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Research Papers: Fundamental Issues and Canonical Flows

Assessment of Large-Eddy Simulation of Internal Separated Flow

[+] Author and Article Information
Marco Hahn1

Department of Aerospace Sciences, Fluid Mechanics and Computational Science Group, Cranfield University, Bedfordshire MK43 0AL, UKm.hahn@cranfield.ac.uk

Dimitris Drikakis

Department of Aerospace Sciences, Fluid Mechanics and Computational Science Group, Cranfield University, Bedfordshire MK43 0AL, UK

1

Corresponding author.

J. Fluids Eng 131(7), 071201 (Jun 01, 2009) (15 pages) doi:10.1115/1.3130243 History: Received March 31, 2008; Revised April 14, 2009; Published June 01, 2009

This paper presents a systematic numerical investigation of different implicit large-eddy simulations (LESs) for massively separated flows. Three numerical schemes, a third-order accurate monotonic upwind scheme for scalar conservation laws (MUSCL) scheme, a fifth-order accurate MUSCL scheme, and a ninth-order accurate weighted essentially non-oscillatory (WENO) method, are tested in the context of separation from a gently curved surface. The case considered here is a simple wall-bounded flow that consists of a channel with a hill-type curvature on the lower wall. The separation and reattachment locations, velocity, and Reynolds stress profiles are presented and compared against solutions from classical LES simulations.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

The computational H-H-type grid topology and the three different grids employed in the simulations of the hill flow

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Figure 2

Flow features in the channel visualized by time- and space-averaged streamlines and instantaneous vortical structures defined by the Q-criterion

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Figure 3

Comparison of the averaged streamwise velocity and Reynolds stresses near the hill crest at x/h=0.05 as obtained by different high-resolution methods on the coarse, medium and modified grids with the reference LES

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Figure 4

Comparison of the averaged streamwise velocity and Reynolds stresses across the recirculation zone at x/h=2 as obtained by different high-resolution methods on the coarse, medium and modified grids with the reference LES

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Figure 5

Comparison of the averaged streamwise velocity and Reynolds stresses after reattachment at x/h=6 as obtained by different high-resolution methods on the coarse, medium and modified grids with the reference LES

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Figure 6

Comparison of the averaged streamwise velocity and Reynolds stresses above the windward slope at x/h=8 as obtained by different high-resolution methods on the coarse, medium and modified grids with the reference LES

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Figure 7

Location of the four measurement points for the turbulence power spectra in relation to the flow phenomena visualized by averaged streamlines

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Figure 8

Comparison of the one-dimensional turbulence power spectra as obtained by M3 on the modified grid

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Figure 9

Comparison of the one-dimensional turbulence power spectra as obtained by different high-resolution methods on the modified grid

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Figure 10

Comparison of the one-dimensional turbulence power spectra as obtained by M3 on the coarse, medium, and modified grids

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