Effects of mesh topology on MHD solution features in coronal simulations

Magnetohydrodynamic (MHD) simulations of the solar corona have become more popular with increased availability computational power. Modern plasma codes, relying upon Computational Fluid Dynamics (CFD) methods, allow for resolving coronal features using surface magnetograms as inputs. These computations are carried out in a full 3D domain and thus selection right mesh configuration is essential to save resources enable/speed up convergence. In addition, it has been observed that MHD close hydrostatic equilibrium, spurious numerical artefacts might appear solution following structure, which makes grid also concern accuracy. The purpose this paper discuss trade off two main topologies when applied global unstructured ideal solver from COOLFluiD platform. first topology based on geodesic polyhedron second UV mapping. Focus will be placed aspects such adaptability, resolution distribution, resulting fluxes convergence performance. For purpose, firstly rotating dipole case investigated, followed by real minima (1995) maxima (1999). It concluded most appropriate simulation depends several factors, accuracy requirements, presence near polar regions and/or strong flow field general. If contains dynamics, then grids recommended compared conventionally used UV-mapped meshes.