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How the cylinder will vibrate in the wind tunnel test?

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How the cylinder will vibrate in the wind tunnel test?

(a) Due to high pressure

(b) Due to low pressure

(c) Due to relative pressure

(d) Due to fluctuations in the flow

I had been asked this question in unit test.

I need to ask this question from Lifting Flow over Cylinder topic in division Inviscid & Incompressible Flow of Aerodynamics

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Right option is (d) Due to fluctuations in the flow

The explanation: The difference in pressure is caused by the periodic separation of flow over the surface of the cylinder. Periodic separation induces fluctuations in the flow and makes cylinder vibrate in the wind tunnel.

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