Large eddy simulation (LES) is a computational fluid dynamics (CFD) technique used to simulate turbulent flows. In LES, only the large scale turbulent eddies are resolved directly, while the small scale eddies are modeled to account for their effects on the flow. This approach allows for more accurate and detailed simulations of complex turbulent flows compared to traditional Reynolds-averaged Navier-Stokes (RANS) simulations. LES is commonly used in areas such as aerospace engineering, meteorology, and environmental fluid dynamics to study turbulence and its effects on various processes. It is particularly well-suited for capturing the unsteady and three-dimensional nature of turbulent flows, making it a valuable tool for understanding and predicting complex fluid dynamics phenomena.