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In reality, the starting vortex dies out. Why?

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In reality, the starting vortex dies out. Why?

(a) Lift becomes zero

(b) At later times, Kelvin’s theorem is not applicable

(c) Due to Viscosity

(d) This assumption is wrong. Starting vortex never dies

I got this question in examination.

This interesting question is from Kelvin’s Circulation Theorem and the Starting Vortex topic in section Incompressible Flow over Airfoils of Aerodynamics

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Best answer
The correct choice is (c) Due to Viscosity

Explanation: Starting vortex cannot form in inviscid medium. It can form only in a viscous medium. In a viscous medium, it dies instantly due to viscous effects.

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