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Introduction of temporal sub-stepping in the Multi-Level Multi-Domain semi-implicit Particle-In-Cell code Parsek2D-MLMD
KTH, School of Computer Science and Communication (CSC), High Performance Computing and Visualization (HPCViz). KTH, School of Computer Science and Communication (CSC), Centres, Centre for High Performance Computing, PDC.ORCID iD: 0000-0003-0639-0639
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2015 (English)In: Computer Physics Communications, ISSN 0010-4655, E-ISSN 1879-2944, Vol. 189, 47-59 p.Article in journal (Refereed) Published
Abstract [en]

In this paper, the introduction of temporal sub-stepping in Multi-Level Multi-Domain (MLMD) simulations of plasmas is discussed. The MLMD method addresses the multi-scale nature of space plasmas by simulating a problem at different levels of resolution. A large-domain "coarse grid" is simulated with low resolution to capture large-scale, slow processes. Smaller scale, local processes are obtained through a "refined grid" which uses higher resolution. Very high jumps in the resolution used at the different levels can be achieved thanks to the Implicit Moment Method and appropriate grid interlocking operations. Up to now, the same time step was used at all the levels. Now, with temporal sub-stepping, the different levels can also benefit from the use of different temporal resolutions. This saves further resources with respect to "traditional" simulations done using the same spatial and temporal stepping on the entire domain. It also prevents the levels from working at the limits of the stability condition of the Implicit Moment Method. The temporal sub-stepping is tested with simulations of magnetic reconnection in space. It is shown that, thanks to the reduced costs of MLMD simulations with respect to single-level simulations, it becomes possible to verify with realistic mass ratios scaling laws previously verified only for reduced mass ratios. Performance considerations are also provided.

Place, publisher, year, edition, pages
2015. Vol. 189, 47-59 p.
Keyword [en]
Implicit, Adaptive, Sub-stepping, Magnetic reconnection, Electron jets, Multi-Level Multi-Domain
National Category
Computer and Information Science Physical Sciences
URN: urn:nbn:se:kth:diva-163438DOI: 10.1016/j.cpc.2014.12.004ISI: 000350087300005ScopusID: 2-s2.0-84922900602OAI: diva2:801047
EU, FP7, Seventh Framework Programme, 284461

QC 20150408

Available from: 2015-04-08 Created: 2015-04-07 Last updated: 2015-04-08Bibliographically approved

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Markidis, Stefano
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High Performance Computing and Visualization (HPCViz)Centre for High Performance Computing, PDC
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