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Is drag coefficient of the airfoil is affected by viscous effect?

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in Aerodynamics by (773k points)
Is drag coefficient of the airfoil is affected by viscous effect?

(a) True

(b) False

I got this question in an interview for internship.

This interesting question is from Viscous Flow topic in portion Incompressible Flow over Airfoils of Aerodynamics

1 Answer

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Best answer
The correct option is (a) True

The best explanation: Some shapes have less drag than others. The drag coefficient is seen to the first drop with lift, then rise. These phenomena cannot be explained on the basis of inviscid potential flow theory which will cause the viscous effect.

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