Hi all, I am looking to learn more about boundary layer control devices that can delay boundary layer transition (Laminar to Turbulent) and also BL devices that can delay flow separation. I have already found loads of info on Vortex Generators but i am having trouble finding info on things like BL Suction and Blowing, Surface Roughness, why cooling the wing surface would encourage laminar flow, wing fences, saw tooth leading edges etc. I am hoping to understand their effects on the pressure and velocity of the freestream in a descriptive sense. Any information, knowledge or links to descriptions of these control devices would be greatly appreciated. Thank you.