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SPECIAL SECTION ON RANS/LES/DES/DNS: THE FUTURE PROSPECTS OF TURBULENCE MODELING

LES of Turbulent Separated Flow and Heat Transfer in a Symmetric Expansion Plane Channel

[+] Author and Article Information
Kazuaki Sugawara, Hiroyuki Yoshikawa

Department of Mechanical Systems and Design, Tohoku University, 6-6-01 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan

Terukazu Ota

Department of Mechanical Systems and Design, Tohoku University, 6-6-01 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japanota@cc.mech.tohoku.ac.jp

J. Fluids Eng 127(5), 865-871 (May 23, 2005) (7 pages) doi:10.1115/1.1988344 History: Received July 22, 2004; Revised May 23, 2005

The LES method was applied to analyze numerically an unsteady turbulent separated and reattached flow and heat transfer in a symmetric expansion plane channel of expansion ratio 2.0. The Smagorinsky model was used in the analysis and fundamental equations were discretized by means of the finite difference method, and their resulting finite difference equations were solved using the SMAC method. The calculations were conducted for Re=15,000. It is found that the present numerical results, in general, agree well with the previous experimental ones. The complicated vortical flow structures in the channel and their correlations with heat transfer characteristics are visualized through various fields of flow quantities.

Copyright © 2005 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Flow configuration and coordinate system

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Figure 2

Time averaged Nusselt number (z∕H=0.0)

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Figure 3

Reverse flow rate (y∕H=±1.85,z∕H=0.0)

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Figure 4

Time averaged velocity (z∕H=0.0). (a) u¯; (b) v¯.

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Figure 5

Turbulence intensities, Reynolds shear stress and turbulent kinetic energy (z∕H=0.0). (a) urms′; (b) vrms′; (c) −u′v′¯; (d) k.

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Figure 6

Time averaged SGS eddy viscosity (z∕H=0.0)

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Figure 8

Power spectrum of θ′(y∕H=1.0,z∕H=0.0)

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Figure 11

Instantaneous temperature (T=0)

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Figure 13

Instantaneous temperature (T=0)

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Figure 17

Isosurface of Q(Q=0.8,T=0)

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Figure 16

Instantaneous Nusselt number and skin friction coefficient (ΔCf=1.0×10−3,T=0)

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Figure 15

Instantaneous enstrophy (T=0)

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Figure 14

Instantaneous enstrophy (T=0)

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Figure 9

Time averaged surface pressure coefficient (z∕H=0.0)

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Figure 7

Power spectrum of v′(y∕H=1.0,z∕H=0.0)

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Figure 12

Instantaneous enstrophy (T=0)

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Figure 10

Time averaged skin friction coefficient (z∕H=0.0)

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