Abstract Details
Abstracts
Author: Hankyu Q. Lee
Requested Type: Poster
Submitted: 2019-02-20 12:26:42
Co-authors: J.A.Spencer, E.D.Held, J.-Y.Ji
Contact Info:
Utah State Univ
4415 OLD MAIN HILL
LOGAN, Utah 84322
United States
Abstract Text:
The general parallel moment equations are implemented in NIMROD to compute parallel closures. The closures are obtained in various collisionality by solving truncated sets of moment equations. The implemented code is verified by reproducing analytic (integral) parallel closures in stationary and linear conditions for various collisionality [1,2]. For time-dependent nonlinear problems, the semi-implicit time discretization and general minimal residual (GMRES) algorithm are applied to implement non-linear coupling terms between parallel variations of a magnetic field and general moments. Thereby the neoclassical transport is computed in a variety of tokamak equilibria. Calculated results for the flux surface averaged bootstrap current are compared with the continuum kinetic ones in NIMROD [3].
[1] J.-Y. Ji, S.-K. Kim, E. D. Held, and Y.-S. Na, Phys. Plasmas 23, 032124 (2016).
[2] J.-Y. Ji, H. Q. Lee, and E. D. Held, Phys. Plasmas 24, 022127 (2017).
[3] E. D. Held, S. E. Kruger, J. -Y. Ji, E. A. Belli, and B. C. Lyons, Phys. Plasmas 22, 032511 (2015).
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