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Methods of time-averaging statistics are applicable only to ___________

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in Computational Fluid Dynamics by (118k points)
Methods of time-averaging statistics are applicable only to ___________

(a) Free turbulent structures

(b) Boundary layer turbulent structures

(c) Coherent turbulent structures

(d) Incoherent turbulent structures

This question was addressed to me during an online interview.

Query is from Turbulence Modelling topic in division Turbulence Modelling of Computational Fluid Dynamics

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Correct option is (c) Coherent turbulent structures

To explain I would say: For a time-averaged statistic to be applicable, the turbulent structure should have temporal coherence. Though turbulent flows are chaotic, they should be resolved into coherent structures to apply these methods.

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