The mean of the product of a flow variable and the mean component of another flow variable is ____________(a) the product of their mean components(b) the product of their fluctuating components(c) the mean of the product of their mean components(d) the mean of the product of their fluctuating componentsThe question was asked in quiz.My question is from Turbulence Modelling topic in division Turbulence Modelling of Computational Fluid Dynamics

The mean of the product of a flow variable and the mean component of a

1.	The mean of the product of a flow variable and the mean component of another flow variable is ____________(a) the product of their mean components(b) the product of their fluctuating components(c) the mean of the product of their mean components(d) the mean of the product of their fluctuating componentsThe question was asked in quiz.My question is from Turbulence Modelling topic in division Turbulence Modelling of Computational Fluid Dynamics
Answer» RIGHT option is (a) the product of their MEAN components Explanation: Consider two flow variables which can be decomposed as a=A+a’ and b=B+b’. The mean of the product of one flow variable and the mean COMPONENT of ANOTHER flow variable is REPRESENTED as aB=(A+a’)B aB=AB+a’B As a’B=0 and AB=AB, aB=AB.

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