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How does a turbulent boundary layer produce swirls?

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in Fluid Mechanics by (118k points)
How does a turbulent boundary layer produce swirls?

(a) Due to random motion

(b) Collision of molecules

(c) Due to eddies

(d) Due to non-uniform cross section

I got this question during an interview.

The question is from Turbulent Boundary Layer on a Flat Plate in chapter Boundary Layer Flow & Forces on Sub-merged Bodies of Fluid Mechanics

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Correct option is (c) Due to eddies

The explanation: For a turbulent boundary layer the fluid moves in different direction producing swirls. It produces swirls due to the presence of eddies. The smooth laminar boundary layer flow breaks down and transforms to a turbulent flow.

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