Aortic aneurysm is one of the 20 most frequent causes of death, with incidence on 1 on 10000 people, approximately. Complications of this pathology are catastrophic, therefore early detection is fundamental in order to treat and reduce lethality. Usually, ascending aortic aneurysm is an asymptomatic pathology, accidentally discovered during image exam of other clinical indication. Investigation of influence due aortic valve s inlet velocity on pressure distribution and wall shear stress on patient s endothelial structure, who did not present significant aneurysm s dilatation over a specific timeframe, may help to identify blood flow patterns which leads to growth of the disease. At this work, numerical simulation was performed with the commercial software Fluent, to determine the flow through computed tomography obtained from patients aortic models. From the results, it was possible to analyze pressure and wall shear stress distributions, which are vital factors for pathology s emergence and development. Furthermore, it was possible to verify that an aortic geometry s slight modification is not enough to force aneurysm dilatation, although it may modify velocity and pressure along blood flow, due to maintenance of pressure and wall shear stress fields.