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What will be the shape of Rankine oval when sin θ=0?

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in Aerodynamics by (773k points)
What will be the shape of Rankine oval when sin θ=0?

(a) vertical line

(b) horizontal line

(c) a point

(d) curve

This question was posed to me in a job interview.

Enquiry is from Nonlifting Flow over Cylinder topic in portion Inviscid & Incompressible Flow of Aerodynamics

1 Answer

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Best answer
Correct choice is (b) horizontal line

To explain: The shape of the Rankine oval of equal axes can be given by substituting the stream function as zero in the equation Ψ = U*y + ((-u/2*pi*r)*sin θ. When sin θ=0, θ=0, then a horizontal line through the origin of the doublet is formed and it is x-axis.

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