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The essential geometric difference between a compression corner and an expansion corner in supersonic flow is that

  • A.One occurs only at high Mach number
  • B.One requires viscosity and the other does not
  • C.The surface turns into the flow, or away from it
  • D.One is sharp and the other is rounded

Answer: C

That single question, whether the wall turns into the oncoming flow or away from it, settles everything else: compression and a shock in the first case, expansion and a fan in the second. Sharpness affects only whether the waves are centred, and neither case needs viscosity.

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