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Which of the following is NOT a reason a moving ground plane is used in automotive testing?

  • A.The real road moves relative to the vehicle
  • B.Underbody and wheel wake flows are otherwise corrupted
  • C.It raises the Reynolds number of the test
  • D.A fixed floor would grow an unrepresentative boundary layer

Answer: C

The belt reproduces the correct boundary condition at the ground; it does nothing for the Reynolds number, which is set by speed, size and the fluid. The other three all describe why the fixed floor is wrong and what it spoils.

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