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A fluid mechanical view on abdominal aortic aneurysms

Published online by Cambridge University Press:  29 November 2010

VIRGINIE DUCLAUX ,
FRANÇOIS GALLAIRE  and
CHRISTOPHE CLANET
VIRGINIE DUCLAUX
Affiliation:
IRPHE, UMR 6594, 49 rue F. Joliot-Curie, 13384 Marseille, France
FRANÇOIS GALLAIRE
Affiliation:
LFMI, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
CHRISTOPHE CLANET*
Affiliation:
LadHyX, UMR 7646, Ecole Polytechnique, 91178 Palaiseau, France
*
†Email address for correspondence: clanet@ladhyx.polytechnique.fr
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Abstract

Abdominal aortic aneurysms are a dilatation of the aorta, localized preferentially above the bifurcation of the iliac arteries, which increases in time. Understanding their localization and growth rate remain two open questions that can have either a biological or a physical origin. In order to identify the respective role of biological and physical processes, we address in this article these questions of the localization and growth using a simplified physical experiment in which water (blood) is pumped periodically (amplitude a, pulsation ω) in an elastic membrane (aorta) (length L, cross-section A0 and elastic wave speed c0) and study the deformation of this membrane while decharging in a rigid tube (iliac artery; hydraulic loss K). We first show that this pulsed flow either leads to a homogenous deformation or inhomogenous deformation depending on the value of the non-dimensional parameter c02/(aLω2K). These different regimes can be related to the aneurysm locations. In the second part, we study the growth of aneurysms and show that they only develop above a critical flow rate which scales as A0c0/.

JFM classification

Biological Fluid Dynamics: Biomedical flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 664 , 10 December 2010 , pp. 5 - 32
Copyright
Copyright © Cambridge University Press 2010

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