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Testing a model upright and then inverted is a standard technique for removing

  • A.Flow angularity errors
  • B.Blockage effects
  • C.Support interference
  • D.Reynolds number scale effects

Answer: A

Inverting the model reverses the sign of the angularity error while leaving the true aerodynamic forces unchanged, so averaging the two runs cancels it. It is a cheap and effective check, and a discrepancy between the two runs is itself a useful diagnostic.

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