A fully non-linear multi-species Fokker-Planck-Landau collision operator for simulation of fusion plasma

作者：Hager Robert^*; Yoon E S; Ku S; D'Azevedo E F; Worley P H; Chang C S

来源：Journal of Computational Physics, 2016, 315: 644-660.

DOI：10.1016/j.jcp.2016.03.064

• Plasma
• Fusion
• Collision operator
• XGC
• Particle-in-cell

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.

• 出版日期2016-6-15