Two particle-in-grid realisations on spacetrees

Abstract : The present paper studies two particle management strategies for dynamically adaptive Cartesian grids at hands of a particle-in-cell code. One holds the particles within the grid cells, the other within the grid vertices. The fundamental challenge for the algorithmic strategies results from the fact that particles may run through the grid without velocity constraints. To facilitate this, we rely on multiscale grid representations. They allow us to lift and drop particles between different spatial resolutions. We call this cell-based strategy particle in tree (PIT). Our second approach assigns particles to vertices describing a dual grid (PIDT) and augments the lifts and drops with multiscale linked cells. Our experiments validate the two schemes at hands of an electrostatic particle-in-cell code by retrieving the dispersion relation of Langmuir waves in a thermal plasma. They reveal that different particle and grid characteristics favour different realisations. The possibility that particles can tunnel through an arbitrary number of grid cells implies that most data is exchanged between neighbouring ranks, while very few data is transferred non-locally. This constraints the scalability as the code potentially has to realise global communication. We show that the merger of an analysed tree grammar with PIDT allows us to predict particle movements among several levels and to skip parts of this global communication a priori. It is capable to outperform several established implementations based upon trees and/or space-filling curves.
Type de document :
Article dans une revue
Parallel Computing, Elsevier, 2016, 52, pp.42-64. 〈10.1016/j.parco.2015.12.007〉
Liste complète des métadonnées

Littérature citée [26 références]  Voir  Masquer  Télécharger

https://hal-insu.archives-ouvertes.fr/insu-01259575
Contributeur : Nathalie Pothier <>
Soumis le : mercredi 20 janvier 2016 - 16:12:06
Dernière modification le : jeudi 7 février 2019 - 17:17:16
Document(s) archivé(s) le : jeudi 21 avril 2016 - 11:18:27

Fichier

1-s2.0-S0167819115001635-main....
Fichiers éditeurs autorisés sur une archive ouverte

Licence


Distributed under a Creative Commons Paternité - Pas d'utilisation commerciale - Pas de modification 4.0 International License

Identifiants

Collections

Citation

T. Weinzierl, B. Verleye, Pierre Henri, D. Roose. Two particle-in-grid realisations on spacetrees. Parallel Computing, Elsevier, 2016, 52, pp.42-64. 〈10.1016/j.parco.2015.12.007〉. 〈insu-01259575〉

Partager

Métriques

Consultations de la notice

192

Téléchargements de fichiers

43