  Three-dimensional numerical simulations of a hot accretion flow around a
supermassive black hole are performed using the general relativity
magneto-hydrodynamic (GRMHD) code Athena++. We focus on the case of SANE, with
the initial magnetic field consisting of multiple loops with oppositely
directed poloidal magnetic field in the torus. Using the simulation data, we
investigate the formation of flux ropes, follow the forming of flux ropes atop
the disk, and their release into corona.
