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Yoon, Eisung
Fusion and Plasma Application Research Lab.
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A fully non-linear multi-species Fokker-Planck-Landau collision operator for simulation of fusion plasma

Author(s)
Hager, RobertYoon, EisungKu, S.D'Azevedo, E. F.Worley, P. H.Chang, C. S.
Issued Date
2016-06
DOI
10.1016/j.jcp.2016.03.064
URI
https://scholarworks.unist.ac.kr/handle/201301/23988
Fulltext
https://www.sciencedirect.com/science/article/pii/S0021999116300298?via%3Dihub
Citation
JOURNAL OF COMPUTATIONAL PHYSICS, v.315, pp.644 - 660
Abstract
Fusion edge plasmas can be far from thermal equilibrium and require the use of a non-linear collision operator for accurate numerical simulations. In this article, the non-linear single-species Fokker-Planck-Landau collision operator developed by Yoon and Chang (2014) [9] is generalized to include multiple particle species. The finite volume discretization used in this work naturally yields exact conservation of mass, momentum, and energy. The implementation of this new non-linear Fokker-Planck-Landau operator in the gyrokinetic particle-in-cell codes XGC1 and XGCa is described and results of a verification study are discussed. Finally, the numerical techniques that make our non-linear collision operator viable on high-performance computing systems are described, including specialized load balancing algorithms and nested OpenMP parallelization. The collision operator's good weak and strong scaling behavior are shown.
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
ISSN
0021-9991
Keyword (Author)
PlasmaFusionCollision operatorXGCParticle-in-cell
Keyword
TRANSPORTEQUATION

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