Fig. 1

The study flowchart and methods for investigating hemodynamics for AAA rupture. Three-dimensional (3D) segmentation produced using finite element analysis on the CT image of an AAA. (A) Geometry Segmentation. The yellow part is the AAA, the blue part is the blood; (B) 3D Segmentation Produced. Using 3-MATIC software smooth aneurysm model; (C) Morphological Measurement. Using MIMICS software measure AAA. Aortic Neck Length (ANL) = The length of the abdominal aortic aneurysm centerline from the plane of the renal artery to the plane of the enlarged segment of the abdominal aortic aneurysm. AAA α = The flow axis of the suprarenal aorta and the infrarenal neck; AAA β = The flow axis of the infrarenal neck and the body of the aneurysm; Tortuosity = One minus (the straight-line distance from the neck to the bifurcation of the iliac artery divided by the distance along the centerline); (D) Mesh Generation. Use ANSYS software to mesh the model and set entrance and exit conditions; (E) Applying Boundary Conditions. Navier Stokes equation. Set dynamic boundary conditions and set the governing equation of the fluid domain to the Navier-Stokes equation; (F) CFD Results of AAA. The left picture shows the fluid part results, and the right picture shows the fluid-structure coupling results. AAA = Abdominal Aortic Aneurysm. Figure created using Microsoft PowerPoint 2019 (Home and Student Edition) (https://www.microsoft.com/) and Microsoft Visio Professional 2019 (https://www.microsoft.com/).