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TECHNICAL PAPERS

Dynamic Subgrid-Scale Modeling for Large-Eddy Simulations in Complex Topologies

[+] Author and Article Information
Stephen A. Jordan

Naval Undersea Warfare Center, Newport, RI 02841

J. Fluids Eng 123(3), 619-627 (Mar 15, 2001) (9 pages) doi:10.1115/1.1374215 History: Received October 06, 2000; Revised March 15, 2001
Copyright © 2001 by ASME
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References

Figures

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Downstream grid spacing πηd/δx and πηd/δy for the present computations referenced to the inertial subrange (Ong and Wallace 3) of the cylinder vortex street region; Re=3900
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Comparison of the present DNS computations (Re=3900) and the experimental velocity power and dissipation spectra in Kolmorgorov units for the cylinder vortex street; Ong and Wallace 3, x/D=5 and Uberoi and Freymuth 15x/D=200
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Snapshots of the turbulent eddy viscosity distribution (νT/ν) in the cylinder immediate wake as predicted by the nonconservative and conservative forms of the curvilinear dynamic model; (a) contours max. 12.0, min. −13.0, incr. 0.5 and (b) contours max. 16.0, min −11.0, incr. 0.5
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(Continued.)
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Instantaneous turbulent eddy viscosity (νT/ν) along the wake centerline as predicted by the nonconservative and conservative forms of the curvilinear dynamic model
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Phase-averaged and spanwise averaged distributions of the real, nonconservative and conservative normal stress τ11 within the immediate wake; contours max 0.008, min, −0.08, incr. 0.004
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Comparisons of the real and modeled normal SGS stresses (τ11 and τ22) along the wake centerline; nonconservative (NCDM) and conservative (CCDM)
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Comparisons of the real and modeled Reynolds stress τ12 along (a) the wake centerline and (b) the circumferential line (r/D=1.17); nonconservative (NCDM) and conservative (CCDM)
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Phase-averaged and spanwise averaged distributions of the SGS dissipation within the immediate wake; real: max 0.38, min. −0.018, incr. 0.018; nonconservative and conservative: max 0.11, min. −0.11, incr. 0.011
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Comparisons of the real and modeled SGS dissipation rates using the nonconservative and conservative forms of the curvilinear dynamic model; (a) along wake centerline (C indicates global correlation coefficient) and (b) along circumferential line r/D=1.17 in vortex formation regime
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Topology and flow conditions for the direct numerical simulation of the cylinder wake flow; 1 Jordan 9, Re=3400; 2 present computation, Re=3900

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