Journal of Engineering Mathematics

, Volume 64, Issue 4, pp 379–390 | Cite as

Flow dynamics and wall shear-stress variation in a fusiform aneurysm

Article

Abstract

Pulsatile flow through a tube featuring a sinusoidal bulge is computed in order to determine the flow dynamics and wall shear-stress conditions encountered under conditions representative of blood flow through a human abdominal aortic aneurysm. A high-order spectral-element algorithm is employed to accurately determine velocity and vorticity fields, plus wall shear stresses, which are notoriously difficult to measure experimentally. A greater level of detail in the flow is revealed when compared to recent particle image velocimetry experiments. For both the mean and standard deviation of wall shear stress, minimum levels are found at the widest point of the aneurysm bulge, and maximum levels are recorded in the distal (downstream) region of the bulge. In an aneurysm with length and maximum diameter 2.9 and 1.9 times the artery diameter, respectively, peak instantaneous wall shear stress is 2.4 times greater than the peak wall shear stress recorded in a healthy vessel.

Keywords

Aneurysm Blood flow Computational fluid dynamics Direct numerical simulation Spectral-element method Wall shear stress 

Abbreviation

WSS

Wall shear stress

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Division of Biological Engineering, Faculty of EngineeringMonash UniversityClaytonAustralia
  2. 2.Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical and Aerospace EngineeringMonash UniversityClaytonAustralia

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