Richtmyer–Meshkov instability of a thermal interface in a two-fluid plasma

We computationally investigate the Richtmyer–Meshkov instability of a density interface with a single-mode perturbation in a two-fluid, ion–electron plasma with no initial magnetic field. Self-generated magnetic fields arise subsequently. We study the case where the density jump across the initial i...

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Bibliographic Details
Published inJournal of fluid mechanics Vol. 833; pp. 332 - 363
Main Authors Bond, D., Wheatley, V., Samtaney, R., Pullin, D. I.
Format Journal Article
LanguageEnglish
Published Cambridge, UK Cambridge University Press 25.12.2017
Subjects
Density
Electromagnetic fields
Electron plasma
Electrons
Evolution
Fluid mechanics
Fluids
Hydrodynamics
Instability
Interface stability
Interfaces
Magnetic field
Magnetic fields
Plasma
Simulation
Structural stability
Studies
Taylor instability
instability
MHD and electrohydrodynamics
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Summary:We computationally investigate the Richtmyer–Meshkov instability of a density interface with a single-mode perturbation in a two-fluid, ion–electron plasma with no initial magnetic field. Self-generated magnetic fields arise subsequently. We study the case where the density jump across the initial interface is due to a thermal discontinuity, and select plasma parameters for which two-fluid plasma effects are expected to be significant in order to elucidate how they alter the instability. The instability is driven via a Riemann problem generated precursor electron shock that impacts the density interface ahead of the ion shock. The resultant charge separation and motion generates electromagnetic fields that cause the electron shock to degenerate and periodically accelerate the electron and ion interfaces, driving Rayleigh–Taylor instability. This generates small-scale structures and substantially increases interfacial growth over the hydrodynamic case.
ISSN:0022-1120
1469-7645
DOI:10.1017/jfm.2017.693