HIGH REYNOLDS-NUMBER CALCULATIONS USING THE DYNAMIC SUBGRID-SCALE STRESS MODEL

The dynamic subgrid-scale eddy viscosity model has been used in the la rge-eddy simulation of the turbulent flow in a plane channel for Reyno lds numbers based on friction velocity and channel half-width ranging between 200 and 2000, a range including values significantly higher th an in previous simulations. The computed wall stress, mean velocity, a nd Reynolds stress profiles compare very well with experimental and di rect simulation data. Comparison of higher moments is also satisfactor y. Although the grid in the near-wall region is fairly coarse, the res ults are quite accurate: the turbulent kinetic energy peaks at y+ cong ruent-to 12, and the near-wall behavior of the resolved stresses is ca ptured accurately. The model coefficient is o(10(-3)) in the buffer la yer and beyond, where the cutoff wave numbers are in the decaying regi on of the spectra; in the near-wall region the cutoff wave numbers are nearer the energy-containing range, and the resolved turbulent stress es become a constant fraction of the resolved stresses. This feature i s responsible for the correct near-wall behavior of the model coeffici ent. In the near-wall region the eddy viscosity is reduced to account for the energy transfer from small to large scales that may occur loca lly.