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The shape of Rankine oval of equal axes can be found out by substituting ______________

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The shape of Rankine oval of equal axes can be found out by substituting ______________

(a) Ψ=0

(b) Ψ=1

(c) U=0

(d) U=1

This question was posed to me in unit test.

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

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Correct answer is (a) Ψ=0

Easiest explanation: 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. This gives us two different solutions for which the shape of oval varies.

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