The kinetic analog of the pressure–strain interaction

S. A. Conley; J. Juno; J. M. TenBarge; M. H. Barbhuiya; P. A. Cassak; G. G. Howes; E. Lichko

doi:10.1063/5.0231200

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The kinetic analog of the pressure–strain interaction

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The kinetic analog of the pressure–strain interaction

S. A. Conley, J. Juno, J. M. TenBarge, M. H. Barbhuiya, P. A. Cassak, G. G. Howes and E. Lichko

Physics of plasmas, Vol.31(12), 122117

12/2024

DOI: 10.1063/5.0231200

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Abstract

Energy transport in weakly collisional plasma systems is often studied with fluid models and diagnostics. However, the applicability of fluid models is limited when collisions are weak or absent, and using a fluid approach can obscure kinetic processes that provide key insights into the physics of energy transport. Kinetic diagnostics retain all of the information in 3D-3V phase space and thereby reach beyond the insights of fluid models to elucidate the mechanisms responsible for collisionless energy transport. In this work, we derive the Kinetic Pressure–Strain (KPS): a kinetic analog of the pressure–strain interaction, which is the channel between flow energy density and internal energy density in fluid models. Through two case studies of electron Landau damping, we demonstrate that the KPS diagnostic can elucidate kinetic mechanisms that are responsible for energy transport in this channel, just as the related field–particle correlation is known to identify kinetic mechanisms of transport between electromagnetic field energy density and kinetic energy density in particle flows. In addition, we show that resonant electrons play a major role in transferring energy between fluid flows and internal energy during the process of Landau damping.

Details

Title: Subtitle: The kinetic analog of the pressure–strain interaction
Creators: S. A. Conley - Princeton University
J. Juno - Princeton Plasma Physics Laboratory
J. M. TenBarge - Princeton University
M. H. Barbhuiya - West Virginia University
P. A. Cassak - West Virginia University
G. G. Howes - University of Iowa
E. Lichko - University of Chicago
Resource Type: Journal article
Publication Details: Physics of plasmas, Vol.31(12), 122117
Publisher: American Institute of Physics; MELVILLE
DOI: 10.1063/5.0231200
ISSN: 1070-664X
eISSN: 1089-7674
Grant note: National Science Foundation10.13039/100000001IV A and Appendix C
The simulation framework described in Appendix B and the numerics will be published in forthcoming papers. The theory for this model was jointly developed by J. Juno, J. TenBarge, and A. Hakim (PPPL) and the numerics by J. Juno and A. Hakim. Part of this work is summarized in Sec. IV A and Appendix C. We acknowledge the contributions of A. Hakim on these aspects of the work presented here. We also acknowledge helpful conversations with M. A. Shay and H. Perera.
Language: English
Date published: 12/2024
Academic Unit: Physics and Astronomy
Record Identifier: 9984769793102771

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