Dissipation and Energy Transport in Global Accretion Disks Simulations

We present Athena++ global three-dimensional magneto-hydrodynamic simulations of accretion flows onto stellar mass black holes. We conducted calculations with several initial magnetic field configurations to investigate energy transport processes. We paid particular attention to the spatial distribution of dissipation rates to assess if and how the disk can dissipate a significant fraction of accretion power in its upper-layers away from the midplane. Finally, we discuss our findings in context of the hot corona over cold disk geometry postulated to explain observed steep power law (SPL) state spectra.