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Which of these properties of turbulence is ruled out in Reynolds averaged equations?

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Which of these properties of turbulence is ruled out in Reynolds averaged equations?

(a) Fluctuations

(b) Turbulence

(c) Non-linearity

(d) Randomness

I have been asked this question during an online interview.

Enquiry is from Turbulence Modelling in division Turbulence Modelling of Computational Fluid Dynamics

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Best answer
Right answer is (a) Fluctuations

Best explanation: The flow properties of turbulent flow can be decomposed into mean and fluctuating components. These fluctuating components result in an unsteadiness in the flow. This unsteadiness is ruled out by means of Reynolds averaging.

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