Locality and universality in gyrokinetic turbulence

Bogdan Teaca, Alejandro Bañón Navarro, Frank Jenko, Stephan Brunner, Laurent Villard

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The nature of nonlinear interactions in gyrokinetic turbulence, driven by the ion-temperature gradient instability, is investigated using direct numerical simulations in toroidal flux tube geometry. To account for the level of separation existing between scales involved in an energetic interaction, the degree of locality of the free energy scale flux is analyzed employing Kraichnan's infrared (IR) and ultraviolet locality functions. Because of the nontrivial dissipative nature of gyrokinetic turbulence, an asymptotic level for the locality exponents, indicative of a universal dynamical regime for gyrokinetics, is not recovered and an accentuated nonlocal behavior of the IR interactions is found instead, in spite of the local energy cascade observed.

Original languageEnglish
Article number235003
JournalPhysical Review Letters
Volume109
Issue number23
DOIs
Publication statusPublished - 5 Dec 2012
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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