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TECHNICAL PAPERS

Waveform Dependence of Pulsatile Flow in a Stenosed Channel

[+] Author and Article Information
H. Liu

Division of Computer and Information, The Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan

T. Yamaguchi

Department of Mechanical and Systems Engineering, Nagoya Institute of Technology, Nagoya, Japan

J Biomech Eng 123(1), 88-96 (Oct 16, 2000) (9 pages) doi:10.1115/1.1339818 History: Received February 11, 1999; Revised October 16, 2000
Copyright © 2001 by ASME
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References

Figures

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Schematic diagram of a two-dimensional stenosed channel model with a coordinate system and enlarged grid systems at the end of the indentation
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Waveform of a generalized, physiological volumetric flow rate (Q=Ud) that varies in systolic acceleration–deceleration time ratio, η=tacc/tdec, with systolic interval fixed: (a) four waveforms of the flow rate (Q) with η=1.0(A),0.5(B),0.2(E), and 0.1(F); (b) four time courses of the acceleration of the inflow, i.e., the first derivatives of the flow rate, dQ/dt
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Iso-speed (a) and pressure (b) contours at Re=750 and St=0.024 at ten points of the waveform (A) with η=1.0 as shown in Fig. 2(a,b): (a) t=0.11,(b)t=0.17, (b) t=0.22,(b+)t=0.26, (c) t=0.34,(d)t=0.41, (d) t=0.45,(d+)t=0.52, (e) t=0.73, and (f) t=1.0. Bright color level represents magnitudes of the speed and pressure, speed and pressure increasing from black to bright; wall shear stress (c) and pressure (d) distributions at Re=750 and St=0.024 at five points of the waveform (A) with η=1.0 as shown in Fig. 2(a,b). Note that the pressure of Poiseuille flow is also plotted in Fig. 3(d).
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Iso-speed contours at Re=750 and St=0.024 at five points of the waveforms with η=1.0 (A), 0.5 (B), 0.2 (E), and 0.1 (F). Bright color level represents magnitudes of the speed, speed increasing from black to bright.
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Wall shear stresses (a) on the lower wall at four points, a, b, c, and d, and pressures (b) on the centerline at two points, b and c, at Re=750 and St=0.024, with η=1.0 (A), 0.5 (B), 0.2 (E), and 0.1 (F). Note that the pressure of Poiseuille flow is also plotted in Fig. 5(b).
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Waveform of a generalized, physiological volumetric flow rate (Q=Ud) that varies in systole-to-diastole time ratio, ξ=tsys/tdias, with systolic and diastolic form fixed. a, four waveforms of the flow rate (Q) with ξ=2.0(A),1.0(B),0.33(D),0.2(F), and 0.1(G). Note that case B here has the same waveform as that of case A in Fig. 2(a,b).
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(a) Iso-speed contours at Re=750 and St=0.024 at point c of the waveforms with ξ=2.0 (A), 1.0 (B), 0.33 (D), 0.2 (F), and 0.1 (G). Bright color level represents magnitudes of the speed, speed increasing from black to bright; wall shear stresses (a) on the lower wall at point c and pressures (c) on the centerline, at Re=750 and St=0.024, with ξ=2.0 (A), 1.0 (B), 0.33 (D), 0.2 (F), and 0.1 (G). Note that the pressure of Poiseuille flow is also plotted in Fig. 7(c).

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