On a self-sustained process at large scale in the turbulent channel flow
Fluid Dynamics
2015-05-18 v1
Abstract
Large-scale motions, important in turbulent shear flows, are frequently attributed to the interaction of structures at smaller scale. Here we show that, in a turbulent channel at Re_{\tau} \approx 550, large-scale motions can self-sustain even when smaller-scale structures populating the near-wall and logarithmic regions are artificially quenched. This large-scale self-sustained mechanism is not active in periodic boxes of width smaller than Lz ~ 1.5h or length shorter than Lx ~ 3h which correspond well to the most energetic large scales observed in the turbulent channel.
Cite
@article{arxiv.1004.4177,
title = {On a self-sustained process at large scale in the turbulent channel flow},
author = {Yongyun Hwang and Carlo cossu},
journal= {arXiv preprint arXiv:1004.4177},
year = {2015}
}