We recently developed a new KES (kinetic-eddy simulation) model that differs considerably from hybrid RANS-LES models. KES resolves the subgrid kinetic energy and the local characteristic length scale associated with the corresponding subgrid kinetic energy. KES is an LES methodology, but in the case where the local grid resolution is not adequate, it smoothly transitions to VLES and only the very largest scales are resolved. The ability to transition smoothly from LES to VLES is a unique property of KES and, as a result, the KES model can be considered a VLES-LES approach. The KES model is developed with applications to massively separated flow at high Reynolds numbers. The KES model has been successfully applied to simulate static stall around a 3-D NACA0015 wing, oscillatory attached flow, and dynamic light/deep stalls around a 2-D NACA0015 airfoil. Vortex shedding and massive separation are clearly captured. The predicted airloads compare very well with experimental measurements. The behavior of the KES model on high angle-of-attack aerodynamics has been studied.
We will also briefly present some of our other work on LES modeling of wall-bounded turbulent flow at high Reynolds numbers.