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The mean of the spatial partial derivative of a flow variable will be equal to ____________

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The mean of the spatial partial derivative of a flow variable will be equal to ____________

(a) 0

(b) 1

(c) the spatial partial derivative of the mean component

(d) the mean component

The question was asked in an interview for internship.

My query is from Turbulence Modelling topic in chapter Turbulence Modelling of Computational Fluid Dynamics

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Correct answer is (c) the spatial partial derivative of the mean component

Explanation: The mean of the flow variable will be equal to the mean variable. The mean of the flow variable’s spatial partial derivative will be equal to the spatial partial derivative of the mean component of that variable.

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