The Aneurysm is an expansion or distension of the wall of a blood vessel, however, this study is based on the abdominal aorta, a segment of the aorta that gives rise to the celiac trunk that divides into gastric arteries, liver and spleen. We designed physical model with the software Solidwokes. This software has allowed us to visualize the Abdominal Aortic Aneurysm, we have noticed an increase in the diameter of the aorta where less than 50% aver the normal aorta. The mathematical models of blood flow in the abdominal aorta aneurismed were made based on the exploitation of Navier Stokes equations, for the finite difference method and that of the law of conservation of momentum. These math modes show that in the Abdominal Aortic Aneurysm it has increase the upstream pressure of blood and decrease downstream.