This lecture covers the basic characteristics of turbulence, numerical flow simulation, and various methods for simulating turbulent flows, such as Direct Numerical Simulation (DNS), Large-Eddy Simulation (LES), and Reynolds-Averaged Navier-Stokes (RANS) equations. It also delves into the challenges of modeling turbulent viscosity and the importance of near-wall treatment. The lecture concludes with guidelines for choosing turbulence models and parameters, emphasizing the need for validation and understanding the limitations of each model.