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

Published online by Cambridge University Press:  03 November 2017

D. Bond Open the ORCID record for D. Bond [Opens in a new window] ,
V. Wheatley ,
R. Samtaney  and
D. I. Pullin
D. Bond
Affiliation:
Centre for Hypersonics, School of Mechanical and Mining Engineering, The University of Queensland, St Lucia Qld 4072, Australia
V. Wheatley
Affiliation:
Centre for Hypersonics, School of Mechanical and Mining Engineering, The University of Queensland, St Lucia Qld 4072, Australia
R. Samtaney
Affiliation:
Mechanical Engineering, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
D. I. Pullin
Affiliation:
Graduate Aerospace laboratories, California Institute of Technology, Pasadena, CA 91125, USA
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Abstract

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.

JFM classification

Instability: Instability MHD and Electrohydrodynamics: MHD and Electrohydrodynamics
Type
Papers
Information
Journal of Fluid Mechanics , Volume 833 , 25 December 2017 , pp. 332 - 363
Copyright
© 2017 Cambridge University Press 

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