|Algorithmic Breakthroughs in Multiscale Particle-in-Cell Simulations
|444, 5th International Conference of Numerical Modeling of Space Plasma Flows (ASTRONUM 2010)
|Omelchenko, Y. A.; Karimabadi, H.
|Large-scale 3D hybrid (electron fluid, kinetic ion) and full electromagnetic PIC simulations have
recently emerged as accurate computational tools for predicting energetic particle transport in
complex plasma and magnetic configurations. Multiple temporal and spatial scales associated with
both plasma and magnetic field inhomogeneities force severe restrictions on the global timestep
in these CPU-intense PIC applications. We present two multi-scale approaches intended to relieve
these issues. First, we discuss a new asynchronous hybrid code, HYPERS, which discards traditional
time stepping in favor of Discrete-Event Simulation (DES). In DES time increments for individual
particles and local electromagnetic fields are adaptively selected through limiting per-update
changes of their properties. Second, we present a novel subgridding method for full EM-PIC simulations
implemented in our EMPOWER code. Both codes are being geared towards production runs on
exascale parallel computer architectures.