Flow-induced Wall Shear Stress in Abdominal Aortic Aneurysms: Part I - Steady Flow Hemodynamics

Numerical predictions of blood flow patterns and hemodynamic stresses in Abdominal Aortic Aneurysms (AAAs) are performed in a two-aneurysm, axisymmetric, rigid wall model using the spectral element method. Homogeneous, Newtonian blood flow is simulated under steady conditions for the range of Reynol...

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Bibliographic Details
Published in:Computer methods in biomechanics and biomedical engineering 2002, Vol.5 (4), p.309-318
Main Authors: Finol, Ender A., Amon, Cristina H.
Format: Article
Language:English
Subjects:
Aneurysms
Aorta, Abdominal - physiopathology
Aortic Aneurysm, Abdominal - physiopathology
Blood Flow Velocity
Blood Pressure
Computer Simulation
Elasticity
Hemodynamics
Humans
Models, Cardiovascular
Sensitivity and Specificity
Shear Stress
Statistics as Topic
Steady Flow
Stress, Mechanical
Wall Shear Stress Gradient
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Summary:Numerical predictions of blood flow patterns and hemodynamic stresses in Abdominal Aortic Aneurysms (AAAs) are performed in a two-aneurysm, axisymmetric, rigid wall model using the spectral element method. Homogeneous, Newtonian blood flow is simulated under steady conditions for the range of Reynolds numbers 10 h Re h 2265. Flow hemodynamics are quantified by calculating the distributions of wall pressure (p w ), wall shear stress ( w ), Wall Shear Stress Gradient (WSSG). A correlation between maximum values of hemodynamic stresses and Reynolds number is established, and the spatial distribution of WSSG is considered as a hemodynamic force that may cause damage to the arterial wall at an intermediate stage of AAA growth. The temporal distribution of hemodynamic stresses in pulsatile flow and their physical implications in AAA rupture are discussed in Part II of this paper.
ISSN:1025-5842
1476-8259
DOI:10.1080/1025584021000009742