The mean of the product of the mean component of one variable and the fluctuating component of another variable is ____________(a) 1(b) 0(c) the product of their mean components(d) the product of their fluctuating componentsI had been asked this question in a job interview.My question is taken from Turbulence Modelling in chapter Turbulence Modelling of Computational Fluid Dynamics

The mean of the product of the mean component of one variable and the

1.	The mean of the product of the mean component of one variable and the fluctuating component of another variable is ____________(a) 1(b) 0(c) the product of their mean components(d) the product of their fluctuating componentsI had been asked this question in a job interview.My question is taken from Turbulence Modelling in chapter Turbulence Modelling of Computational Fluid Dynamics
Answer» CORRECT ANSWER is (b) 0 The best I can explain: The mean of a FLUCTUATING component is zero. The mean of a mean component is a VARIABLE. So, the mean of the product of the mean component of one variable and the fluctuating component of ANOTHER variable will become zero.

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