Multi-level multi-domain algorithm implementation for two-dimensional multiscale particle in cell simulations

doi:10.1016/j.jcp.2013.12.016

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Multi-level multi-domain algorithm implementation for two-dimensional multiscale particle in cell simulations

2014-08-01

PRE

A. Beck *

Maria Elena Innocenti

Giovanni Lapenta

Stefano Markidis

DOI：10.1016/j.jcp.2013.12.016

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Abstract

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There are a number of modeling challenges posed by space weather simulations. Most of them arise from the multiscale and multiphysics aspects of the problem. The multiple scales dramatically increase the requirements, in terms of computational resources, because of the need of performing large scale simulations with the proper small-scales resolution. Lately, several suggestions have been made to overcome this difficulty by using various refinement methods which consist in splitting the domain into regions of different resolutions separated by well defined interfaces. The multiphysics issues are generally treated in a similar way: interfaces separate the regions where different equations are solved. This paper presents an innovative approach based on the coexistence of several levels of description, which differ by their resolutions or, potentially, by their physics. Instead of interacting through interfaces, these levels are entirely simulated and are interlocked over the complete extension of the overlap area. This scheme has been applied to a parallelized, two-dimensional, Implicit Moment Method Particle in Cell code in order to investigate its multiscale description capabilities. Simulations of magnetic reconnection and plasma expansion in vacuum are presented and possible implementation options for this scheme on very large systems are also discussed. (C) 2013 Elsevier Inc. All rights reserved.

Keywords:

Particle-in-cell

Multiscale

Refinement

Multi-level

Multi-domain

Implicit

Adaptive

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