Investigating the effects of numerical algorithms on global magnetohydrodynamics (MHD) simulations of solar wind in the inner heliosphere
Revista Mexicana de Física(2024)
摘要
This paper explores the effects of numerical algorithms on global
magnetohydrodynamics (MHD) simulations of solar wind (SW) in the inner
heliosphere. To do so, we use sunRunner3D, a 3-D MHD model that employs the
boundary conditions generated by CORHEL and the PLUTO code to compute the
plasma properties of the SW with the ideal MHD approximation up to 1.1 AU in
the inner heliosphere. Mainly, we define three different combinations of
numerical algorithms based on their diffusion level. This diffusion level is
related to the way of solving the MHD equations using the finite volume
formulation, and, therefore, we set in terms of the divergence-free condition
methods, Riemann solvers, variable reconstruction schemes, limiters, and
time-steeping algorithms. According to the simulation results, we demonstrate
that sunRunner3D reproduces global features of Corotating Interaction Regions
(CIRs) observed by Earth-based spacecraft (OMNI) for a set of Carrington
rotations that cover a period that lays in the late declining phase of solar
cycle 24, independently of the numerical algorithms. Moreover, statistical
analyses between models and in-situ measurements show reasonable agreement with
the observations, and remarkably, the high diffusive method matches better with
in-situ data than low diffusive methods.
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