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TECHNICAL PAPERS: Fluids/Heat/Transport

Two-equation Turbulence Modeling of Pulsatile Flow in a Stenosed Tube

[+] Author and Article Information
J. Ryval, A. G. Straatman

The Department of Mechanical & Materials Engineering, The University of Western Ontario, London, Ontario, Canada, N6A 5B9

D. A. Steinman

Imaging Research Laboratories, Robarts Research Institute, London, Ontario, Canada, N6A 5K8; The Department of Medical Biophysics, The University of Western Ontario, London, Ontario, Canada, N6A 5B9

J Biomech Eng 126(5), 625-635 (Nov 23, 2004) (11 pages) doi:10.1115/1.1798055 History: Received February 03, 2004; Revised June 03, 2004; Online November 23, 2004
Copyright © 2004 by ASME
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References

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Figures

Grahic Jump Location
Stenosed geometry with a 75% area reduction from Ahmed and Giddens 6
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Recirculation lengths as a function of Reynolds number in the 75% area reduction stenosis model under steady conditions. Zr is measured from the throat of the stenosis and normalized by the diameter of the tube D.
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Velocity profiles at selected locations in the 75% stenosis model at ReD=500 under steady conditions. Symbols are data from the experiments of Ahmed and Giddens 6. The locations are as indicated, where Z is the distance from the throat normalized by the diameter of the tube D.
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Velocity profiles at selected locations in the 75% stenosis model at ReD=1000 under steady conditions. Symbols are data from Ahmed and Giddens 7.
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Centerline turbulence intensity in the 75% stenosis model under steady conditions; (a) ReD=500, (b) ReD=1000. Symbols are data from Ahmed and Giddens 7.
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Turbulence intensity profiles in the 75% stenosis model at ReD=1000 under steady conditions (from left to right Z=2.5, 4.0, and 6.0). Symbols are data from Ahmed and Giddens 7.
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Comparison of inlet pulses between experiments and numerical simulations. (a) Simulations compared to the experiments of Ahmed and Giddens 8 (75% stenosis), (b) Simulations compared to the experiments of Lieber and Giddens 9 (75% and 90% stenoses).
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Centerline velocity at stations in the tube over one pulse cycle showing the existence of turbulence, (a) LG75, standard k-ω, (b) LG75, Tk-ω, (c) LG90, standard k-ω, (d) LG90, Tk-ω, (e) AG75, standard k-ω, and (f ) AG75, Tk-ω.
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Centerline velocity at the peak of the imposed pulse in the 75% stenosis model (AG75). The experimental data are from Ahmed and Giddens 8.
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Average turbulence intensity in the 75% stenosis model (AG75) during the time intervals: (a) acceleration phase, (b) peak phase, and (c) deceleration phase. The experimental data are from Ahmed 10.
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Velocity profiles at the peak of the imposed pulse in the 75% stenosis model (AG75). The experimental data are from Ahmed and Giddens 8.
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Velocity profiles at four instants in the imposed pulse cycle in the 75% stenosis model (AG75) at: (a) Z=1.0, (b) Z=4.0. The experimental data are from Ahmed and Giddens 8.
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Turbulence intensity profiles in the 75% stenosis model (AG75) for (a) acceleration interval and (b) peak interval. The experimental data are from Ahmed 10.

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