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An analysis of subgrid-resolved scale interactions with use of results from direct numerical simulations

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Abstract

Subgrid nonlinear interaction and energy transfer are analyzed using direct numerical simulations of isotropic turbulence. Influences of cutoff wave number at different ranges of scale on the energetics and dynamics have been investigated. It is observed that subgrid-subgrid interaction dominates the turbulent dynamics when cut-off wave number locates in the energy-containing range while resolved-subgrid interaction dominates if it is in the dissipation range. By decomposing the subgrid energy transfer and nonlinear interaction into ‘forward’ and ‘backward’ groups according to the sign of triadic interaction, we find that individually each group has very large contribution, but the net of them is much smaller, implying that tremendous cancellation happens between these two groups.

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Authors and Affiliations

  1. Environment, Safety and Health Division and Center for Nonlinear Studies, Los Alamos National Laboratory, 87545, Los Alamos, NM, USA

    H. Gong, S. Chen & G. W. He

  2. LNM, Institute of Mechanics, Chinese Academy of Sciences, 100080, Beijing, China

    G. W. He

Authors
  1. H. Gong
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  2. S. Chen
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  3. G. W. He
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Gong, H., Chen, S. & He, G.W. An analysis of subgrid-resolved scale interactions with use of results from direct numerical simulations. Acta Mech Sinica 15, 108–115 (1999). https://doi.org/10.1007/BF02485875

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  • DOI: https://doi.org/10.1007/BF02485875

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