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Large eddies are _________

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Large eddies are _________

(a) two-dimensional and isotropic

(b) two-dimensional and isotropic

(c) three-dimensional and anisotropic

(d) two-dimensional and anisotropic

The question was asked in homework.

I need to ask this question from Turbulence Modelling in portion Turbulence Modelling of Computational Fluid Dynamics

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Right choice is (c) three-dimensional and anisotropic

Best explanation: Turbulent flows are characterized by their three-dimensional fluctuation. So, the large eddies are also three-dimensional. The flow variables highly vary in all three directions. This leads to an anisotropic nature. Especially, large eddies are highly anisotropic.

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