Discussion
Consider the following statements about drag on a bluff body:
1. Pressure drag dominates over skin friction.
2. Streamlining reduces the total drag despite increasing the wetted area.
3. The drag coefficient is independent of Reynolds number at all speeds.
Which of the statements given above is or are correct?
Answer: C
The first two are correct. The third ignores the drag crisis, at which the coefficient of a sphere or cylinder falls abruptly by a factor of several as the layer goes turbulent. Far from being independent, it is strongly Reynolds-number dependent there.
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