Large Eddy Simulation of Turbulent Channel Flows by the Rational LES Model

TitleLarge Eddy Simulation of Turbulent Channel Flows by the Rational LES Model
Publication TypeReport
Year of Publication2002
AuthorsIliescu, T, Fischer, PF
Date Published03/2002
Other NumbersANL/MCS-P938-0302
Abstract

<p>The rational large eddy simulation (RLES) model is applied to turbulent channel flows. This approximate deconvolution model is based on a rational (subdiagonal Pad) approximation of the Fourier transform of the Gaussian filter and is proposed as an alternative to the gradient (also known as the nonlinear or tensor-diffusivity) model. We used a spectral element code to perform large eddy simulations of incompressible channel flows at Reynolds numbers based on the friction velocity and the channel half-width Ret = 180 and Ret = 395. We compared the RLES model with the gradient model. The RLES results showed a clear improvement over those corresponding to the gradient model, comparing well with the fine direct numerical simulation. For comparison, we also present results corresponding to a classical subgrid-scale eddy-viscosity model such as he standard Smagorinsky model.</p>

PDFhttp://www.mcs.anl.gov/papers/P938.ps.Z