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How the fluid moves on the airfoil?

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in Aerodynamics by (773k points)
How the fluid moves on the airfoil?

(a) Lower surface

(b) Upper and middle surface

(c) Upper surface

(d) Lower and upper surface

The question was posed to me during an online exam.

The doubt is from The Kutta-Joukowski Theorem topic in portion Inviscid & Incompressible Flow of Aerodynamics

1 Answer

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Best answer
The correct option is (d) Lower and upper surface

The best I can explain: Fluid moving along the lower and upper surface of the airfoil should meet at the sharp trailing edge. Since viscous dissipation prevents the fluid to turn around the sharp edge. This is known as the Kutta-Condition for real flow.

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