A D Channel Flow Simulation at Re Using a Rational Les Model

This paper presents numerical results obtained by applying an LES model based on a rational subdiagonal Pad e approximation in the wave number space We used a spectral element code to test this LES model a coarse DNS and the Smagorinsky model with Van Driest damping in the numerical simulation of a D channel ow at Re The corresponding results were compared with the ne DNS simulation of Moser Kim and Mansour Introduction Introduced in by Deardor Large Eddy Simulation LES is one of the most promising approaches to the numerical simulation of turbulent ows LES has a rich history being success fully developed and applied to a wide range of applications by the engineering and geophysics communities LES is based on the idea that the large scales in the ow are essential being responsible for the important engineering quantities heat transfer mixing etc whereas the small scales are important because of their e ect on the large scales Another important assumption in LES is that the small scales of turbulence are more isotropic and more universal than the large scales The usual LES starts by convoluting the Navier Stokes equations NSE with a spatial lter g