Analysis of truncation errors and design of physically optimized discretizations

Conference paper (2008)

Authors

S. Hickel Technische Universität München
Nikolaus A. Adams Technische Universität München
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External organisation
Optimization Implicit LES Subgrid-scale modeling Truncation error
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Published Date

01-01-2008

Language

English

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Abstract

Further development of Large Eddy Simulation (LES) faces as major obstacle the strong coupling between subgrid-scale (SGS) model and the truncation error of the numerical discretization. Recent analyzes indicate that for certain discretizations and certain flow configurations the truncation error itself can act as implicit SGS model. In this paper, we explore how implicit SGS models can be derived systematically and propose a procedure for design, analysis, and optimization of nonlinear discretizations. Implicit LES can be made rigorous by requiring that the numerical dissipation approximates the SGS dissipation obtained from the analysis of nonlinear interactions in turbulence.