The averaging interval in RANS equation is based on ____________(a) the grid size(b) the eddy size(c) the fluctuations(d) the time interval of the problemI have been asked this question in an interview.Origin of the question is Turbulence Modelling in chapter Turbulence Modelling of Computational Fluid Dynamics

The averaging interval in RANS equation is based on ____________(a) th

1.	The averaging interval in RANS equation is based on ____________(a) the grid size(b) the eddy size(c) the fluctuations(d) the time interval of the problemI have been asked this question in an interview.Origin of the question is Turbulence Modelling in chapter Turbulence Modelling of Computational Fluid Dynamics
Answer» Correct answer is (c) the fluctuations To explain I would say: TIME averaging is used only when the flow is steady and time-independent. The time INTERVAL TAKEN to average the fluctuations depend upon the time scale of the fluctuations itself. If this interval is large enough, the LOWER limit of the integral does not even MATTER.

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