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A tunnel intended for automotive testing usually incorporates a moving ground plane because

  • A.It removes the need for a balance
  • B.A fixed floor grows its own boundary layer
  • C.It reduces the drive power required
  • D.It allows supersonic testing

Answer: B

On a real road the ground moves with the vehicle and carries no boundary layer relative to it. A fixed tunnel floor grows one, corrupting the underbody flow and the wheel wakes, so a rolling belt and boundary-layer suction ahead of it are used to reproduce the true condition.

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