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The Kinetic Analogue of the Pressure-Strain Interaction
Preprint   Open access

The Kinetic Analogue of the Pressure-Strain Interaction

Sarah A Conley, James Juno, Jason M TenBarge, M. Hasan Barbhuiya, Paul A Cassak, Gregory G Howes and Emily Lichko
ArXiv.org
Cornell University
08/12/2024
DOI: 10.48550/arxiv.2408.06508
url
https://doi.org/10.48550/arxiv.2408.06508View
Preprint (Author's original)This preprint has not been evaluated by subject experts through peer review. Preprints may undergo extensive changes and/or become peer-reviewed journal articles. Open Access

Abstract

Energy transport in weakly collisional plasma systems is often studied with fluid models and diagnostics. However, the applicability of fluid models is necessarily 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. A kinetic technique that retains all of the information in 3D-3V phase-space for the study of energy transfer between electromagnetic fields and particle kinetic energy, which is quantified by the rate of electromagnetic work per unit volume j⋅E in fluid models, is the Field- Particle Correlation (FPC) technique. This technique has demonstrated that leveraging the full information contained in phase-space can elucidate the physical mechanisms of energy transfer. This provides a significant advantage over fluid diagnostics that quantify the rate at which energy is exchanged but do not distinguish between different physical processes. A different channel of energy transport, between fluid flow energy and particle internal energy, is quantified in fluid models via the pressure-strain interaction −(P⋅∇)⋅u. Using a similar approach to that of the field-particle correlation technique, in this work we derive a kinetic analog of the pressure-strain interaction and use it alongside the field-particle correlation to analyze the flow of energy from electromagnetic fields into particle internal energy in two case studies of electron Landau damping.
Physics - Plasma Physics

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