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When velocity potential (ϕ) exits, the flow is _________

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When velocity potential (ϕ) exits, the flow is _________

(a) rotational

(b) irrotational

(c) laminar

(d) turbulent

I have been asked this question during an online interview.

This intriguing question originated from Source Flow topic in portion Inviscid & Incompressible Flow of Aerodynamics

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Correct option is (b) irrotational

Explanation: When the rotational components are zero, it means that the flow travels in a linear direction and the velocity potential gives the direction of fluid velocity in a particular direction. In irrotational flow, the velocity of the fluid travels in a linear direction.

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