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What will be the shape of Rankine oval when sin θ=0?(a) vertical line(b) horizontal line(c) a point(d) curveThis question was posed to me in a job interview.Enquiry is from Nonlifting Flow over Cylinder topic in portion Inviscid & Incompressible Flow of Aerodynamics

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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