Analysis of sub-grid-resolved scale interactions with use of results from direct numerical simulations

• 摘要：

  Sub-grid nonlinear interaction and energy transfer were 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 sub-grid-sub-grid interaction dominates the turbulent dynamics when cut-off wave number locates in the energy-containing range while resolved-sub-grid interaction dominates if it is in the dissipation range. By decomposing the sub-grid energy transfer and nonlinear interaction into `forward' and `backward' groups according to the sign of triadic interaction, it is found 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.

• 作者：

  Gong H.;Chen S.;He G. W.

• 刊名：

  Acta Mechanica Sinica Lixue Xuebao

• 在线出版时间：

  1999