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The boundary layer is the region of flow in which

  • A.The flow is always supersonic regardless of speed
  • B.No shear stress acts anywhere on the fluid
  • C.Viscous effects and velocity gradients are significant
  • D.The pressure varies most strongly across the flow

Answer: C

Viscosity retards the fluid nearest the surface, so the velocity rises from zero at the wall to the free-stream value across a thin layer. Outside that layer the flow behaves as though inviscid, which is what makes potential-flow methods useful at all.

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