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

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in Computational Fluid Dynamics by (118k points)
Which of these assumptions is made in the Smagorinsky-Lilly SGS model?

(a) The changes in the flow direction are slow in the resolved flow

(b) The changes in the cross-stream direction are slow in the resolved flow

(c) The changes in the flow direction are slow in the SGS eddies

(d) The changes in the cross-stream direction are slow in the SGS eddies

I got this question in a national level competition.

This is a very interesting question from Turbulence Modelling in portion Turbulence Modelling of Computational Fluid Dynamics

1 Answer

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by (65.4k points)

The correct answer is:

(a) The changes in the flow direction are slow in the resolved flow

In the Smagorinsky-Lilly subgrid-scale (SGS) model, it is assumed that the changes in the flow direction are slow in the resolved flow. This allows the model to approximate the effects of unresolved, smaller-scale turbulence based on the strain rate of the resolved flow.

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