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Finite element analysis in three-dimensional flow through a lateral saccular aneurysm
1Center for Information Science, Japan Advanced Institute of Science and Technology, Ishikawa.
Frontiers of Medical and Biological Engineering : the International Journal of the Japan Society of Medical Electronics and Biological Engineering
|January 1, 1993
Summary
Computational fluid dynamics revealed complex flow patterns within saccular aneurysms. These intricate blood flow dynamics, including separation vortices, may contribute to thrombus formation and aneurysm rupture.
Area of Science:
- Biomedical Engineering
- Computational Fluid Dynamics
- Medical Physics
Background:
- Saccular aneurysms present complex three-dimensional flow dynamics.
- Understanding these hemodynamics is crucial for predicting aneurysm progression and rupture.
- Previous studies have utilized various methods to model blood flow in aneurysms.
Purpose of the Study:
- To investigate the three-dimensional flow patterns in a lateral saccular aneurysm model.
- To analyze the impact of aneurysm geometry on blood flow characteristics.
- To correlate flow disturbances with potential pathological outcomes like thrombus formation and rupture.
Main Methods:
- Finite element method (FEM) applied to a saccular aneurysm model.
- Steady Navier-Stokes and continuity equations solved using Galerkin process.
- Quadratic velocity and linear pressure approximations within hexahedral elements.
- Newton-Raphson method employed for solving non-linear finite element equations.
Main Results:
- A separation vortex was observed throughout the aneurysm's circumferential region at Reynolds number 1000.
- The aneurysm's geometry significantly distorted the primary separation vortex.
- Two additional vortices formed at the proximal and distal walls, induced by the main separation vortex.
Conclusions:
- The study elucidates complex hemodynamic disturbances within saccular aneurysms.
- These flow alterations, characterized by vortex formation, are implicated in thrombus development.
- Disturbed blood flow is a significant factor in the pathogenesis of aneurysm rupture.