Numerical MHD Codes for Modeling Astrophysical Flows

摘要

We describe a Godunov-type magnetohydrodynamic (MHD) code based on theMiyoshi and Kusano (2005) solver which can be used to solve variousastrophysical hydrodynamic and MHD problems. The energy equation is in the formof entropy conservation. The code has been implemented on several differentcoordinate systems: 2.5D axisymmetric cylindrical coordinates, 2D Cartesiancoordinates, 2D plane polar coordinates, and fully 3D cylindrical coordinates.Viscosity and diffusivity are implemented in the code to control the accretionrate in the disk and the rate of penetration of the disk matter through themagnetic field lines. The code has been utilized for the numericalinvestigations of a number of different astrophysical problems, severalexamples of which are shown.