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___________ is the scalar function of the space and time.

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___________ is the scalar function of the space and time.

(a) velocity

(b) velocity potential function

(c) velocity vector

(d) pressure

The question was asked during an interview for a job.

Enquiry is from Source Flow in chapter Inviscid & Incompressible Flow of Aerodynamics

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Right option is (b) velocity potential function

The explanation: Velocity function is the scalar function of space and time such that its negative derivative with respect to any direction gives the fluid velocity in that direction. It is defined by phi (ϕ). Mathematically, it is given by, ϕ= f(x,y,z).

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