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A shock wave interacting with a boundary layer characteristically causes

  • A.Complete removal of the boundary layer
  • B.A reduction in the boundary layer thickness
  • C.Thickening and often separation of the boundary layer
  • D.Immediate transition to laminar flow

Answer: C

The sharp adverse pressure gradient imposed by the shock is felt by the already slow fluid near the wall, which thickens and frequently separates. The interaction feeds back on the shock itself, smearing it into a lambda foot. It is a major source of buffet and drag on transonic wings.

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