Which of these assumptions is made in the Smagorinsky-Lilly SGS model?

Which of these assumptions is made in the Smagorinsky-Lilly SGS model? Correct Answer The changes in the flow direction are slow in the resolved flow

The Smagorinsky-Lilly SGS model is valid only if The changes in the flow direction of the resolved flow are very small that the production and dissipation of turbulence are more or less in balance The turbulent structure is isotropic.

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According to the Smagorinsky-Lilly SGS model, the SGS stresses depend on the ___________