Why does the spanwise flow along a swept wing not accelerate? I read this article explaining flow around a fixed-sweep swept wing, and it stated that the spanwise flow component does not accelerate, but the chordwise flow component does. What is so special about spanwise flow that it does not accelerate?
In chordwise direction there is a curvature that accelerates the flow. In spanwise direction there is no such curvature.
See this answer for a more elaborate description of the lift generation.