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1. G. Ghorbaniasl, V. Agnihotri, and C. Lacor, “A self-adjusting flow dependent formulation for the classical Smagorinsky model coefficient,” Phys. Fluids 25, 055102 (2013).
2. L. Fang, L. Shao, J. P. Bertoglio, L. P. Lu, and Z. S. Zhang, “The rapid-slow decomposition of the subgrid flux in inhomogeneous scalar turbulence,” J. Turbul. 12(8), 123 (2011).

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In this comment, we show that the novel formulation of the Smagorinsky model coefficient, proposed by Ghorbaniasl et al. [Phys. Fluids25, 055102 (2013)], satisfies neither the Galilean invariance nor the coordinate invariance, thus does not have physical significance. We conclude that their model is just to provide a coordinate-system-dependent dissipation term.


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