Self-organization in turbulence as a route to order in plasma and fluids

Details Self-organization in turbulence as a route to order in plasma and fluids Self-organization in turbulence as a route to order in plasma and fluids

2004-09-16

arxiv.org/abs/physics/0409074v1

Physical Review E, 71, 046409 (2005)

Physics

Plasma Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevE.71.046409

Transitions from turbulence to order are studied experimentally in thin fluid layers and magnetically confined toroidal plasma. It is shown that turbulence self-organizes through the mechanism of spectral condensation. The spectral redistribution of the turbulent energy leads to the reduction in the turbulence level, generation of coherent flow, reduction in the particle diffusion and increase in the system's energy. The higher order state is sustained via the nonlocal spectral coupling of the linearly unstable spectral range to the large-scale mean flow. The similarity of self-organization in two-dimensional fluids and low-to-high confinement transitions in plasma suggests the universality of the mechanism.

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