Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Large scale instabilities in two-dimensional magnetohydrodynamics

Boffetta1, Celani, Prandi

  • 1Dipartimento di Fisica Generale, Universita di Torino, via Pietro Giuria 1, 10125 Torino, ItalyINFM, Unita di Torino, Torino, Italy.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|November 23, 2000
PubMed
Summary

A sheared magnetic field becomes unstable at high Reynolds numbers, leading to magnetic island coalescence. This study derives expressions for eddy-viscosity and eddy-resistivity, confirming findings with numerical simulations.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Inverse energy cascade in two-dimensional turbulence: deviations from gaussian behavior

Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics·2000
Same author

Universality and saturation of intermittency in passive scalar turbulence

Physical review letters·2000
Same author

Occupational cancer in europe

Environmental health perspectives·1999
Same author

Growth of Noninfinitesimal Perturbations in Turbulence.

Physical review letters·1996
Same author

Predictability in systems with many characteristic times: The case of turbulence.

Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics·1996
Same author

Current Perspectives on Occupational Cancer Risks.

International journal of occupational and environmental health·1995

Area of Science:

  • Magnetohydrodynamics (MHD)
  • Plasma Physics
  • Fluid Dynamics

Background:

  • Sheared magnetic fields are fundamental in astrophysical and laboratory plasmas.
  • Understanding their stability is crucial for predicting plasma behavior and confinement.

Purpose of the Study:

  • To analyze the stability of a 2D sheared magnetic field with resistive and viscous effects.
  • To investigate the nonlinear evolution of instabilities and derive relevant transport coefficients.

Main Methods:

  • Multiple-scale analysis to study perturbations at large Reynolds numbers.
  • Derivation of exact expressions for eddy-viscosity and eddy-resistivity near the critical point.
  • High-resolution numerical simulations to validate theoretical predictions.

Related Experiment Videos

Main Results:

  • The basic state of a motionless fluid with a layered magnetic field becomes unstable to large-scale perturbations at sufficient Reynolds numbers.
  • The nonlinear phase exhibits Cahn-Hilliard-like dynamics, characterized by magnetic island coalescence.
  • Marginally unstable cases yield exact expressions for eddy-viscosity and eddy-resistivity.

Conclusions:

  • The study confirms the instability of sheared magnetic fields under specific conditions.
  • Magnetic island coalescence drives the system towards a new equilibrium state.
  • Numerical simulations quantitatively support the multiscale analysis predictions.