Question

What are the methods of averaging used to?

(a) To decompose the flow variable

(b) To get the mean component of the flow variable

(c) To get the remove the fluctuating component

(d) To solve the flow variables

The question was asked during an online exam.

My question is from Turbulence Modelling in chapter Turbulence Modelling of Computational Fluid Dynamics

Answer 1

Right choice is (b) To get the mean component of the flow variable

For explanation I would say: By Reynolds decomposition, the flow variables are decomposed into mean and fluctuating components. These methods of averaging are used to get the mean component during this decomposition.