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Related Experiment Videos

Coherent structure phenomena in drift wave-zonal flow turbulence

Smolyakov1, Diamond, Malkov

  • 1Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, S7N 5E2 Canada.

Physical Review Letters
|October 4, 2000
PubMed
Summary
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Zonal flows, plasma potential perturbations, can evolve into long-lived structures. These structures explain intermittency in drift-wave turbulence and reduced anomalous transport.

Area of Science:

  • Plasma physics
  • Fluid dynamics
  • Nonlinear dynamics

Background:

  • Zonal flows arise from drift-wave turbulence.
  • They are azimuthally symmetric plasma potential perturbations.
  • Reynolds stresses drive their generation.

Purpose of the Study:

  • Investigate the nonlinear evolution of zonal flows.
  • Identify the formation of coherent structures.
  • Understand their role in drift-wave turbulence intermittency.

Main Methods:

  • Analysis of nonlinear evolution.
  • Identification of self-bound wave packets.
  • Study of stationary shear layers.

Main Results:

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  • Zonal flows exhibit nonlinear evolution beyond initial growth.
  • Long-lived coherent structures are formed.
  • These structures are self-bound wave packets with stationary shear layers.
  • Reduced anomalous transport regions are intermittently distributed.

    • Conclusions:

    • Coherent zonal flow structures are key to understanding intermittency in drift-wave turbulence.
    • These structures dynamically regulate anomalous transport.