Abstract
Direct numerical simulation of a turbulent channel flow at Reτ=180 is used to analyze the resolved enstrophy dissipation caused by the subgrid-scale (SGS) models. The SGS enstrophy dissipation attains a minimum (forward scatter) at about y+≈8 and a backscatter region for y+<6, and is correlated with the high-speed streaks. A priori tests show that in the buffer layer, of all the models considered, the dynamic Smagorinsky, filtered structure function, and scale-similarity models display the smallest amount of resolved enstrophy dissipation, whereas the Smagorinsky and mixed models are the most dissipative.
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