论文标题

Maxwell有限元求解器的域分解框架和PIC的应用

Domain Decomposition Framework for Maxwell Finite Element Solvers and Application to PIC

论文作者

Crawford, Zane D., Ramachandran, O. H., O'Connor, Scott, Dault, Daniel L., Luginsland, John, Shanker, B.

论文摘要

与带电物种相互作用的田地自动模拟的最流行的方法是使用有限的差异时间域(FDTD)方法,以及牛顿运动定律,以进化颗粒的位置和速度。尽管它们很受欢迎,但FDTD粒子在细胞(EM-FDDDPIC)方法中的局限性却是众所周知的。为了解决这些问题,在过去的十年中,人们对探索替代方案产生了浓厚的兴趣。在过去的几年中,电磁有限元方法的粒子(EM-FEMPIC)的进步已通过跳跃和边界提出。现在已经充分了解了无条件稳定和收费保存的隐式FEM方法所需的数学。其中一些进步是最近的。通过基于FDTD的方案进行EM-Fempic竞争所必需的下一个瓶颈是克服计算成本。我们解决这一挑战的方法是开发两种不同的有限元撕裂和集成方法,并使用这些方法为EM-FEMPIC创建域分解方案。提供了所提出的方法的详细信息以及许多结果,这些结果证明了收费保护以及许多问题的成本改善。

The most popular methods for self-consistent simulation of fields interacting with charged species is using finite difference time domain (FDTD) methods together with Newton's laws of motion to evolve locations and velocities of particles. Despite their popularity, the limitation of FDTD particle in cell (EM-FDTDPIC) methods are well known. To address these, there has been significant interest over the past decade in exploring alternatives. In the past few years, the advances in electromagnetic finite element methods for particle in cell (EM-FEMPIC) has advanced by leaps and bounds. The mathematics necessary for implicit FEM methods that are unconditionally stable and charge conserving are now well understood. Some of these advances are more recent. The next bottleneck necessary to make EM-FEMPIC competitive with FDTD based scheme is overcoming computational cost. Our approach to resolving this challenge is develop two different finite element tearing and integration approaches, and using these to create domain decomposition schemes for EM-FEMPIC. Details of the proposed methodology are presented as well as a number of results that demonstrates charge conservation as well as amelioration of costs for a number of problems.

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