What is a general consequence of turbulence within the boundary layer on moving objects like aircraft?

Answer

Turbulence often increases drag on the object.

Generally, turbulence within the boundary layer increases drag on a moving object. Although controlled turbulence (like on a golf ball) can decrease pressure drag, the general effect of flow chaos in the boundary layer is drag augmentation.

What is a general consequence of turbulence within the boundary layer on moving objects like aircraft?
flowlaminarturbulent