Enabling technology for global 3D<b>+</b>3V hybrid-Vlasov simulations of near-Earth space
Urs Ganse, T. Koskela, Markus Battarbee, Yann Pfau‐Kempf, Konstantinos Papadakis, Markku Alho, Maarja Bussov, Giulia Cozzani, Maxime Dubart, Harriet George, E. I. Gordeev, Maxime Grandin, Konstantinos Horaites, Jonas Suni, Vertti Tarvus, Fasil Tesema Kebede, Lucile Turc, Hongyang Zhou, Minna Palmroth
Abstract
We present methods and algorithms that allow the Vlasiator code to run global, three-dimensional hybrid-Vlasov simulations of Earth's entire magnetosphere. The key ingredients that make Vlasov simulations at magnetospheric scales possible are the sparse velocity space implementation and spatial adaptive mesh refinement. We outline the algorithmic improvement of the semi-Lagrangian solver for six-dimensional phase space quantities, discuss the coupling of Vlasov and Maxwell equations' solvers in a refined mesh, and provide performance figures from simulation test runs that demonstrate the scalability of this simulation system to full magnetospheric runs.