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Stability analyses of flow through an aneurysm: steady and pulsatile flows

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The aim of the present work is to study the changes in flow characteristics as a function of the height and width of a model abdominal aortic aneurysm (AAA) subjected to steady and pulsatile flows. Specifically, we present results from the changes in the distribution of the wall shear stress (WSS) and global stability analyses at different stages of development of an AAA. AAA’s are characterised by a bulge about the vessel centerline [3] which is modeled using a gaussian function, that gradually straightens out to a uniform circular pipe in the upstream and downstream directions. The model configurations considered in the study are characterised by the bulge width W and the bulge height H (height of the bulge above the inlet radius), measured in units of inlet pipe diameter D. The global stability analyses were carried out on axisymmetric base flows on which non-axisymmetric perturbations are allowed to grow. The physical nature of instabilities are examined using an energy-transfer analyses and a qualitative description of the instability mechanisms are outlined.

Author(s):

Shyam Sunder Gopalakrishnan    
Université de Lyon
France

Benoît Pier    
CNRS - Université de Lyon
France

Arie Biesheuvel    
Université de Lyon
France