Implicit large-eddy simulation applied to turbulent channel flow with periodic constrictions |
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Authors: | S Hickel T Kempe N A Adams |
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Institution: | 1. Institute of Aerodynamics, Technische Universit?t München, 85747, Garching, Germany 2. Institute of Fluid Mechanics, Technische Universit?t Dresden, 01062, Dresden, Germany
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Abstract: | The subgrid-scale (SGS) model in a large-eddy simulation (LES) operates on a range of scales which is marginally resolved
by discretization schemes. Accordingly, the discretization scheme and the subgrid-scale model are linked. One can exploit
this link by developing discretization methods from subgrid-scale models, or the converse. Approaches where SGS models and
numerical discretizations are fully merged are called implicit LES (ILES). Recently, we have proposed a systematic framework
for the design, analysis, and optimization of nonlinear discretization schemes for implicit LES. In this framework parameters
inherent to the discretization scheme are determined in such a way that the numerical truncation error acts as a physically
motivated SGS model. The resulting so-called adaptive local deconvolution method (ALDM) for implicit LES allows for reliable
predictions of isotropic forced and decaying turbulence and of unbounded transitional flows for a wide range of Reynolds numbers.
In the present paper, ALDM is evaluated for the separated flow through a channel with streamwise-periodic constrictions at
two Reynolds numbers Re = 2,808 and Re = 10,595. We demonstrate that, although model parameters of ALDM have been determined for isotropic turbulence at infinite
Reynolds number, it successfully predicts mean flow and turbulence statistics in the considered physically complex, anisotropic,
and inhomogeneous flow regime. It is shown that the implicit model performs at least as well as an established explicit model.
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Keywords: | 47 11 Df 47 20 Ib 47 27 ep 47 50 Cd |
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