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How many stagnation points on the oval cylinder with non-zero angle of attack?

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in Aerodynamics by (773k points)
How many stagnation points on the oval cylinder with non-zero angle of attack?

(a) Two

(b) Zero

(c) More than zero

(d) One

I got this question at a job interview.

My enquiry is from The Kutta Condition topic in chapter Incompressible Flow over Airfoils of Aerodynamics

1 Answer

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Best answer
Correct choice is (a) Two

Explanation: An oval cylinder moves with a non-zero angle of attack through the fluid there are still two stagnation points on the body. One on the underside of the cylinder, near the front edge and the other on the top side of the cylinder near the back edge. The circulation around this smooth cylinder is zero and no lift is generated, despite the positive angle of attack.

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