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The effect of flow recirculation on abdominal aortic aneurysm

Taib I., Ishkrizat and Amirnordin, Shahrin Hisham and Madon, Rais Hanizam and Mustafa, Norrizal (2012) The effect of flow recirculation on abdominal aortic aneurysm. AIP Conference Proceedings, 1440 . pp. 130-135. ISSN 0094-243X

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Official URL: http://dx.doi.org/10.1063/1.4704211

Abstract

The presences of flow recirculation at the abdominal aortic aneurysm (AAA) region yield the unpredictable failure of aneurismal wall. The failure of the aneurismal wall is closely related to the hemodynamic factor. Hemodynamic factor such as pressure and velocity distribution play a significance role of aneurysm growth and rupture. By using the computational approach, the influence of hemodynamic factor is investigated using computational fluid dynamic (CFD) method on the virtual AAA model. The virtual 3D AAAs model was reconstructed from Spiral Computed Tomography scan (CT-scan). The blood flow is assumed as being transient, laminar and Newtonian within a rigid section of the vessel. The blood flow also driven by an imposed of pressure gradient in the form of physiological waveform. The pulsating blood flow is also considered in this simulation. The results on pressure distribution and velocity profile are analyzed to interpret the behaviour of flow recirculation. The results show the forming of vortices is seen at the aneurysm bulge. This vortices is form at the aneurysm region then destroyed rapidly by flow recirculation. Flow recirculation is point out much higher at distal end of aneurysm closed to iliac bifurcation. This phenomenon is managed to increase the possibility of aneurysm growth and rupture.

Item Type:Article
Uncontrolled Keywords:abdominal aortic aneurysm (AAA), flow recirculation, hemodynamic, pulsating flow
Subjects:T Technology > TJ Mechanical engineering and machinery
Divisions:Mechanical Engineering
ID Code:47606
Deposited By: Narimah Nawil
Deposited On:22 Jun 2015 05:56
Last Modified:05 Mar 2019 02:09

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