An Investigation of Pulsatile Blood Flow in An Angulated Neck of Abdominal Aortic Aneurysm Using Computational Fluid Dynamics

Authors

  • Yousif A. Algabri Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Hat Yai 90110, Songkhla, Thailand
  • Surapong Chatpun Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Hat Yai 90110, Songkhla, Thailand
  • Ishkrizat Taib Flow Simulation and Turbulence Focus Group, Faculty of Mechanical and Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, Batu Pahat 86400, Johor, Malaysia

Keywords:

hemodynamics, abdominal aortic aneurysm, CFD, grid independency, velocity distributions

Abstract

Hemodynamics in highly proximal neck of abdominal aortic aneurysm (AAA) was investigated in an idealized case by using computational fluid dynamics (CFD) technique. The steady and pulsatile flow simulations were carried out and compared. The three-dimensional model was constructed using CAD software and boundary conditions were adopted from the literature based on experimental studies. Grid independency study was performed to test the computational mesh used. Blood was considered as incompressible and Newtonian fluid in steady and transient regimes with no-slip and rigid aortic wall. Finite volume method based on ANSYS Fluent was used to solve the CFD governing equations. The results acquired from CFD post-processing for velocity distributions and flow rate during steady and transient (t = 0.25 s and t = 0.55 s) flow states. Furthermore, velocity distributions showed significant differences between the two cases (steady and transient) in the idealized angulated neck AAA model. During the steady state, the flow was concentrated in the middle of aorta while in transient (a systolic phase) the flow was more pronounced and distributed near the wall and tortuous areas more than in a diastolic phase. Flow rate at iliac artery outlets showed different values in both states and slight variance in the right and left iliac arteries. The steady and pulsatile flow comparison using CFD were crucial to understand and investigate the hemodynamic in angulated neck of abdominal aortic aneurysm model.

Published

2020-12-14

How to Cite

A. Algabri, Y. ., Chatpun, S. ., & Taib, I. (2020). An Investigation of Pulsatile Blood Flow in An Angulated Neck of Abdominal Aortic Aneurysm Using Computational Fluid Dynamics. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 57(2), 265–274. Retrieved from https://www.akademiabaru.com/submit/index.php/arfmts/article/view/2557

Issue

Section

Articles