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arXiv 2101.09247math.NAcs.CEcs.NAmath-phmath.MP
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保持结构的电磁粒子网格方法的变分框架

Variational Framework for Structure-Preserving Electromagnetic Particle-In-Cell Methods

Martin Campos Pinto, Katharina Kormann, Eric Sonnendrücker

摘要:

在这篇文章中,我们适用于一个结构保持粒子场离散化框架中的弗拉索夫-麦克斯韦方程的离散作用原理。在这个框架中,有限维电磁势和电磁场被表示为一个离散的de Rham序列,涉及到一般的有限元空间,和粒子场耦合表示由一组投影算子,与微分算子交换。与最小数量的假设,允许各种有限元和形状函数的颗粒,我们表明,由此产生的变分方案具有一般的离散泊松结构,从而导致半离散哈密顿系统。通过引入离散内积,我们得到了第二种类型的空间离散,这是动量保持,基于相同的有限元和形函数。我们说明了我们的方法,将其应用到样条有限元,和一个新的谱离散化的粒子场耦合依赖于离散傅里叶变换。

英文摘要:

In this article we apply a discrete action principle for the Vlasov--Maxwell equations in a structure-preserving particle-field discretization framework. In this framework the finite-dimensional electromagnetic potentials and fields are represented in a discrete de Rham sequence involving general finite element spaces, and the particle-field coupling is represented by a set of projection operators that commute with the differential operators. With a minimal number of assumptions which allow for a variety of finite elements and shape functions for the particles, we show that the resulting variational scheme has a general discrete Poisson structure and thus leads to a semi-discrete Hamiltonian system. By introducing discrete interior products we derive a second type of space discretization which is momentum preserving, based on the same finite elements and shape functions. We illustrate our method by applying it to spline finite elements, and to a new spectral discretization where the particle-field coupling relies on discrete Fourier transforms.

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