Self-sustained process at large scales in turbulent channel flow

Abstract : Large-scale motions, important in turbulent shear flows, are frequently attributed to the interaction of structures at smaller scales. Here we show that, in a turbulent channel at Reτ≈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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Yongyun Hwang, Carlo Cossu. Self-sustained process at large scales in turbulent channel flow. Physical Review Letters, American Physical Society, 2010, vol. 105, pp. 1-4. ⟨10.1103/PhysRevLett.105.044505⟩. ⟨hal-00925804⟩

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