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

IF 3.8 2区物理与天体物理 Q2 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Journal of Computational Physics Pub Date : 2024-10-11 DOI:10.1016/j.jcp.2024.113454

Jeremiah J. Boerner , Taylor Hall , Russell Hooper , Matthew T. Bettencourt , Matthew M. Hopkins , Anne M. Grillet , Jose L. Pacheco

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引用次数: 0

Abstract

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.

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用于 "单元内粒子 "模拟的高性能能量守恒粒子再加权方法

在 Aleph Particle-in-Cell with Direct Simulation Monte Carlo (PIC-DSMC) 程序中开发并演示了一种新的基于粒子的重新加权方法。新颖的分割和合并算法确保修改后的粒子保持物理上一致的位置和速度。通过这种方法，只需进行一次重新加权模拟，就能有效地模拟等离子体在密度数量级变化过程中的演变，同时准确地保留能量分布函数（EDF）。静电鞘和碰撞率动力学演示表明，重新加权模拟的精确度可与固定权重模拟相媲美，同时大大节省了计算时间。对于需要精确解析 EDF 或在时间或空间上表现出显著密度变化的等离子体应用建模，推荐使用这种高性能的重新加权方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Computational Physics 物理-计算机：跨学科应用

CiteScore

7.60

自引率

14.60%

发文量

763

审稿时长

5.8 months

期刊介绍： Journal of Computational Physics thoroughly treats the computational aspects of physical problems, presenting techniques for the numerical solution of mathematical equations arising in all areas of physics. The journal seeks to emphasize methods that cross disciplinary boundaries. The Journal of Computational Physics also publishes short notes of 4 pages or less (including figures, tables, and references but excluding title pages). Letters to the Editor commenting on articles already published in this Journal will also be considered. Neither notes nor letters should have an abstract.