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Title: SCALING LAWS AND DIFFUSE LOCALITY OF BALANCED AND IMBALANCED MAGNETOHYDRODYNAMIC TURBULENCE

Abstract

The search of ways to generalize the theory of strong MHD turbulence for the case of non-zero cross-helicity (or energy imbalance) has attracted considerable interest recently. In our earlier publications, we performed three-dimensional numerical simulations and showed that some of the existing models are inconsistent with numerics. In this Letter, we focused our attention on low-imbalance limit and performed new high-resolution simulations. The results strongly suggest that in the limit of small imbalances we smoothly transition to a standard Goldreich-Sridhar balanced model. We also claim that the Perez-Boldyrev model that predicts the same nonlinear timescale for both components due to the so-called dynamic alignment strongly contradicts numerical evidence.

Authors:
;  [1]
  1. Department of Astronomy, University of Wisconsin, Madison, WI 53706 (United States)
Publication Date:
OSTI Identifier:
21452747
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 722; Journal Issue: 1; Other Information: DOI: 10.1088/2041-8205/722/1/L110; Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COMPUTERIZED SIMULATION; HELICITY; LOCALITY; MAGNETOHYDRODYNAMICS; NONLINEAR PROBLEMS; SCALING LAWS; THREE-DIMENSIONAL CALCULATIONS; TURBULENCE; FLUID MECHANICS; HYDRODYNAMICS; MECHANICS; PARTICLE PROPERTIES; SIMULATION

Citation Formats

Beresnyak, A, and Lazarian, A. SCALING LAWS AND DIFFUSE LOCALITY OF BALANCED AND IMBALANCED MAGNETOHYDRODYNAMIC TURBULENCE. United States: N. p., 2010. Web. doi:10.1088/2041-8205/722/1/L110.
Beresnyak, A, & Lazarian, A. SCALING LAWS AND DIFFUSE LOCALITY OF BALANCED AND IMBALANCED MAGNETOHYDRODYNAMIC TURBULENCE. United States. https://doi.org/10.1088/2041-8205/722/1/L110
Beresnyak, A, and Lazarian, A. Sun . "SCALING LAWS AND DIFFUSE LOCALITY OF BALANCED AND IMBALANCED MAGNETOHYDRODYNAMIC TURBULENCE". United States. https://doi.org/10.1088/2041-8205/722/1/L110.
@article{osti_21452747,
title = {SCALING LAWS AND DIFFUSE LOCALITY OF BALANCED AND IMBALANCED MAGNETOHYDRODYNAMIC TURBULENCE},
author = {Beresnyak, A and Lazarian, A},
abstractNote = {The search of ways to generalize the theory of strong MHD turbulence for the case of non-zero cross-helicity (or energy imbalance) has attracted considerable interest recently. In our earlier publications, we performed three-dimensional numerical simulations and showed that some of the existing models are inconsistent with numerics. In this Letter, we focused our attention on low-imbalance limit and performed new high-resolution simulations. The results strongly suggest that in the limit of small imbalances we smoothly transition to a standard Goldreich-Sridhar balanced model. We also claim that the Perez-Boldyrev model that predicts the same nonlinear timescale for both components due to the so-called dynamic alignment strongly contradicts numerical evidence.},
doi = {10.1088/2041-8205/722/1/L110},
url = {https://www.osti.gov/biblio/21452747}, journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 1,
volume = 722,
place = {United States},
year = {2010},
month = {10}
}