An adaptive local deconvolution method for implicit LES with optimized spectral eddy viscosity

Conference paper (2005)

Authors

S. Hickel Technische Universität München
Nikolaus A. Adams Technische Universität München
J. A. Domaradzki University of Southern California
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Published Date

01-12-2005

Language

English

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Abstract

The Adaptive Local Deconvolution Method (ALDM) is a new nonlinear discretization scheme designed for Implicit Large-Eddy Simulation (ILES). Free parameters of a solution-adaptive deconvolution operator allow to adjust the numerical truncation error which acts as implicit subgrid-scale (SGS) model. To assign physically appropriate values to these parameters the spectral numerical viscosity is analyzed. By an automatic optimization employing an evolutionary algorithm a set of parameters was found which yields an excellent spectral match for the numerical viscosity with theoretical predictions. Computational results for forced and decaying three-dimensional homogeneous isotropic turbulence show an excellent agreement with theory and experimental data.