SM022-06
Integration of multi-moment fluid models into the OpenGGCM global magnetosphere model

Thursday, 10 December 2020: 07:15
Virtual
Kai Germaschewski, University of New Hampshire, Durham, NH, United States, Liang Wang, Princeton University, Princeton, United States, Chuanfei Dong, Princeton University, Princeton, NJ, United States, Ammar Hakim, Princeton University, Princeton Plasma Physics Laboratory, Princeton, NJ, United States, Joachim Raeder, University of New Hampshire, Institute for the Study of Earth, Oceans, and Space, Durham, NH, United States and Amitava Bhattacharjee, Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ, United States
Abstract:
In recent work, we have extended OpenGGCM v5.0 to support additional plasma fluid models as an alternative to conventional magnetohydrodynamics (MHD). This was achieved this by coupling OpenGGCM with the Gkeyll multi-moment fluid code. Multi-moment fluid models treat electrons and (possibly multiple) ion species on the same footing and couple them via the full Maxwell system of equations. The multi-moment fluid models are derived without approximation by taking integrals of the Vlasov-Maxwell system, with the exception of having to make a closure approximation for the heat flux, e.g. assuming scalar pressure and adiabaticity for the 5-moment model and a general pressure tensor and approximate heatflux closure in the 10-moment model.

In order to make the OpenGGCM code more self-contained and accessible, we present a new version that natively includes support for the 5- and 10-moment models. Besides ease of use, this lets us explore variations of the numerical scheme, e.g., supporting staggered electric and magnetic fields, mesh refinement and asymptotic-preserving formulations, as well as refinements of the 10-moment closure.

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