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TECHNICAL PAPERS

Numerical Simulation of Unsteady Turbulent Flow in Axisymmetric Sudden Expansions

[+] Author and Article Information
Baoyu Guo, Tim A. G. Langrish, David F. Fletcher

Department of Chemical Engineering, University of Sydney, NSW 2006, Australia

J. Fluids Eng 123(3), 574-587 (Mar 02, 2001) (14 pages) doi:10.1115/1.1374441 History: Received October 12, 1999; Revised March 02, 2001
Copyright © 2001 by ASME
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References

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Figures

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A schematic representation of the geometry of the experiment by Lawson and Davidson 8
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Variation of Strouhal number with swirl number (Dellenback et al. 3)
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A schematic diagram of the geometric model used by Gebert et al. 18
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A schematic diagram of the geometry
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A typical grid used in the calculations
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Flow variables at the monitoring point 4D downstream from the expansion on the center-line (E=5,Re=105)
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Amplitude of transverse velocity (conditions as in Fig. 6)
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Direction angle of transverse velocity (conditions as in Fig. 6)
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Flow variables at the monitoring point 0.4 D from center-line and 4D downstream from the expansion (conditions as in Fig. 6)
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Limit cycles at different axial locations (conditions as in Fig. 6) (a) 0.2D from the expansion; (b) 4D from the expansion
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A schematic diagram showing a jet precessing and flapping
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Instantaneous streaklines calculated for precessing flow in an axisymmetric sudden expansion (E=5.0,Re=105)
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A schematic interpretation of the instantaneous streaklines
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An iso-surface for axial velocity (E=5.0,Re=105). The spiraling direction relative to the precession is indicated schematically.
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Instantaneous velocity vectors in a cross-stream plane 0.2D downstream from the expansion (E=5.0,Re=105)
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Instantaneous pressure contours in a cross-stream plane 0.2D downstream from the expansion (E=5.0,Re=105)
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Contour plot in a cross sectional plane 1.6D from the expansion (E=5.0,Re=105)
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Wall velocity vectors and static pressure contour map (E=5.0,Re=105). The pressure contour values are relative pressure, which are scaled up by a factor of 103.
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Schematic map of flow patterns in axisymmetric sudden expansions. The data marked “others” in the legend are for steady conditions from Durrett et al. 9, Back et al. 10, Gould et al. 12, and Moon et al. 11.
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Schematic diagram of the dimensions in the definition of Strouhal number for a non-circular chamber
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A plot of Strouhal number for precession against Reynolds number
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The effect of expansion ratio on Strouhal number for oscillations in axisymmetric sudden expansion. PJ denotes the regular precession mode.
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Flow variables at the monitoring point 4D downstream from the expansion on the center-line, indicating a flapping mode (E=3.5,Re=105)
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Two modes of oscillations expressed by the limit cycles for E=3.95,Re=1.27×105 (monitored at the center of the expansion)
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Time series of pressure for the case of complex oscillations (E=6.0, monitoring point at 3.7D from the expansion, Re=8.34×104)
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The amplitude of the transverse velocity component (corresponding to Fig. 25)
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The phase angle of the transverse velocity component (corresponding to Fig. 25)
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A schematic diagram of the reflection of the jet motion with different expansion ratios, explaining how a large expansion ratio produces a higher precession frequency. (The arrows indicate the direction of the jet motion.)

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