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2000-21

An Assessment of Models in Large Eddy Simulation

by T. Iliescu, V. John, W. J. Layton, G. Matthies, L. Tobiska.


Series: 2000-21, Preprints

MSC:
76M10 Finite element methods

Abstract:
This paper presents a numerical comparison between
a rational LES model introduced by Galdi and Layton (2000) and a classical LES
model. The new LES model is based on a rational approximation of the
Fourier transform of the Gaussian filter while the classical LES model uses
a Taylor polynomial
approximation. The numerical experiments for the 2D driven cavity test
problem show a clear improvement in solution quality for the
rational LES model. This improvement is consistent with the new
closure approximation which provides better attenuation of high frequencies.

Keywords: