Bonjour roulis
A theoretical for you. As to streamlines, it is accepted that no matter may pass through them, so as to wing area ( Span x mean Chord). Do these phenomena imcrease the effective area of the wing? We see that the two streamlines, when reconnected, prevent for a short distance any alteration in flow, yes? It is Kutta, at the other end?
Also, this.....
A wind tunnel is created that separates two areas, one, the lower, is air, the upper (above the wing) is completely evacuated, though the pressure is maintained at constant level throughout the tunnel, (bear with me).
The wing is in constant contact with the lower (moving) airmass, there is no mass above the leading edge. Is there "lift"?