The Influence of Out-of-Plane Geometry on the Flow Within a Distal End-to-Side Anastomosis

[+] Author and Article Information
S. J. Sherwin, O. Shah, D. J. Doorly, J. Peiró, Y. Papaharilaou

Biomedical Flow Group, Aeronautics Department, Imperial College, London, SW7 2BY, United Kingdom

N. Watkins, C. G. Caro

Department of Biological and Medical Systems, Imperial College, London, SW7 2BX, United Kingdom

C. L. Dumoulin

GE Corporate Research and Development, Schenectady, NY 12309

J Biomech Eng 122(1), 86-95 (Jul 21, 1999) (10 pages) doi:10.1115/1.429630 History: Received May 06, 1998; Revised July 21, 1999
Copyright © 2000 by ASME
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Model geometries of distal end of the 45 deg end-to-side anastomosis: (a) planar, (b) nonplanar
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Experimental measurement of the axial flow in a straight pipe at a Reynolds number of Re=390. Also shown is the least-squares fit to a parabolic profile, which is coincident with the theoretical parabolic solution at this Reynolds number.
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Numerical calculation of the normalized wall shear stress in the planar anastomoses model around the bed region using a polynomial order of: (a) p=2, (b) p=4, (c) p=6. The same contour levels have been used in each plot.
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Comparison CFD (top) and MRI (middle) axial velocity, normalized by flow rate per unit are, at (a)0.25D distal to the toe, (b)2D distal to the toe, and (c)5D distal to the toe. Also shown are a comparison of the CFD (dotted line) and MRI (solid line) profile of velocity extracted along the constant z centerline and normalized by mean velocity ū.  
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Comparison CFD (top) and MRI (bottom) crossflow data for the planar model at 0.25D distal to the toe: (a) horizontal v component, (b) vertical w component, (c) crossflow streamlines. All data are normalized by the mean velocity ū.
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Comparison of the CFD normalized axial velocity in planar (top) and nonplanar (bottom): (a) toe, (b)2D distal to the toe, and (c)5D distal to the toe
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Comparison of CFD computed normalized horizontal v-component crossflow velocity in planar (top) and nonplanar (bottom): (a) toe, (b)2D distal to the toe, and (c)5D distal to the toe
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Comparison of CFD normalized computed vertical w-component crossflow velocity in planar (top) and nonplanar (bottom): (a) toe, (b)2D distal to the toe, and (c)5D distal to the toe
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Comparison of the normalized axial velocity at the heel of the anastomosis for: (a) planar, (b) nonplanar geometries
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Comparison of CFD computed wall shear stress normalized by the steady straight pipe wall shear stress for: (a) planar, (b) nonplanar geometries
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Comparison of CFD pressure coefficients along the wall for: (a) planar, (b) nonplanar geometries



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