Connecting Collisionless Landau Fluid Closures to Collisional Plasma Physics Models

Joseph, I.; Dimits, A. M.

doi:10.1002/ctpp.201610043

Connecting Collisionless Landau Fluid Closures to Collisional Plasma Physics Models

Journal Article · Tue Jul 12 00:00:00 EDT 2016 · Contributions to Plasma Physics

DOI:https://doi.org/10.1002/ctpp.201610043· OSTI ID:1466946

Joseph, I. ^[1]; Dimits, A. M. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

In this work, collisionless Landau fluid models are combined with collisional fluid models using a Padé approximation that is accurate in both collisionality limits. The collisionless models capture Landau damping through a nonlocal integro-differential sub-diffusion operator with ballistic characteristics. Collisional extensions of Landau fluid models are derived by analyzing the higher order moment equations which combine a Landau closure with collisional friction forces. The model derived here evolves fluid moments for density, parallel velocity, and anisotropic pressure and includes the frictional heat flux, the parallel thermal force and anisotropic electrical conductivity. Since anisotropies must vanish in the collisional limit, a simple closure can be derived if the friction force neglects pitch-angle scattering for the closure moments themselves. The resulting plasma physics model is potentially quite useful for applications in magnetic fusion and astrophysics.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

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

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1466946

Report Number(s):: LLNL-JRNL--676833; 800091

Journal Information:: Contributions to Plasma Physics, Journal Name: Contributions to Plasma Physics Journal Issue: 6-8 Vol. 56; ISSN 0863-1042

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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