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TECHNICAL PAPERS: Forced Convection

Direct Numerical Simulation of Turbulent Separated Flow and Heat Transfer Over a Blunt Flat Plate

[+] Author and Article Information
Hideki Yanaoka

Department of Intelligent Machines and System Engineering, Hirosaki University, 3 Bunkyo-cho, Hirosaki 036-8561, Japan

Hiroyuki Yoshikawa, Terukazu Ota

Department of Machine Intelligence and Systems Engineering, Tohoku University, 01 Aramaki-Aoba, Aoba-ku, Sendai 980-8579, Japan

J. Heat Transfer 125(5), 779-787 (Sep 23, 2003) (9 pages) doi:10.1115/1.1597623 History: Received August 12, 2002; Revised April 30, 2003; Online September 23, 2003
Copyright © 2003 by ASME
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References

Ota,  T., and Kon,  N., 1974, “Heat Transfer in the Separated and Reattached Flow on a Blunt Flat Plate,” ASME J. Heat Transfer, 96, pp. 459–462.
Ota,  T., and Narita,  M., 1978, “Turbulence Measurements in a Separated and Reattached Flow Over a Blunt Flat Plate,” ASME J. Fluids Eng., 100, pp. 224–228.
Ota, T., and Kato, H., 1991, “Turbulent Heat Transfer in a Separated and Reattached Flow Over a Blunt Flat Plate,” Proceedings of The 3rd ASME/JSME Thermal Engineering Joint Conference, J. R. Lloyd and Y. Kurosaki, eds., ASME, Reno, Nevada, 3 , pp. 191–196.
Ota, T., and Ohi, N., 1995, “Turbulent Heat Transfer in a Separated and Reattached Flow Over a Blunt Flat Plate,” Proceedings of The 4th ASME/JSME Thermal Engineering Joint Conference, L. S. Fletcher and T. Aihara, eds., ASME, Maui, Hawaii, 1 , pp. 363–370.
Kiya,  M., and Sasaki,  K., 1983, “Structure of a Turbulent Separation Bubble,” J. Fluid Mech., 137, pp. 83–113.
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Djilali,  N., and Gartshore,  I. S., 1991, “Turbulent Flow Around a Bluff Rectangular Plate. Part I: Experimental Investigation,” ASME J. Fluids Eng., 113, pp. 51–59.
Tafti,  D. K., and Vanka,  S. P., 1991, “A Numerical Study of Flow Separation and Reattachment on a Blunt Plate,” Phys. Fluids A, 3(7), pp. 1749–1759.
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Lane,  J. C., and Loehrke,  R. I., 1980, “Leading Edge Separation From a Blunt Plate at Low Reynolds Number,” ASME J. Fluids Eng., 102, pp. 494–496.
Ota,  T., Asano,  Y., and Okawa,  J., 1981, “Reattachment Length and Transition of the Separated Flow Over Blunt Flat Plates,” Bull. JSME, 24(192), pp. 941–947.
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Ota, T., and Yanaoka, H., 1993, “Numerical Analysis of a Separated and Reattached Flow Over a Blunt Flat Plate,” Proceedings of the 5th International Symposium on Computational Fluid Dynamics, H. Daiguji, ed., Jpn. Soc. Comp. Fluid Dynamics, Sendai, 2 , pp. 423–428.
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Figures

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Flow configuration and coordinate system
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Variation of reattachment length with Reynolds number
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Isosurface of curvature of equi-pressure surface at T=120 (a) side view; (b) top view
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Isosurface of second invariant of velocity gradient at T=240
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Velocity fluctuations along separated shear layer at z/H=2 (T=240)
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Velocity vectors ((a) and (c)) and temperature contours ((b) and (d)) at T=240
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Power spectrum (a) x-component velocity outside the separated shear layer and (b) z-component one near the leading edge
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Velocity vectors (a) x−y plane at z/H=2 (b) y−z plane at x/H=1 (T=240)
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(a) Correlation of Nusselt number at reattachment point with Reynolds number; (b) Time averaged and rms values of Nusselt number.
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x-component mean velocity (○; Ota—Kon (Re=23400), ▵; Kiya—Sasaki (Re=26000), □; Djilali—Gartshore (Re=50000), –; Present (Re=5000))
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Turbulence intensities of x and y-components of velocity fluctuation (○; Ota—Narita (Re=24000), ▵; Kiya—Sasaki (Re=26000), □; Djilali—Gartshore (Re=5000), –; Present (Re=5000))
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Reynolds shear stress (○; Ota—Narita (Re=24000), ▵; Kiya—Sasaki (Re=26000), –; Present (Re=5000))
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Mean temperature (○; Ota—Kon (Re=23400), –; Present (Re=5000))
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Mean temperature and turbulence intensity of temperature fluctuation
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x and y-components of turbulent heat flux
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Ratio of two components of turbulent heat flux

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