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norgaard_epr_2014.pdf2014-08-15 16:56:07Peter Norgaard

NIMROD Solver for Plasma-Neutral Fluid Modeling

Author: Peter C. Norgaard
Requested Type: Poster Only
Submitted: 2014-05-30 01:42:50

Co-authors: E.T. Meier, U. Shumlak

Contact Info:
University of Washington
120 AERB
Seattle, WA   98195-2
USA

Abstract Text:
NIMROD is being modified to solve reacting plasma-neutral fluid dynamics for 3D fusion configurations. Our objective is validation of this model applied to significant processes such as transport and boundary physics that are relevant in both compact and reactor-scale experiments. Consideration of the relatively short mean free path of neutrals colliding with the plasma makes a neutral fluid treatment an acceptable approximation of the kinetic physics. Computational constraints further motivate the implementation of a fluid plasma-neutral model for simulations of experimental configurations. To that end, a generalized fluid model was derived from the Boltzmann equation that captures the effects of plasma interacting with a gasdynamic neutral fluid.[E.T. Meier and U. Shumlak, POP 2012] This model was implemented in the two-dimensional version of the HiFi code and used to study the ELF thruster and coaxial acceleration in the ZaP experiment. Our present effort is to incorporate the model into the NIMROD pseudospectral / finite element code, which has been used extensively for simulating MHD physics. A previous extension to NIMROD was developed for modeling injection of impurity gas to quench a tokamak,[V.A. Izzo et al., POP 2009] however it was limited to coupling through the continuity equation. The goal of this work is an implementation that evolves neutral density, velocity, and temperature, fully coupled to the Hall MHD equations by though appropriate collision operator expressions. The algorithm development and NIMROD implementation will be described, including existing results for neutral density and ongoing work on neutral velocity. Ultimately we hope that this implementation will then be applied to a diverse range of simulations including plasma-wall interaction, energy balance due to charge exchange transport, startup of pulsed configurations, tokamak pedestal formation, or gas injection for refueling or disruption mitigation.

Characterization: 4.0

Comments:

Workshop on Exploratory Topics in Plasma and Fusion Research (EPR) and US-Japan Compact Torus (CT) Workshop
August 5-8, 2014
Madison, Wisconsin

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