Abstract: Large eddy simulations with three subgrid eddy viscosity models,i.e., the classic Smagorinsky model,the dynamical Smagorinsky model and a model derived from Kolmogorov equation by Cui(2004),are performed to study turbulent channel flows with a wall oscillation in the spanwise direction.The capability of the subgrid eddy viscosity models in predicting statistical three-dimensional unsteady flows is evaluated.It is found that the new model and the dynamical model are both capable of predicting three-dimensional unsteady turbulent flows;and the dynamical model can achieve a higher accuracy;the classic Smagorinsky model yields the worst result.

Key words: large eddy simulation, subgrid scale model, turbulent channel flow, periodic motion