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What is the lift on the cylinder?

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in Aerodynamics by (773k points)
What is the lift on the cylinder?

(a) One

(b) Zero

(c) Negative

(d) Greater than zero

This question was posed to me during an internship interview.

The above asked question is from Lifting Flow over Cylinder in division Inviscid & Incompressible Flow of Aerodynamics

1 Answer

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Best answer
Correct choice is (b) Zero

Easy explanation: Pressure distribution over the top half of the cylinder is equal to the pressure distribution over the bottom half and hence the lift must be zero. The air flows on the cylinder is deflected the same amount upward as the flow is deflected downwards at the rear of the cylinder. So the up wash equalizes the downwash in terms of resulting reaction forces. In the end, the free stream hasn’t been deflected at all but still, lift exists.

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