APPLICATION OF THE CUBED-SPHERE GRID TO TILTED BLACK HOLE ACCRETION DISKS

摘要: In recent work we presented the first results of global general relativistic magnetohydrodynamic (GRMHD) simulations tilted (or misaligned) accretion disks around rotating black holes. The simulated showed dramatic differences from comparable untilted disks, such as asymmetrical onto hole through opposing "plunging streams" and precession disk powered by a torque provided hole. However, those used traditional spherical-polar grid that was purposefully under-resolved along pole, which prevented us assessing behavior any jets may have been associated with disks. To address this shortcoming added block-structured "cubed-sphere" option to Cosmos++ GRMHD code, will allow simultaneously resolve polar regions. Here present our implementation small suite validation tests intended demonstrate new performs expected. most important test in is comparison identical one evolved using other cubed-sphere grid. We also an interesting dependence early-time evolution on their orientation respect alignment. This arises differing treatment current sheets within especially whether or not they are aligned symmetry planes