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TECHNICAL PAPERS

Application of Large-Eddy Simulation to the Study of Pulsatile Flow in a Modeled Arterial Stenosis

[+] Author and Article Information
R. Mittal, S. P. Simmons

Department of Mechanical Engineering, University of Florida, Gainesville, FL 32611

H. S. Udaykumar

Department of Mechanical Engineering, University of Iowa, Iowa City, IA 52242

J Biomech Eng 123(4), 325-332 (Mar 26, 2001) (8 pages) doi:10.1115/1.1385840 History: Received October 22, 2000; Revised March 26, 2001
Copyright © 2001 by ASME
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References

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Figures

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Schematic of the stenosis model employed in the current simulations
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Two-dimensional view of the mesh in the vicinity of the stenosis. Only every second grid point in the x1 and every fourth point in the x2 direction is shown.
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Comparison of mean velocity profiles obtained from two different simulations. The solid and dotted lines correspond to 240×64×16 and 240×96×16 meshes, respectively. The solid circles indicate locations where temporal variation of flow variable is extracted for frequency analysis.
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Sequence of four spanwise-averaged, spanwise vorticity plots over one flow cycle for the Re=2000,St0=0.024 case. Dark and light shades represent clockwise and counterclockwise vorticity, respectively. (a) t/T=0, (b) t/T=0.25, (c) t/T=0.5, (d) t/T=0.75.
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Three-dimensional isosurface plot of spanwise vorticity corresponding to Fig. 4(c)
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Mean flow characteristics obtained by averaging in time and along the spanwise direction: (a) streamline plot; (b) contour plot of pressure
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Nondimensionalized shear stress and pressure on the lower and upper walls of the channel: (a) skin friction coefficient Cf; (b) pressure coefficient Cp
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Root mean square (rms) shear stress and pressure gradient on the lower and upper walls of the channel: (a) root mean square skin friction coefficient (Cf)rms; (b) root-mean-square pressure gradient (pτ)rms
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(a) Temporal variation of streamwise velocity (u1) over one cycle at various locations on the channel centerline. The locations have been indicated by solid circles in Fig. 3. The plots have been offset in the vertical direction. (i) x/H=4.5;offset=0; (ii) x/H=6.1;offset=+2; (iii) x/H=9.1;offset=+6; (iv) x/H=12.3;offset=+8. (b) plot of velocity variation, its phase average (ũ1) and deviation from phase average (u1) at x/H=6.1. (c) Frequency spectra of (u1) corresponding to the variations in Fig. 9. The spectra have been offset by a factor in the vertical direction. (i) x/H=4.5;offset=×1; (ii) x/H=6.1;offset=×10; (iii) x/H=9.1;offset=×100; (iv) x/H=12.3;offset=×2000. Vertical line in the spectra indicates the Strouhal number(=0.94) of the high-frequency vortex shedding.
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(a) Temporal variation of pressure coefficient over one cycle at various streamwise locations on the lower wall at streamline locations corresponding to previous plot. The plots have been offset in the vertical direction. (i) x/H=4.5;offset=0; (ii) x/H=6.1;offset=+4; (iii) x/H=9.1;offset=+8; (iv) x/H=12.3;offset=+12. (b) Frequency spectra of p corresponding to the pressure variations in Fig. 10(a). The spectra have been offset by a factor in the vertical direction. (i) x/H=4.5;offset=×1; (ii) x/H=6.1;offset=×10; (iii) x/H=9.1;offset=×103; (iv) x/H=12.3;offset=×〈5×105). Vertical line in the spectra indicates the Strouhal number (=0.94) of the high-frequency vortex shedding.
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(a) Contour plot of fluctuation kinetic energy; (b) contour plot of averaged subgrid scale (SGS) viscosity. In both plots, dark shades represents higher magnitudes.

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