Abstract Details
Abstracts
Author: Andrew Spencer
Requested Type: Poster
Submitted: 2023-03-31 14:10:39
Co-authors: E.D. Held, J.R. Jepson
Contact Info:
Utah State University
4415 Old Main Hill
Logan, UT 84322-4415
United States
Abstract Text:
The Chapman-Enskog-like (CEL) method [1] is a mechanism to provide self-consistent kinetic closures for plasma fluid models, extending their scope of validity to the long mean free path regime. The continuum kinetic CEL formulations used in NIMROD couple the ion and electron drift kinetic equations to extended MHD providing closures for collisional friction and energy exchange and parallel heat flows and stresses. In order to handle the tight, nonlinear fluid/kinetic coupling, a Newton-Krylov method is used to advance temperatures and kinetic distortion simultaneously over time steps large relative to thermal transport processes. To test if this approach is an improvement over other CEL formulations in NIMROD, we examine the nonlinear damping of sound waves and modifications to tearing mode stability. This research is supported by the U.S. Department of Energy grant no. DE-SC0018146.
[1] J. J. Ramos, Phys Plasmas 17, 082502 (2010); J. J. Ramos, Phys Plasmas 18, 102506 (2011).
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