Performance of Different SGS Models of LES for Low Mach Number Channel Flow

AbstractSome recent subgrid-scale models are evaluated in turbulent channel flow at Reτ = 180, using Low Mach number approach. The models considered were chosen among those performing best in decaying isotropic turbulence, following the study by Winckelmans & Jeanmart[14], the dynamic Smagorinsky model (used as a baseline); In the present work, we consider several different sub grid-scale models for thermal part and kinetic part. For modeling sub–grid stresses, we have used Dynamic Smagorinsky model developed by Germano et al. [6] and a Wall Adaptive Layer Equation (WALE) model suggested by Nicoud and Ducros[12]. For thermal part, we have used a dynamic model and a mixed scale model.The last three models put more emphasis than the Smagorinsky model on the sub grid-scale (SGS) dissipation at small scales, leading to significant improvement of the results in isotropic turbulence. The models are assessed and compared to the direct numerical simulation (DNS) data of Moser, Kim & Mansour[9] on the basis of mean profiles of velocity, rms velocities and reduced (deviatoric) turbulence intensities