Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13d2106o&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM13D-2106
Physics
Plasma Physics
[3299] Mathematical Geophysics / General Or Miscellaneous, [7833] Space Plasma Physics / Mathematical And Numerical Techniques, [7959] Space Weather / Models, [6025] Planetary Sciences: Comets And Small Bodies / Interactions With Solar Wind Plasma And Fields
Scientific paper
Kinetic ion-driven processes are crucial for understanding the complex dynamics of the closely coupled Earth magnetosphere-ionosphere system. Largely varying time and length scales impose severe numerical constraints on global simulations with hybrid (particle ions + fluid electrons) codes. To enable larger simulations we developed a unique, uni-dimensional multiscale hybrid code, HYPERS. Instead of stepping all simulation variables uniformly in time, HYPERS tracks physically meaningful changes to individual particles and cell-based electromagnetic fields via asynchronous discrete events. HYPERS has been parallelized with the Preemptive Event Processing (PEP) technique. The parallel algorithm enables arbitrary domain decompositions and processor configurations on restarts. This is a critical prerequisite for implementing a full load balancing functionality in the future. We validate HYPERS by simulating the interaction of streaming plasmas with dipole magnetospheres and show that our approach results in superior numerical metrics (stability, accuracy and speed) compared to conventional techniques. We also discuss further extensions to the HYPERS framework that would enable seemless integration of ion fluid and kinetic schemes.
Karimabadi Homa
Omelchenko Yu. A.
Vu H. X.
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