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The Smagorinsky-Lilly SGS model is ___________

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The Smagorinsky-Lilly SGS model is ___________

(a) Dissipative

(b) Convective

(c) Diffusive

(d) Convective and diffusive

I have been asked this question in an interview.

My question comes from Turbulence Modelling in section Turbulence Modelling of Computational Fluid Dynamics

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Right choice is (a) Dissipative

Best explanation: The Smagorinsky-Lilly SGS model is completely dissipative. The direction of energy flow is from eddies at the resolved scale towards the sub-grid scales (SGS eddies). This is changed in the later models.

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