The effects of large scales on the inertial range in high-Reynolds-number turbulence

Details The effects of large scales on the inertial range in high-Reynolds-number turbulence The effects of large scales on the inertial range in high-Reynolds-number turbulence

1999-06-24

arxiv.org/abs/chao-dyn/9906041v1

Nonlinear Sciences

Chaotic Dynamics

10 pages, 13 figures

Scientific paper

The effects of removing large scales external to the inertial range on the properties of scales within the inertial range are studied in a high-Reynolds-number turbulent flow. Structure functions of both even and odd orders are strongly affected across the entire inertial range, but odd-order moments are affected to a greater degree. In particular, the skewness of velocity increments shows a significant reduction whereas the flatness changes comparatively little. The reduction in skewness is counterbalanced essentially by the interaction between the small-scale energy and the large-scale rate of strain. The implications of these results for the conventional cascade picture are examined briefly.

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