A performant energy-conserving particle reweighting method for Particle-in-Cell simulations

被引:0
|
作者
Boerner, Jeremiah J. [1 ]
Hall, Taylor [1 ]
Hooper, Russell [1 ]
Bettencourt, Matthew T. [2 ]
Hopkins, Matthew M. [1 ]
Grillet, Anne M. [1 ]
Pacheco, Jose L. [1 ]
机构
[1] Sandia Natl Labs, 1515 Eubank Blvd SE, Albuquerque, NM 87123 USA
[2] NVIDIA Corp, Via Melchiorre Gioia 8, I-20124 Milan, Italy
关键词
Particle-in-Cell; Macro-particle; Reweighting; NUMBER; MANAGEMENT; DYNAMICS; FLUID; CODE;
D O I
10.1016/j.jcp.2024.113454
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
A new particle-based reweighting method is developed and demonstrated in the Aleph Particle- in-Cell with Direct Simulation Monte Carlo (PIC-DSMC) program. Novel splitting and merging algorithms ensure that modified particles maintain physically consistent positions and velocities. This method allows a single reweighting simulation to efficiently model plasma evolution over orders of magnitude variation in density, while accurately preserving energy distribution functions (EDFs). Demonstrations on electrostatic sheath and collisional rate dynamics show that reweighting simulations achieve accuracy comparable to fixed weight simulations with substantial computational time savings. This highly performant reweighting method is recommended for modeling plasma applications that require accurate resolution of EDFs or exhibit significant density variations in time or space.
引用
收藏
页数:16
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