Non-axisymmetric Flow Development in Pulsatile Blood Flow through an Aneurysm

Jamison, R. A., Sheard, G. J. and Ryan, K. (2007). Non-axisymmetric Flow Development in Pulsatile Blood Flow through an Aneurysm. In: Peter Jacobs, Tim McIntyre, Matthew Cleary, David Buttsworth, David Mee, Rose Clements, Richard Morgan and Charles Lemckert, 16th Australasian Fluid Mechanics Conference (AFMC). 16th Australasian Fluid Mechanics Conference (AFMC), Gold Coast, Queensland, Australia, (353-360). 3-7 December, 2007.

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Author Jamison, R. A.
Sheard, G. J.
Ryan, K.
Title of paper Non-axisymmetric Flow Development in Pulsatile Blood Flow through an Aneurysm
Conference name 16th Australasian Fluid Mechanics Conference (AFMC)
Conference location Gold Coast, Queensland, Australia
Conference dates 3-7 December, 2007
Proceedings title 16th Australasian Fluid Mechanics Conference (AFMC)
Place of Publication Brisbane, Australia
Publisher School of Engineering, The University of Queensland
Publication Year 2007
Year available 2007
Sub-type Fully published paper
ISBN 978-1-864998-94-8
Editor Peter Jacobs
Tim McIntyre
Matthew Cleary
David Buttsworth
David Mee
Rose Clements
Richard Morgan
Charles Lemckert
Start page 353
End page 360
Total pages 8
Collection year 2007
Language eng
Abstract/Summary Computational fluid dynamics modelling of an abdominal aortic aneurysm is commonly simplified to consider a two-dimensional axisymmetric problem. To determine the validity of this assumption, a Floquet stability analysis was employed to predict the conditions under which an axisymmetric aneurysmal flow is unstable to non-axisymmetric instabilities. Dimensions of the model were selected to be consistent with a high-risk aneurysm in the human abdominal aorta. In particular, the model consisted of an elliptical bulge defining the aneurysm, and both upstream and downstream artery sections. A sinusoidal time-varying parabolic velocity profile was input upstream, with Womersley number α = 16.9 (representing a heart rate of 70 beats per minute when artery diameter D = 22.7 mm and kinematic viscosity v = 3.3x10-6 m2 / s). A Reynolds number range relevant to aneurysms in large arteries was examined, with the critical Reynolds number for non-axisymmetric transition and the corresponding azimuthal wavelength found to be ReCRIT = 610 and λ = π (azimuthal mode number m = 2). The maximum vorticity at the vessel wall was found to occur at the distal end of the aneurysm bulge. The pulsatile flow frequency was also varied, with the frequency dependence on ReCRIT and λ being established.
Subjects 290501 Mechanical Engineering
291500 Biomedical Engineering
Keyword Aneurysm
computational fluid dynamics
Floquet
three-dimensional transition
non-axisymmetric
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Conference Paper
Collection: 16th Australasian Fluid Mechanics Conference
 
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Created: Wed, 19 Dec 2007, 09:40:13 EST by Laura McTaggart on behalf of School of Engineering