On a self-sustained process at large scale in the turbulent channel flow

Details On a self-sustained process at large scale in the turbulent channel flow On a self-sustained process at large scale in the turbulent channel flow

2010-04-23

arxiv.org/abs/1004.4177v1

Revised for publication in Phys. Rev. Lett. 2010

Physics

Fluid Dynamics

Scientific paper

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.

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