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Is unsteady vortices appears at turbulent flow?

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Is unsteady vortices appears at turbulent flow?

(a) True

(b) False

I got this question during a job interview.

I'm obligated to ask this question of Turbulent Flow in section Incompressible Flow over Airfoils of Aerodynamics

1 Answer

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Right option is (a) True

The explanation: In turbulent flow, unsteady vortices appears of many sizes which interact with each other, consequently drag due to friction effects increases. This would increase the energy needed to pump fluid through a pipe, for instance.

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