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LES Reynolds stresses are caused by ____________

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in Computational Fluid Dynamics by (118k points)
LES Reynolds stresses are caused by ____________

(a) Source term

(b) Resolved flow

(c) SGS eddies

(d) Diffusion term

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This interesting question is from Turbulence Modelling in division Turbulence Modelling of Computational Fluid Dynamics

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Right choice is (c) SGS eddies

The explanation: The LES Reynolds stresses are caused by the convective momentum transfer due to the interaction of the SGS stresses among themselves. These SGS stresses are modelled separately as the Reynolds stresses in the RANS equations.

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