Optimal LES and a New Near-Wall Model for Application to High-Reynolds-Number Air Foils

One of the most promising techniques for the prediction of turbulent flows is Large Eddy Simulation (LES), in which the largest scales of turbulent fluid motion are simulated while the effect of the smaller unresolved scales are modeled. However, one of the major obstacles to the use of LES in technologically important turbulent flows, such as the flow over an airfoil, is the modeling of the near-wall turbulence. Current LES modeling approaches require that either the near-wall turbulence be adequately resolved (at unacceptable expense for large Reynolds numbers), or that an LES wall-model be used, which to date has not provided accurate results in relatively complex flows (e.g. an airfoil near stall).