Inverse Interscale Transport of the Reynolds Shear Stress in Plane Couette Turbulence

Takuya Kawata, P. Henrik Alfredsson

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Interscale interaction between small-scale structures near the wall and large-scale structures away from the wall plays an increasingly important role with increasing Reynolds number in wall-bounded turbulence. While the top-down influence from the large- to small-scale structures is well known, it has been unclear whether the small scales near the wall also affect the large scales away from the wall. In this Letter we show that the small-scale near-wall structures indeed play a role to maintain the large-scale structures away from the wall, by showing that the Reynolds shear stress is transferred from small to large scales throughout the channel. This is in contrast to the turbulent kinetic energy transport which is from large to small scales. Such an "inverse" interscale transport of the Reynolds shear stress eventually supports the turbulent energy production at large scales.

Original languageEnglish
Article number244501
JournalPhysical review letters
Volume120
Issue number24
DOIs
Publication statusPublished - 2018 Jun 12
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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