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The averaging interval in RANS equation is based on ____________

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in Computational Fluid Dynamics by (118k points)
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 problem

I have been asked this question in an interview.

Origin of the question is Turbulence Modelling in chapter Turbulence Modelling of Computational Fluid Dynamics

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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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