Question

Is thin viscous region forms over the airfoil at low angle of attack?

(a) True

(b) False

This question was posed to me in final exam.

I would like to ask this question from Viscous Flow in section Incompressible Flow over Airfoils of Aerodynamics

Answer 1

Right option is (a) True

For explanation: At low angle of attack, a thin viscous region forms over the airfoil, and grows from the leading edge to the trailing. On the upper surface, where adverse pressure gradients exists the boundary layer grows more rapidly.