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Optical Coherence Tomography Based Biomechanical Fluid-Structure Interaction Analysis of Coronary Atherosclerosis Progression
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A two-system, single-analysis, fluid-structure interaction technique for modelling abdominal aortic aneurysms.

S C Kelly1, M J O'Rourke

  • 1School of Electrical, Electronic and Mechanical Engineering, University College Dublin, Rm 304, Centre for Material Science and Engineering, Belfield, Dublin, Ireland.

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
|October 7, 2010
PubMed
Summary
This summary is machine-generated.

This study developed a fluid-structure interaction (FSI) method for abdominal aortic aneurysm (AAA) simulations. The FSI technique accurately modeled blood flow and tissue mechanics, providing insights into AAA behavior.

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Area of Science:

  • Biomedical Engineering
  • Computational Fluid Dynamics
  • Medical Device Simulation

Background:

  • Abdominal aortic aneurysms (AAAs) pose significant risks, necessitating advanced simulation techniques for better understanding.
  • Existing computational models often lack comprehensive fluid-structure interaction (FSI) capabilities for AAA analysis.

Purpose of the Study:

  • To implement and validate a novel two-system, single-analysis FSI technique for AAA geometries.
  • To incorporate non-linear material properties of AAA tissue and enable mesh motion in simulations.

Main Methods:

  • Utilized the finite volume (FV) method within the OpenFOAM framework.
  • Implemented fully implicit coupling for robust convergence of fluid and solid domains.
  • Validated fluid and solid components independently against experimental data.

Main Results:

  • Simulations revealed vortex formation at the proximal AAA end during systole, moving distally during diastole.
  • Wall shear stress (WSS) peaked at AAA ends, remaining low centrally.
  • Maximum von Mises stress (408kPa) and displacement (2.31 mm) were observed at the proximal and central regions, respectively.

Conclusions:

  • The validated FSI technique provides a reliable tool for simulating AAA biomechanics.
  • Results align with existing literature, confirming the model's accuracy.
  • This method can aid in predicting AAA rupture risk and guiding treatment strategies.