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- Title
Spatial filtering in a 6D hybrid-Vlasov scheme for alleviating AMR artifacts: a case study with Vlasiator, versions 5.0, 5.1, 5.2.1.
- Authors
Papadakis, Konstantinos; Yann Pfau-Kempf; Ganse, Urs; Battarbee, Markus; Alho, Markku; Grandin, Maxime; Dubart, Maxime; Turc, Lucile; Hongyang Zhou; Horaites, Konstantinos; Zaitsev, Ivan; Cozzani, Giulia; Bussov, Maarja; Gordeev, Evgeny; Tesema, Fasil; George, Harriet; Suni, Jonas; Tarvus, Vertti; Palmroth, Minna
- Abstract
Numerical simulation models that are used to investigate the near-Earth space plasma environment require sophisticated methods and algorithms together with high computational power. Vlasiator 5.0 is a hybrid-Vlasov plasma simulation code that is able to perform 6D (3D in ordinary space and 3D in velocity space) simulations using Adaptive Mesh Refinement (AMR). In this work we describe a side effect of using AMR in Vlasiator 5.0 where the heterologous grid approach creates resolution induced discontinuities due to the different grid resolution levels. The discontinuities cause spurious oscillations in the electromagnetic fields that alter the global results. We present and test a spatial filtering operator for alleviating this artifact without significantly increasing the computational overhead. We demonstrate the operator's use case in large 6D AMR simulations and evaluate its performance with different implementations.
- Subjects
SPATIAL filters; SPACE plasmas; SPACE environment; ELECTROMAGNETIC fields; COMPUTER simulation
- Publication
Geoscientific Model Development Discussions, 2022, p1
- ISSN
1991-9611
- Publication type
Article
- DOI
10.5194/egusphere-2022-420