An aneurysm is a permanent balloon-like, blood-filled dilatation on an arterial vessel. In an abdominal aortic aneurysm (AAA), the growth and eventual rupture of aneurysmal lesions depends on the interaction between the aneurysm wall and the blood motion along it. Rupture of an aneurysm occurs when the shear stresses exceed the strength of the wall [1]. When an AAA ruptures, 50 percent of patients die before reaching the operating room and 54 percent of the remaining will die within 30 days [2]. Therefore, AAA represents a great danger to the patient [3]. The objective of this study is to investigate the shear stresses in an aneurysm composed by two deforned regions and to examine the effect of the blood non-Newtonian behavior on the flow dynamics.

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