Discussion
Consider the following statements about the drag crisis on a sphere:
1. It is caused by transition of the boundary layer to turbulence.
2. The drag coefficient falls sharply as it occurs.
3. The skin friction falls as it occurs.
Which of the statements given above is or are correct?
Answer: A
The first two are correct. The third is false: the skin friction actually rises when the layer goes turbulent. What falls, and falls far more, is the pressure drag, because the separation point moves aft and the wake narrows.
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