Assessment of subgrid-scale models in wall-modeled large-eddy simulations of turbulent channel flows

Considering the demanding of grid requirements for high-Reynolds-number wall-bounded flow, the wall-modeled large-eddy simulation (WMLES) is an attractive method to deal with near wall turbulence. However, the effect of subgrid-scale (SGS) models for wall-bounded turbulent flow in combination with wall stress models is still unclear. In this paper, turbulent channel flow at Re-& tau; =1 000 are numerically simulated by WMLES in conjunction with four different SGS models, i.e., the wall-adapting local eddy-viscosity model, the dynamic Smagorinsky model, the dynamic SGS kinetic energy model and the dynamic Lagrangian model. The mean velocity profiles are compared with the law of the wall, and the velocity fluctuations are compared with direct numerical simulation data. The energy spectrum of velocity and wall pressure fluctuations are presented and the role of SGS models on predicting turbulent channel flow with WMLES is discussed.

Automated summary

This paper numerically simulates turbulent channel flow at Re-& tau; = 1000 using the wall-modeled large-eddy simulation (WMLES) method in conjunction with four different subgrid-scale (SGS) models. The effects of SGS models on predicting turbulent channel flow with WMLES are evaluated by comparing mean velocity profiles, velocity fluctuations, and energy spectra.