Boundary Layers: Recap and Effects on Drag and Lift

This lecture provides a recap on boundary layers, emphasizing their importance even at high Mach numbers where viscous forces are negligible. The instructor explains the concept of boundary layer thickness and the Reynolds number, discussing the laminar and turbulent results. The effects of viscosity on the boundary layer, drag, and lift coefficients are explored, along with the phenomenon of flow separation and stall. The presentation includes insights on potential flow, pressure distribution, and the impact of angle of attack on lift and drag. Various scenarios are illustrated to demonstrate the behavior of boundary layers in different flow conditions.