nowadays, the importance of detecting reasons for pathology of blood vessel and their removal is increasing. One of the best solutions which can be brought up is CFD blood flow simulation for human in vivo condition. This study concerns blood flow simulation in descending thoracic aorta as comparative investigation to find the effect of the geometry and conditions (i.e., aneurysm and atherosclerosis) on flow behavior, without and with considering non-linear isotropic elastic vessel wall. In this analysis, laminar transient flow is used for simulation according to the time variant velocity and pressure value in boundary conditions. Carreau_Yasuda non-Newtonian rheology is used as the blood property to find its effect as the shear stress on the vessels wall. Finally, results showed the effect of the geometry and pulsatile flow on formation of vortex flow in different regions of the vessel as well as their effects on flow stagnation which can be led to plaque accumulation and diseases. The distribution of wall shear stresses (WSS) and their maximum and minimum regions also showed the importance of this parameter on rapture and diseases incidence in those regions. Keywords: Blood; Flow; Pulsatile; Simulation; Aneurysm; Atherosclerosis; Thoracic; Iliac; Renal