Abstract Details
Abstracts
Author: Joseph R Jepson
Requested Type: Poster
Submitted: 2019-02-22 18:30:27
Co-authors: C.C.Hegna,E.D.Held
Contact Info:
University of Wisconsin - Madison
Department of Engineering Phys
Madison, WI 53711
United States
Abstract Text:
Numerical calculations of poloidal flow damping in a tokamak, using a standard delta-F kinetic implementation in the extended MHD code NIMROD, are compared to analytical results for the steady-state poloidal flow. Numerically, initial value calculations are performed for an axisymmetric-shaped tokamak with an imposed kinetic distortion that initially provides a mean poloidal flow fluid velocity. Often only a 2x2 matrix inversion is used to obtain the analytical prediction for the steady-state poloidal flow [1], but it is seen that a 3x3 matrix inversion is necessary to obtain close agreement with the numerical results. The computational results are also compared with analytic predictions of time-dependent closures for the parallel viscous force and for the poloidal flow damping [2]. [1] S.P. Hirshman and D.J. Sigmar 1981 Nucl. Fusion 21 1079 [2] A. L. Garcia-Perciante et al, Phys. Plasmas 12, 052516 (2005).
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