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Surface oil-flow visualisation reveals

  • A.The pattern of skin-friction lines
  • B.The density field around the model
  • C.The stagnation temperature distribution
  • D.The turbulence spectrum of the free stream

Answer: A

A thin oil film is dragged along by the surface shear, so when it dries it records the skin-friction line pattern. Separation and reattachment lines, transition fronts and vortex footprints all show up clearly, which makes it the standard first look at a new configuration.

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