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Author: Joseph R Jepson
Requested Type: Poster
Submitted: 2018-02-28 21:39:35

Co-authors: C.C.Hegna, E.D.Held

Contact Info:
University of Wisconsin - Madison
1500 Engineering Dr
Madison, WI   53711
United States

Abstract Text:
Calculations of poloidal flow damping in a tokamak are undertaken using a delta-F implementation of the ion drift kinetic equation (DKE) in the extended MHD code NIMROD. Initial value calculations are performed for an axisymmetric-shaped tokamak with an imposed kinetic distortion that initially provides a mean poloidal flow fluid velocity. The computational results are compared against both analytic predictions of time dependent closures for the parallel viscous force and numerical results for the poloidal flow damping [1,2]. This delta-F closure scheme, once adequately tested, will be used as a benchmark against which to compare to a hybrid fluid/kinetic DKE approach that uses a Chapman-Enskog-like (CEL) Ansatz. In this latter method, closure of the evolving lower-order fluid moment equations for n, V, and T is provided by solutions to the ion CEL-DKE written in the macroscopic flow reference frame [3]. [1] A. L. Garcia-Perciante et al, Phys. Plasmas textbf {12}, 052516 (2005). [2] C. Morris et al, Phys. Plasmas textbf {3}, 4513-4520 (1996). [3] J. J. Ramos, Phys. Plasmas textbf {18}, 102506 (2011). *Supported by DoE grants DE-FG02-86ER53218 and DE-FG02-04ER54746