A thorough investigation of leading edge heat transfer on a model geometry has been performed using Large-eddy simulation (LES). with support from the current and a previous AFOSR grant. The results from the leading edge study are presented as a detailed Appendix in this report. To address the problem of solving the full three-dimensional turbulent flow in a turbine passage. including the effects of free-stream turbulence from the combustor, and the unsteady interactions between various blade rows in the form of moving wakes and shocks it was necessary to extend the LES solver. A high-order overset LES code suitable for the study of turbomachinery passages has been developed. This approach is summarized in this report. Some preliminary results have been obtained using this code, mostly as cases for code validation. The code is currently being used to investigate flow in turbine passages under realistic conditions, and detailed comparisons with available experiments will be made.