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Extreme events in computational turbulence.

P K Yeung1, X M Zhai2, Katepalli R Sreenivasan3

  • 1Schools of Aerospace Engineering and Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332;

Proceedings of the National Academy of Sciences of the United States of America
|October 2, 2015
PubMed
Summary

Largest direct numerical simulations reveal extreme turbulence events are short-lived and "chunky," unlike typical vortex tubes. Extreme energy dissipation and enstrophy occur together in these intense, transient phenomena.

Keywords:
extreme eventsfluid dynamicsintermittencypetascale computingturbulence

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Area of Science:

  • Fluid Dynamics
  • Computational Physics

Background:

  • Understanding turbulence small-scale structure is crucial.
  • Previous simulations were limited in resolution.

Purpose of the Study:

  • To perform the largest direct numerical simulations of homogeneous and isotropic turbulence.
  • To investigate the nature and evolution of extreme events in turbulence.

Main Methods:

  • Direct numerical simulations (DNS) on an 8,192(3) grid.
  • Analysis of statistical properties and temporal evolution of extreme events.

Main Results:

  • Extreme events exhibit a
  • chunky
  • structure, differing from the tubular vorticity of moderate events.
  • Extreme magnitudes of energy dissipation rate and enstrophy are spatially colocated and co-evolve.
  • These extreme events are generally short-lived.

Conclusions:

  • Extreme turbulence events possess distinct structural and temporal characteristics.
  • The findings advance the understanding of turbulence intermittency and small-scale dynamics.