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Which statement about horizontal buoyancy is INCORRECT?

  • A.It results from a streamwise pressure gradient in the test section
  • B.It is caused by the growth of the wall boundary layers
  • C.It can be reduced by slightly diverging the test-section walls
  • D.It is caused by the weight of the model in the airstream

Answer: D

The name is misleading: horizontal buoyancy has nothing to do with weight. It is entirely a pressure-gradient effect, produced when the tunnel's own wall boundary layers thicken and contract the effective area along the section.

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