Energy transfer, pressure tensor, and heating of kinetic plasma

Yan Yang; William H. Matthaeus; Tulasi N. Parashar; Colby C. Haggerty; Vadim Roytershteyn; William Daughton; Minping Wan; Yipeng Shi; Shiyi Chen

doi:10.1063/1.4990421

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Energy transfer, pressure tensor, and heating of kinetic plasma

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Energy transfer, pressure tensor, and heating of kinetic plasma

Yan Yang, William H. Matthaeus, Tulasi N. Parashar, Colby C. Haggerty, Vadim Roytershteyn, William Daughton, Minping Wan, Yipeng Shi and Shiyi Chen

Physics of plasmas, Vol.24(7), 072306

07/01/2017

DOI: 10.1063/1.4990421

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Abstract

Kinetic plasma turbulence cascade spans multiple scales ranging from macroscopic fluid flow to sub-electron scales. Mechanisms that dissipate large scale energy, terminate the inertial range cascade, and convert kinetic energy into heat are hotly debated. Here, we revisit these puzzles using fully kinetic simulation. By performing scale-dependent spatial filtering on the Vlasov equation, we extract information at prescribed scales and introduce several energy transfer functions. This approach allows highly inhomogeneous energy cascade to be quantified as it proceeds down to kinetic scales. The pressure work, -(P·∇)·u, can trigger a channel of the energy conversion between fluid flow and random motions, which contains a collision-free generalization of the viscous dissipation in collisional fluid. Both the energy transfer and the pressure work are strongly correlated with velocity gradients.

Details

Title: Subtitle: Energy transfer, pressure tensor, and heating of kinetic plasma
Creators: Yan Yang - Peking University
William H. Matthaeus - University of Delaware
Tulasi N. Parashar - University of Delaware
Colby C. Haggerty - University of Delaware
Vadim Roytershteyn - Space Science Institute
William Daughton - Los Alamos National Laboratory
Minping Wan - Southern University of Science and Technology
Yipeng Shi - Peking University
Shiyi Chen - Peking University
Resource Type: Journal article
Publication Details: Physics of plasmas, Vol.24(7), 072306
DOI: 10.1063/1.4990421
ISSN: 1070-664X
eISSN: 1089-7674
Grant note: University of Delaware NNX14AC39G / MMS Theory and Modeling team National Natural Science Foundation of China (http://data.elsevier.com/vocabulary/SciValFunders/501100001809) China Scholarship Council 11672123 / National Natural Science Foundation of China China Scholarship Council (http://data.elsevier.com/vocabulary/SciValFunders/501100004543) NNX14AI63G / National Aeronautics and Space Administration National Aeronautics and Space Administration (http://data.elsevier.com/vocabulary/SciValFunders/100000104) 11672123 / National Natural Science Foundation of China (http://data.elsevier.com/vocabulary/SciValFunders/501100001809) D99031L / Parker Solar Probe science team
Language: English
Date published: 07/01/2017
Academic Unit: Physics and Astronomy
Record Identifier: 9985224319002771

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