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Magnetically Induced Rotating Rayleigh-Taylor Instability

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Published on: March 3, 2017

Coherent Structure Formation through nonlinear interactions in 2D Magnetohydrodynamic Turbulence.

Elisa De Giorgio¹, Sergio Servidio², Pierluigi Veltri²

¹University of Calabria, Department of Physics, Rende, I-87036, Italy. elisa.degiorgio@unical.it.

Scientific Reports

|October 25, 2017

Summary

High-resolution simulations reveal that coherent structures in 2D magnetohydrodynamic (MHD) turbulence are shaped by conserved invariants. These structures exhibit intermittent behavior and may hold keys to understanding singularity formation in ideal MHD.

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Area of Science:

Plasma Physics
Fluid Dynamics
Computational Physics

Background:

Turbulent flows exhibit complex dynamics driven by nonlinear interactions.
Magnetohydrodynamics (MHD) describes electrically conducting fluids, crucial in astrophysics and fusion energy.
Understanding coherent structures is key to characterizing turbulence.

Purpose of the Study:

To analyze the formation and properties of coherent structures in 2D incompressible MHD turbulence.
To investigate the role of conserved invariants in guiding these structures.
To explore the potential connection between small-scale structures and singularity formation.

Main Methods:

High-resolution 2D magnetohydrodynamic (MHD) simulations.
Analysis of nonlinear interactions and spatial intermittent behavior.
Application of variational principles associated with conserved ideal quadratic invariants.

Main Results:

Coherent structures are formed rapidly in developed 2D MHD turbulence.
The properties of these structures are governed by the conservation of rugged invariants.
Specific spatial regions show local correlations predicted by these invariants.

Conclusions:

Small-scale coherent structures in 2D MHD turbulence are guided by conserved quantities.
These structures may provide insights into the emergence of singularities in ideal MHD.
Further investigation could link these findings to singular weak solutions in the ideal MHD limit.