### Session HA: Turbulence Theory II

10:30 AM–12:40 PM, Monday, November 22, 2010
Long Beach Convention Center Room: 101A

Chair: Robert Rubinstein, NASA Langley

Abstract ID: BAPS.2010.DFD.HA.4

### Abstract: HA.00004 : On a self-sustaining process at large scale in the turbulent channel flow

11:09 AM–11:22 AM

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#### Authors:

Yongyun Hwang
(Laboratoire d'hydrodynamique, Ecole polytechnique, France)

Carlo Cossu
(Institut de Mecanique des Fluides de Toulouse (IMFT), France)

The near-wall region of wall-bounded turbulent flows has been understood as the place where an independent self-sustaining cycle exists, and the associated coherent motions in this region have been rigorously described with traveling waves and/or unstable periodic orbits in the phase space. On the other hand, in the outer region, turbulent motions have often been thought to be produced from the active near-wall cycles via so called the `bottom-up' process. However, recent investigations revealed that outer layer motions can experience significant non-normal amplifications. These findings suggest that self-sustaining processes could also exist at large scale. In this study, we consider a fully-developed turbulent channel at $Re_\tau \approx 550$. We show that large-scale and very-large-scale motions in the outer region can sustain even when smaller-scale structures in the near-wall and the logarithmic regions are artificially quenched. The self-sustaining process is active only at the lengths scales larger than $L_x \times L_z \approx 3h \times 1.5h$, in good accordance with the most energetic length scales observed in the outer region.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.DFD.HA.4