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For two flows to be dynamically similar, they must match in

  • A.The material from which the body is made
  • B.Geometry and the relevant dimensionless parameters
  • C.Absolute size and absolute velocity only
  • D.The temperature of the surrounding air only

Answer: B

Geometric similarity plus equality of the governing groups, chiefly Reynolds and Mach number, guarantees that the non-dimensional flow fields are identical. Matching both at once in a tunnel is often impossible, which is the central difficulty of experimental aerodynamics.

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