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Express the time-scale ratio in terms of Reynolds number (Re).

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Express the time-scale ratio in terms of Reynolds number (Re).

(a) Re^-1/4

(b) Re^3/4

(c) Re^-1/2

(d) Re^1/2

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This intriguing question originated from Turbulence Modelling topic in portion Turbulence Modelling of Computational Fluid Dynamics

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The correct choice is (c) Re^-1/2

Best explanation: The ratio of time-scales is obtained using the length scale ratios. It is given by

Time-scale ratio= Re^-1/2.

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