Discussion
Prandtl's boundary-layer hypothesis states that viscous effects at high Reynolds number are confined to
Answer: A
Prandtl's 1904 insight was that at high Reynolds number the viscous terms matter only very near the wall, leaving the rest of the flow effectively inviscid. That division is what makes aerodynamics tractable: potential flow outside, a boundary-layer calculation within, and the two matched at their common edge.
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