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TECHNICAL PAPERS: Fluids/Heat/Transport

3-D Numerical Simulation of Blood Flow Through Models of the Human Aorta

[+] Author and Article Information
L. Morris, A. Callanan, M. Walsh

Centre for Applied Biomedical Engineering Research, Dept. Mechanical & Aeronautical Eng. and Material and Surface Science Institute,  University of Limerick, Castletroy, Limerick, Ireland

P. Delassus

Dept. Mechanical & Industrial Eng.,  Galway & Mayo Institute of Technology, Galway, Ireland

F. Wallis, P. Grace

 MidWestern Regional Hospital, Dooradoyle, Limerick, Ireland

T. McGloughlin

Centre for Applied Biomedical Engineering Research, Dept. Mechanical & Aeronautical Eng. and Material and Surface Science Institute,  University of Limerick, Castletroy, Limerick, IrelandTim.Mcgloughlin@ul.ie

J Biomech Eng 127(5), 767-775 (May 31, 2005) (9 pages) doi:10.1115/1.1992521 History: Received August 27, 2003; Revised May 04, 2005; Accepted May 31, 2005

A Spiral Computerized Tomography (CT) scan of the aorta were obtained from a single subject and three model variations were examined. Computational fluid dynamics modeling of all three models showed variations in the velocity contours along the aortic arch with differences in the boundary layer growth and recirculation regions. Further downstream, all three models showed very similar velocity profiles during maximum velocity with differences occurring in the decelerating part of the pulse. Flow patterns obtained from transient 3-D computational fluid dynamics are influenced by different reconstruction methods and the pulsatility of the flow. Caution is required when analyzing models based on CT scans.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

(a) 2 D contour smoothing based on nonparametric smoothing methods. (b) Axial smoothing of the centroids in x direction.

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Figure 2

Aortic arch reconstructions. Model 1: CT scan model with no axial or area smoothing. Model 2: Axial and area smoothed model. Model 3: All cross sections are assumed circular with axial and area smoothing.

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Figure 3

Inputted ascending aorta velocity pulse with its corresponding 10 harmonic Fourier series

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Figure 4

(a) Pave mesh across inlet. (b) Swept Cooper scheme throughout volume. (Lower mesh density is shown to ease visualization.)

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Figure 5

Axial velocity plots for the maximum velocity and wall shear stress along the inner wall for different density meshes showing grid independence

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Figure 6

(a) Radius of Lumen along arch. (b) Radius of curvature. (c) Relationship between r∕R. (d) Dean number.

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Figure 7

The sections of interest that describes the flow throughout the models

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Figure 8

The axial velocity profiles for each model at the selected section from left to right as given in Fig. 4. T1 is the time step for maximum acceleration. T2 is for maximum velocity. T3 is for maximum deceleration and T4 is for minimum velocity. The position of these time steps are given in Fig. 3.

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Figure 9

Comparison between a time averaged steady flow solution with its corresponding time average velocity for the accelerating and decelerating part of the pulse for model 2

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Figure 10

(a) Inner wall shear stress. (b) Outer wall shear stress.

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