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Pressure drag on a bluff body is largely a consequence of

  • A.The very high skin friction over the front face
  • B.The compressibility of the air at low speed
  • C.The absence of any boundary layer on the body
  • D.Flow separation leaving a low-pressure wake

Answer: D

When the flow separates, pressure recovery over the rear of the body is lost and the resulting fore-and-aft pressure difference dominates the drag. Streamlining works precisely by delaying separation so that pressure is recovered.

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