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For a bluff body such as a circular cylinder at moderate Reynolds number, the drag is dominated by

  • A.Pressure drag from the separated wake
  • B.Skin-friction drag
  • C.Induced drag
  • D.Wave drag

Answer: A

The flow separates near the shoulder and leaves a broad wake at roughly base pressure, so the front of the cylinder is pushed much harder than the rear. That imbalance dwarfs the friction contribution, and it is why a cylinder's drag coefficient is an order of magnitude above a streamlined strut's.

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