All Physics Faculty Publications

Document Type

Article

Journal/Book Title/Conference

Physics of Plasmas

Author ORCID Identifier

Joseph R. Jepson: https://orcid.org/0000-0002-9992-4056

Chris C. Hegna: https://orcid.org/0000-0002-5446-1190

Volume

28

Issue

8

Publisher

A I P Publishing LLC

Publication Date

8-3-2021

First Page

1

Last Page

13

Abstract

In this work, continuum kinetic formulations are employed as a mechanism to include closure physics in an extended magnetohydrodynamics model. Two continuum kinetic approaches have been implemented in the plasma fluid code NIMROD [Sovinec et al., “Nonlinear magnetohydrodynamics with high-order finite elements,” J. Comput. Phys. 195, 355 (2004)] including a Chapman–Enskog-like (CEL) formulation and a more conventional δf approach. Ion kinetic closure schemes are employed to describe the neoclassical flow properties in axisymmetric toroidal geometry. In particular, predictions for steady-state values of poloidal flow profiles in tokamak geometry are provided using both the δf formulation and two different solution techniques for the CEL approach. These results are benchmarked against analytic theory predictions as well as results from the drift kinetic code DK4D. The continuum kinetic formulations employed here show agreement with both the analytic theory and DK4D results, and offer a novel velocity space representation involving higher-order finite elements in pitch angle.

Comments

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in J. R. Jepson, C. C. Hegna, E. D. Held, J. A. Spencer, and B. C. Lyons , "Benchmarking NIMROD continuum kinetic formulations through the steady-state poloidal flow", Physics of Plasmas 28, 082503 (2021) https://doi.org/10.1063/5.0054978 and may be found at https://aip.scitation.org/doi/abs/10.1063/5.0054978.

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