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Is fluid is initially in irrotational motion?

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in Aerodynamics by (773k points)
Is fluid is initially in irrotational motion?

(a) True

(b) False

I had been asked this question during an interview.

My question is taken from Kelvin’s Circulation Theorem and the Starting Vortex topic in section Incompressible Flow over Airfoils of Aerodynamics

1 Answer

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by (720k points)
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Best answer
Correct option is (a) True

Easy explanation: An inviscid incompressible fluid of constant density move in the presence of a conservative body force. Then if a portion of the fluid is initially in irrotational motion, that portion will always be in the irrotational motion.

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