designing layout

The laminar boundary is a very smooth flow, while theturbulent boundary layer contains swirls or "eddies." The laminar flow creates less skin friction drag than theturbulent flow, but is less stable. Boundary layer flow over a wing surface begins as a smooth laminar flow.

The flow can be divided into three regions: an inner wall region next to the wall where the turbulent stress is negligible and the viscous stress is large, an outer region where the turbulent stress is large and the viscous stress is small and an overlap region sometimes called a turbulent zone.