by T. Iliescu, V. John, W. J. Layton, G. Matthies, L. Tobiska.
Series: 2000-21, Preprints
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.