Abdominal aortic aneurysms (AAA) are characterized by disturbed flow patterns, low and oscillatory wall shear stress with high gradients, increased particle residence time, and mild turbulence. Diameter is the most common metric for rupture prediction, although this metric can be unreliable. We hypothesize that understanding the flow topology and mixing inside AAA could provide useful insight into mechanisms of aneurysm growth. AAA morphology has high variability, as with AAA hemodynamics, and therefore we consider patient-specific analyses over several small to medium sized AAAs. Vortical patterns dominate AAA hemodynamics and traditional analyses based on the Eulerian fields (e.g. velocity) fail to convey the complex flow structures. The computation of finite-time Lyapunov exponent (FTLE) fields and underlying Lagrangian coherent structures (LCS) help reveal a Lagrangian template for quantifying the flow [1].
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ASME 2012 Summer Bioengineering Conference
June 20–23, 2012
Fajardo, Puerto Rico, USA
Conference Sponsors:
- Bioengineering Division
ISBN:
978-0-7918-4480-9
PROCEEDINGS PAPER
Transport and Mixing in Patient Specific Abdominal Aortic Aneurysms With Lagrangian Coherent Structures
Amirhossein Arzani,
Amirhossein Arzani
Illinois Institute of Technology, Chicago, IL
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Shawn C. Shadden
Shawn C. Shadden
Illinois Institute of Technology, Chicago, IL
Search for other works by this author on:
Amirhossein Arzani
Illinois Institute of Technology, Chicago, IL
Shawn C. Shadden
Illinois Institute of Technology, Chicago, IL
Paper No:
SBC2012-80475, pp. 9-10; 2 pages
Published Online:
July 19, 2013
Citation
Arzani, A, & Shadden, SC. "Transport and Mixing in Patient Specific Abdominal Aortic Aneurysms With Lagrangian Coherent Structures." Proceedings of the ASME 2012 Summer Bioengineering Conference. ASME 2012 Summer Bioengineering Conference, Parts A and B. Fajardo, Puerto Rico, USA. June 20–23, 2012. pp. 9-10. ASME. https://doi.org/10.1115/SBC2012-80475
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