Evolution of the magnetic field generated by the Kelvin-Helmholtz instability

Modestov, Mikhail; Bychkov, Vitaly; Brodin, Gert; Marklund, Mattias; Brandenburg, Axel

doi:10.1063/1.4891340

Cited by 6 publications

(1 citation statement)

References 34 publications

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“…For instance, in Earth's aurora (Hallinan & Davis 1970), stellar jets and outflows (Keppens et al 1999), supernova remnants (Wang & Chevalier 2001), protoplanetary disks (Gómez & Ostriker 2005), molecular clouds (Shadmehri & Downes 2007), coronal mass ejections (Foullon et al 2011) and solar spicules (Antolin et al 2018). Its relevance for the research presented in this work resides in the fact that the motions that develop during its evolution allow for the operation of the Biermann battery (Modestov et al 2014) and dynamo (Zhang et al 2009) mechanisms.…”

Section: Introductionmentioning

confidence: 97%

Simulations of the Biermann battery mechanism in two-fluid partially ionised plasmas

Martínez‐Gómez

Braileanu

Khomenko

et al. 2021

A&A

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Context. In the absence of an initial seed, the Biermann battery term of a non-ideal induction equation acts as a source that generates weak magnetic fields. These fields are then amplified via a dynamo mechanism. The Kelvin-Helmholtz instability is a fluid phenomenon that takes place in many astrophysical scenarios and can trigger the action of the Biermann battery and dynamo processes. Aims. We aim to investigate the effect of the ionisation degree of the plasma and the interaction between the charged and neutral species on the generation and amplification of magnetic fields during the different stages of the instability. Methods. We use the two-fluid model implemented in the numerical code Mancha-2F. We perform 2D simulations starting from a configuration with no initial magnetic field and which is unstable due to a velocity shear. We vary the ionisation degree of the plasma and we analyse the role that the different collisional terms included in the equations of the model play on the evolution of the instability and the generation of magnetic field. Results. We find that when no collisional coupling is considered between the two fluids, the effect of the Biermann battery mechanism does not depend on the ionisation degree. However, when elastic collisions are taken into account, the generation of magnetic field is increased as the ionisation degree is reduced. This behaviour is slightly enhanced if the process of charge-exchange is also considered. We also find a dependence on the total density of the plasma related to the dependence on the coupling degree between the two fluids. As the total density is increased, the results from the two-fluid model converge to the predictions of single-fluid models. Conclusions. The charged-neutral interaction in a partially ionised plasmas has a non-negligible effect on the Biermann battery mechanism and it effectively enhances the generation of a magnetic field. In addition, single-fluid models, which assume a very strong coupling between the two species, may overestimate the contribution of this interaction in comparison with two-fluid models.

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Section: Introductionmentioning

confidence: 97%

Simulations of the Biermann battery mechanism in two-fluid partially ionised plasmas

Martínez‐Gómez

Braileanu

Khomenko

et al. 2021

A&A

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Combustion phenomena in modern physics: I. Inertial confinement fusion

Bychkov

Modestov

Law

2015

Progress in Energy and Combustion Science

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Construction and validation of a statistical model for the nonlinear Kelvin-Helmholtz instability under compressible, multimode conditions

et al. 2018

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A new model for the evolution of compressible, multimode Kelvin-Helmholtz (KH) instability is presented. The model is built upon compressible single vortex evolution and two-vortex interaction, resulting in a statistical description of the compressible KH mixing zone evolution. These two building blocks, which, due to complicated compressibility effects and the presence of shock waves, cannot be derived using simple flow models, are validated by novel supersonic high-energy-density physics experiments. The model was validated against numerical simulations, experimental results, and previous phenomenological models, confirming the compressible KH scaling law in the self-similar regime in good agreement with simulations and a compilation of experimental data. Moreover, the model extends and confirms the logical validity of previous work, done in the incompressible regime. Therefore, it sheds new light on the evolution of compressible shear layers up to the self-similar regime.

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Evolution of the magnetic field generated by the Kelvin-Helmholtz instability

Cited by 6 publications

References 34 publications

Simulations of the Biermann battery mechanism in two-fluid partially ionised plasmas

Simulations of the Biermann battery mechanism in two-fluid partially ionised plasmas

Combustion phenomena in modern physics: I. Inertial confinement fusion

Construction and validation of a statistical model for the nonlinear Kelvin-Helmholtz instability under compressible, multimode conditions

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