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Explore how variations in free-stream velocity influence boundary layer development in this 52-minute lecture on boundary layer separation. Examine the relationship between external flow conditions and boundary layer thickness, observing how the boundary layer thickens in decelerating external flows while thinning in accelerating flows. Analyze the behavior of cross-stream (wall-normal) velocity within the boundary layer under decelerating conditions, noting how it increases and tends toward unbounded values as the flow approaches the separation point. Investigate the critical phenomenon of boundary layer separation, where wall shear stress vanishes and Prandtl's boundary layer approximation breaks down, marking a fundamental transition in fluid flow behavior.
