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Large-scale intermittency and rare events boosted at dimensional crossover in anisotropic turbulence

Keiko Takahashi1, Koji Goto2, Ryo Onishi1, and Masatoshi Imada3

  • 1Center for Earth Information Science and Technology, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan
  • 21st Government and Public Solutions Division, NEC Corporation, 7-1 Shiba 5-chome, Minato-ku, Tokyo 108-8001, Japan
  • 3Department of Applied Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan

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Phys. Rev. Fluids 3, 124607 – Published 21 December, 2018

DOI: https://doi.org/10.1103/PhysRevFluids.3.124607

Abstract

Understanding rare events in turbulence provides a basis for the science of extreme weather, for which the atmosphere is modeled by Navier-Stokes equations (NSEs). In solutions of NSEs for isotropic fluids, various quantities, such as fluid velocities, roughly follow Gaussian distributions, where extreme events are prominent only in small-scale quantities associated with the dissipation-dominating length scale or anomalous scaling regime. Using numerical simulations, this study reveals another universal promotion mechanism at much larger scales if three-dimensional fluids accompany strong two-dimensional anisotropies, as is the case in the atmosphere. The dimensional crossover between two and three dimensions generates prominent fat-tailed non-Gaussian distributions with intermittency accompanied by colossal chainlike structures with densely populated self-organized vortices (serpentinely organized vortices). The promotion is caused by a sudden increase of the available phase space at the crossover length scale. Since the discovered intermittency can involve much larger energies than those in the conventional intermittency in small spatial scales, it governs extreme events and chaotic unpredictability in the synoptic weather system.

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Phys. Rev. Fluids 3, 124607– Published 21 December, 2018
  • Received 19 February 2018
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