| 1 | AN ANALYSIS OF SUBGRID-RESOLVED SCALE INTERACTIONS WITH USE OF RESULTS FROM DIRECT NUMERICAL SIMULATIONS显示文摘Subgrid nonlinear interaction and energy transfer are analyzed usingdirect numerical simulations of isotropic turbulence. Influences of cutoff wave numberat different ranges of scale on the energetics and dynamics have been investigated.It is observed that subgrid-subgrid interaction dominates the turbulent dynamicswhen cut-off wave number locates in the energy-containing range while resolved-subgrid interaction dominates if it is in the dissipation range. By decomposing thesubgrid energy transfer and nonlinear interaction into ’forward’ and ’backward’ groupsaccording to the sign of triadic interaction, we find that individually each grouphas very large contribution, but the net of them is much smaller, implying thattremendous cancellation happens between these two groups. | H. Gong S. Chen G.W. He | 1999 | Acta Mechanica Sinica1999，15，2： | 2 |
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