Turbulence is a complex physical phenomenon prevalent in many engineering applications including automobiles, aircraft, combustion engines, wind turbines, etc. A turbulent flow consists of numerous length and time scales, the number of which increases with Reynolds number. The Navier-Stokes equations completely describe a turbulent flow field but the vast amount of information contained does not make direct numerical simulation (DNS) practical, or even possible, to obtain computationally. The turbulence modeling technique of large-eddy simulation (LES) provides an alternative to DNS by not resolving every scale, only the large scales. The LES technique and the challenges that inhibit the technique from being commonplace in industry will be the focus of this presentation. With the goal of using LES for wind engineering applications, methods to alleviate some of challenges of LES of high-Reynolds-number turbulent flows will be presented.