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TECHNICAL PAPERS

A Mixed-Time-Scale SGS Model With Fixed Model-Parameters for Practical LES

[+] Author and Article Information
Masahide Inagaki

Digital Engineering Laboratory, Toyota Central Research & Development Laboratories, Inc., Nagakute, Aichi 480-1192, Japan

Tsuguo Kondoh

System Engineering & Electronics Department, Toyota Central Research & Development Laboratories, Inc., Nagakute, Aichi 480-1192, Japan

Yasutaka Nagano

Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan

J. Fluids Eng 127(1), 1-13 (Mar 22, 2005) (13 pages) doi:10.1115/1.1852479 History: Received May 16, 2003; Revised July 30, 2004; Online March 22, 2005
Copyright © 2005 by ASME
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References

Figures

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A priori test for the SGS eddy viscosity in the channel flow (case 1)
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Predictions of channel flow (case 1): (a) mean velocity, (b) turbulent intensities, and (c) SGS eddy viscosity
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Near-wall behavior of the SGS eddy viscosity (case 2)
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Predictions of channel flow (case 4): (a) mean velocity and (b) turbulent intensities
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Computational error in the total mass flux in the channel
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Variation of SGS eddy viscosity according to the change of grid resolution
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Ratio of two time-scales used in the present model in the channel flow
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Computational domain and coordinate system for rotating channel flow
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Predictions of rotating channel flows using the present model: (a) mean velocity in global coordinate, (b) mean velocity in wall coordinate, (c) streamwise turbulent intensity, (d) wall-normal turbulent intensity, and (e) spanwise turbulent intensity
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Behavior of the present model in response to the change of rotation number: (a) SGS eddy viscosity, and (b) ratio of two time-scales
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Computational domain and coordinate system for backward-facing step flow
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Predictions of backward-facing step flow: (a) mean streamwise velocity, (b) streamwise turbulent intensity, (c) Reynolds shear stress, and (d) SGS eddy viscosity
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Ratio of two time-scales used in present model in backward-facing step flow
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Effect of y-direction filtering in the dynamic Smagorinsky model: (a) model parameter Cs, (b) SGS eddy viscosity, and (c) Reynolds shear stress
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Computational domain and coordinate system for flow around the circular cylinder
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Pressure distribution on the cylinder surface
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Ratio of two time-scales used in the present model in flow around the circular cylinder
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Comparison of results of flow around the circular cylinder along radial lines: (a) mean streamwise velocity, (b) streamwise turbulent intensity, (c) mean pressure coefficient, and (d) SGS eddy viscosity
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Comparison of results of flow around the circular cylinder with experimental data: (a) mean streamwise velocity and (b) streamwise turbulent intensity
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Appearance of the Ahmed body and dimensions
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Comparison of results of flow around the Ahmed body in symmetry plane: (a) mean streamwise velocity, (b) streamwise turbulent intensity, and (c) SGS eddy viscosity
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Comparison of results of flow around the Ahmed body in x=200 mm plane: (a) mean streamwise velocity, (b) Reynolds shear stress, and (c) SGS eddy viscosity

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