(Book 16.4)
At high Reynold numbers, vorticity is generated by solid surfaces in thin boundary layers. As long as these boundary layers do not separate from the walls, most of the flow field is not much affected by this vorticity.
We can describe the flow outside the regions containing vorticity using potential flow theory. We can describe the flow in the thin vorticity layers next to the surface using boundary-layer theory.
Boundary layer theory requires high Reynolds numbers. You need very different approximations for low Reynolds numbers.
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