München 2019 – wissenschaftliches Programm
P 8.1: Vortrag
Dienstag, 19. März 2019, 11:00–11:15, HS 20
Adaptive Multi-Physics Simulations of Collisionless Plasmas — •Simon Lautenbach and Rainer Grauer — Ruhr University Bochum
Collisionless plasmas, mostly present in astrophysical and space environments, often require a kinetic treatment as given by the Vlasov equation. Unfortunately, the six-dimensional Vlasov equation is inherently expensive to compute and thus can only be solved on very small parts of the considered spatial domain. However, in some cases, e.g. magnetic reconnection, it is sufficient to solve the Vlasov equation in a localized domain and solve the remaining domain by appropriate fluid models. We present an adaptive hierarchical treatment of collisionless plasmas ranging from fully kinetic, over a 10-moment fluid model incorporating a simplified treatment of Landau damping, to a 5-moment fluid description. To account for separation of electron and ion physics, hybrid stages of mixed electron and ion models are also allowed. To test this multiphysics approach, the full physics-adaptive hierearchy is applied to the Geospace Environmental Modeling (GEM) challenge of magnetic reconnection.