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The value of mixing length depends on ____________

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The value of mixing length depends on ____________

(a) small eddies

(b) large eddies

(c) turbulence

(d) time scales

The question was asked in an internship interview.

This key question is from Mixing Length Turbulence Model topic in portion Turbulence Modelling of Computational Fluid Dynamics

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The correct answer is (c) turbulence

For explanation: The mixing length model defines the Reynolds stresses in terms of velocity gradients, mixing length and density of the fluid. Turbulence is a function of the flow. So, if the turbulence changes, the Reynolds stresses should change. This change is accounted by changing the mixing length.

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