期刊
出版社
ROYAL SOC
DOI: 10.1098/rsta.2016.0088
关键词
wall turbulence; coherent lift-up; self-sustaining processes; attached eddies
资金
- Ecole polytechnique
- PSA-Automobiles
- PRES Universite de Toulouse
- Region Midi-Pyrenees
- Engineering and Physical Science Research Council (EPSRC) in UK [EP/N019342/1]
- EPSRC [EP/N019342/1] Funding Source: UKRI
We collect and discuss the results of our recent studies which show evidence of the existence of a whole family of self-sustaining motions in wall-bounded turbulent shear flows with scales ranging from those of buffer-layer streaks to those of large-scale and very-large-scale motions in the outer layer. The statistical and dynamical features of this family of self-sustaining motions, which are associated with streaks and quasi-streamwise vortices, are consistent with those of Townsend's attached eddies. Motions at each relevant scale are able to sustain themselves in the absence of forcing from larger-or smaller-scale motions by extracting energy from the mean flow via a coherent lift-up effect. The coherent self-sustaining process is embedded in a set of invariant solutions of the filtered Navier-Stokes equations which take into full account the Reynolds stresses associated with the residual smaller-scale motions. This article is part of the themed issue 'Toward the development of high-fidelity models of wall turbulence at large Reynolds number'.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据