Since gases are unique in the way they convert pressure change to heat or cold, none of the above can be true. The schema shows more columns of air under the wing than pass above. How come? We know that an actual wing pulls air down from the layers above rather than bludgeon the air in front of it.
What happens is that vortices are engendered. Wing design is all about getting them past the control sections (the major problem to aircraft design in the 1940's.)
It is a convention in fluid dynamics that the flow always comes from the left. Nobody working in this field would ever draw a picture with the flow coming from the right side. So this is a hint by its own that the image may be wrong.
Regarding the last comment: The image is from wikipedia. The original comment tells us that the wing influences the flow even at a great distance. The flow at the top is still a lot faster than below the wing.
18.104.22.168 21:01, 3 June 2015 (UTC)
My high school math teacher said there were three ways for a teacher to say "I don't know" -- "I don't know", "It's beyond the scope of the course", and "You wouldn't understand it if I told you." So, whenever we asked a question like the one in the comic, he'd say "It's beyond the scope of the course, and you wouldn't understand it if I told you anyway! Dumb kids!" We loved that guy. 22.214.171.124 17:01, 5 July 2018 (UTC)
This airfoil problem is a 2D problem and the classical Bernoulli's equation is a 1D equation. If you use velocity vector(speed and direction) instead speed the equation works.