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A.I.K.E.F.: Adaptive hybrid model for space plasma simulations

Müller, Joachim and Simon, Sven and Motschmann, Uwe and Schüle, Josef and Glassmeier, Karl-Heinz and Pringle, Gavin J. (2011) A.I.K.E.F.: Adaptive hybrid model for space plasma simulations. Computer Physics Communications, 182 (4), pp. 946-966. Elsevier. doi: 10.1016/j.cpc.2010.12.033. ISSN 0010-4655.

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The interaction between magnetized space plasmas and obstacles like comets, asteroids or planets is determined by a variety of physical processes that occur simultaneously on significantly different length and time scales. Frequently the dynamics of individual ions play a key role for the shape of the interaction region: strong velocity shear between light and heavy plasma constituents, non-Maxwellian particle distributions due to pick up and asymmetries in the magnetic field topology are crucial in determining this type of interaction. Covering these processes is beyond the scope of any Magnetohydrodynamic (MHD) model. In order to account for these effects we have developed a new adaptive hybrid code A.I.K.E.F. (Adaptive Ion-Kinetic Electron-Fluid). The code operates on Cartesian meshes that can adapt to the physical structures in both, space and time. To the authors’ knowledge, there is no other adaptive hybrid simulation code in space plasma physics to the present day. Adaptivity is implemented by means of Hybrid-Block-AMR, that is individual octs are refined rather than entire blocks, where an oct is one eighth of a block. In order to account for a reasonable number of particles in each cell, particles are refined via splitting and merging. Both procedures conserve mass, momentum and kinetic energy. The code is implemented in C++ and efficiently parallelized for distributed systems by means of the Message Passing Interface (MPI). In order to demonstrate the validity of our newly developed code we have applied it to a series of fundamental test scenarios. On the one hand we demonstrate that the dispersion relation as well as the propagation characteristics of MHD and whistler mode waves are quantitatively reproduced by our simulation code. Wave propagation remains unaffected when traveling through regions that include different refinement levels. On the other hand we verify that the results obtained on high resolution uniform meshes are identical to the results from adaptive simulations that use coarse base meshes but include various levels of refinement. A remarkable speedup could be observed: the adaptive simulations required 71 times less CPU-hours than the uniform mesh simulations. Finally, we present a first series of global, three-dimensional simulations for the interaction of Mercury with the solar wind and a real time study of Titan’s plasma interaction during a magnetosheath excursion.

Item URL in elib:https://elib.dlr.de/70122/
Document Type:Article
Title:A.I.K.E.F.: Adaptive hybrid model for space plasma simulations
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Müller, JoachimInstitute for Theoretical Physics, TU Braunschweig, GermanyUNSPECIFIED
Simon, SvenInstitute of Geophysics and Meteorology, University of Cologne, GermanyUNSPECIFIED
Motschmann, UweInstitute for Theoretical Physics, TU Braunschweig, Germany; uwe.motschmann (at) dlr.deUNSPECIFIED
Schüle, JosefGauss-IT-Centre, TU Braunschweig, GermanyUNSPECIFIED
Glassmeier, Karl-HeinzInstitute for Geophysics and Extraterrestrial Physics, TU Braunschweig, Germany, Max-Planck-Institute for Solar System Research, Katlenburg-Lindau, GermanyUNSPECIFIED
Pringle, Gavin J.EPCC, University of Edinburgh, UKUNSPECIFIED
Journal or Publication Title:Computer Physics Communications
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.cpc.2010.12.033
Page Range:pp. 946-966
Keywords:Adaptive mesh refinement Particle-in-cell codes, Hybrid simulation codes, Parallel computing, Space plasma physics
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Planetenforschung (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Brumm, Laura-Maria
Deposited On:21 Jun 2011 08:10
Last Modified:06 Sep 2019 15:17

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