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The shape factor of a boundary layer is defined as the ratio of

  • A.Displacement thickness to momentum thickness
  • B.Momentum thickness to displacement thickness
  • C.Boundary layer thickness to displacement thickness
  • D.Wall shear stress to dynamic pressure

Answer: A

The shape factor compares the two integral thicknesses and so describes how full the velocity profile is. A high value means a profile with little momentum near the wall and impending separation, which is why it is watched as a separation indicator in boundary-layer codes.

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