Discussion
Assertion (A): The drag crisis causes a sphere's drag to fall even though its skin friction rises.
Reason (R): The transition to turbulence delays separation and narrows the wake.
Select the correct answer from the options below.
Answer: A
Both are true and the second explains the first. For a bluff body the pressure drag from the wake dwarfs the friction term, so narrowing the wake outweighs the extra shear many times over. The drag coefficient can drop by a factor of five through the transition.
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