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Title: Ideal evolution of magnetohydrodynamic turbulence when imposing Taylor-Green symmetries

Journal Article · · Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
 [1];  [2];  [3];  [4];  [5];  [5]
  1. Centre National de la Recherche Scientifique (CNRS), Paris (France). Lab. de Physique Statistique de l'École Normale Supérieure
  2. Univ. College Dublin, Dublin (Ireland). School of Mathematical Sciences
  3. Centre National de la Recherche Scientifique (CNRS), Paris (France)
  4. National Center for Atmospheric Research, Boulder, CO (United States). Computational and Information Systems Lab.; Univ. of Buenos Aires (Argentina). Dept. de Física
  5. National Center for Atmospheric Research, Boulder, CO (United States). Computational and Information Systems Lab.

We investigate the ideal and incompressible magnetohydrodynamic (MHD) equations in three space dimensions for the development of potentially singular structures. The methodology consists in implementing the fourfold symmetries of the Taylor-Green vortex generalized to MHD, leading to substantial computer time and memory savings at a given resolution; we also use a regridding method that allows for lower-resolution runs at early times, with no loss of spectral accuracy. One magnetic configuration is examined at an equivalent resolution of $6144^3$ points and three different configurations on grids of $4096^3$ points. At the highest resolution, two different current and vorticity sheet systems are found to collide, producing two successive accelerations in the development of small scales. At the latest time, a convergence of magnetic field lines to the location of maximum current is probably leading locally to a strong bending and directional variability of such lines. A novel analytical method, based on sharp analysis inequalities, is used to assess the validity of the finite-time singularity scenario. This method allows one to rule out spurious singularities by evaluating the rate at which the logarithmic decrement of the analyticity-strip method goes to zero. The result is that the finite-time singularity scenario cannot be ruled out, and the singularity time could be somewhere between $t = 2.33$ and $t = 2.70$. More robust conclusions will require higher resolution runs and grid-point interpolation measurements of maximum current and vorticity.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1565059
Alternate ID(s):
OSTI ID: 1101982
Journal Information:
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics, Vol. 87, Issue 1; ISSN 1539-3755
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (9)

Evidence for Bolgiano-Obukhov scaling in rotating stratified turbulence using high-resolution direct numerical simulations journal May 2015
Generation of turbulence through frontogenesis in sheared stratified flows journal August 2018
Equilibria, Dynamics, and Current Sheet Formation in Magnetically Confined Coronae journal December 2015
Finite-time singularities and flow regularization in a hydromagnetic shell model at extreme magnetic Prandtl numbers journal July 2015
Turbulent cascade, bottleneck, and thermalized spectrum in hyperviscous flows journal February 2020
Coronal Heating Topology: The Interplay of Current Sheets and Magnetic Field Lines journal July 2017
Equilibria, Dynamics and Current Sheets Formation in Magnetically Confined Coronae text January 2015
Coronal Heating Topology: the Interplay of Current Sheets and Magnetic Field Lines text January 2017
Generation of turbulence through frontogenesis in sheared stratified flows preprint January 2017

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