On Homogenization-Based Methods for Large-Eddy Simulation

[+] Author and Article Information
L. Persson

The Swedish Defense Research Agency, FOI, Department of NBC Defense, Environment and Protection, SE-901 82 Umea, Sweden

C. Fureby

The Swedish Defense Research Agency, FOI, Department of Weapons and Protection, Warheads and Propulsion, SE-172 Stockholm, Sweden

N. Svanstedt

Chalmers University of Technology, Department of Mathematics, SE-412 96 Gothenburg, Sweden

J. Fluids Eng 124(4), 892-903 (Dec 04, 2002) (12 pages) doi:10.1115/1.1516577 History: Received March 12, 2002; Revised June 24, 2002; Online December 04, 2002
Copyright © 2002 by ASME
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Grahic Jump Location
A typical sample path of w , according to Eq. (40), in green with a sample path of the Brownian motion (in red) in the one-dimensional case
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Comparison of (a) the energy spectrum E and (b) the PDF of the vorticity magnitude |ω̄| of forced homogeneous isotropic turbulence at ReT=96 at 643 resolution for conventional LES, using the OEEVM, and the homogenisation-based LES model
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Volumetric visualization in terms of iso-surfaces of the vorticity magnitude |ω | and contours of the eddy viscosity νk and |A | of forced homogeneous isotropic turbulence at ReT=96 at 643 resolution from (a) conventional LES using the OEEVM, and from (b) the homogenization based LES model
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Contours of streamwise vorticity ω̄1 projected onto the side and bottom walls together with contours of the streamwise velocity fluctuations v1=v̄1−〈v̄1〉 at y+≈20, and iso-surfaces of the second invariant of the velocity gradient tensor Q for (a) OEEVM and (b) the homogenization-based subgrid model at 603 resolution at Reτ=395
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Time-averaged velocity profiles 〈v̄1〉 (a) in outer scaling and the corresponding rms velocity fluctuations v̄1rms (b) in inner scaling for the fully developed turbulent channel flow case at Reτ=395




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