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The displacement thickness of a boundary layer measures

  • A.The momentum lost in the layer
  • B.The thickness of the laminar sublayer
  • C.The distance the external streamlines are pushed out by the velocity deficit
  • D.The height at which the velocity first reaches the free-stream value

Answer: C

Displacement thickness is the distance the wall would have to be moved outward in a frictionless flow to pass the same mass flow that the real layer passes. It quantifies how much the boundary layer thickens the effective body shape, which is why it feeds back into the outer inviscid solution.

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