Fully kinetic simulations of strong steady-state collisional planar plasma shocks

Anderson, Steven Edward; Chacon, Luis; Taitano, William T.; Simakov, Andrei N.; Keenan, Brett D.

doi:10.1103/physreve.104.055205

Title: Fully kinetic simulations of strong steady-state collisional planar plasma shocks

Journal Article · Tue Nov 16 00:00:00 EST 2021 · Physical Review. E

DOI:https://doi.org/10.1103/physreve.104.055205· OSTI ID:1834533

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

We report on simulations of strong, steady-state collisional planar plasma shocks with fully kinetic ions and electrons, independently confirmed by two fully kinetic codes (an Eulerian continuum and a Lagrangian particle-in-cell). While kinetic electrons do not fundamentally change the shock structure as compared with fluid electrons, we find an appreciable rearrangement of the preheat layer, associated with nonlocal electron heat transport effects. The electron heat-flux profile qualitatively agrees between kinetic- and fluid-electron models, suggesting a certain level of “stiffness,” though substantial nonlocality is observed in the kinetic heat flux. We also find good agreement with nonlocal electron heat-flux closures proposed in the literature. Finally, in contrast to the classical hydrodynamic picture, we find a significant collapse in the “precursor” electric-field shock at the preheat layer leading edge, which correlates with the electron-temperature gradient relaxation.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1834533

Report Number(s):: LA-UR-21-25938; TRN: US2300179

Journal Information:: Physical Review. E, Vol. 104, Issue 5; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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