Question

It is possible to have lift without friction (i.e. in an inviscid medium).

(a) True

(b) False

The question was asked in an internship interview.

My enquiry is from Kelvin’s Circulation Theorem and the Starting Vortex topic in chapter Incompressible Flow over Airfoils of Aerodynamics

Answer 1

The correct option is (b) False

To explain I would say: Nature enforces Kutta Condition through the means of the boundary layer (friction). If there were no friction Kutta condition would not be achieved and there will be no lift.