Outflow Behavior from the Transonic Advective Disks: A Hydrodynamical Simulation Study
arXiv:2607.26884
The study uses hydrodynamical simulations to examine how viscosity and radiative cooling affect outflows from hot and cold transonic advective accretion disks, finding that higher viscosity boosts outflow rates, energy, and momentum fluxes.
Abstract
We investigate the properties of outflows from the transonic advective accretion disk using hydrodynamical numerical simulations. We consider two different disk temperatures with an order-of-magnitude difference. For the hotter disk, we adopt initial conditions for velocity, specific angular momentum, and temperature from analytical solutions. In the colder disk case, the velocity and angular momentum profiles are kept identical, while an order of magnitude reduction in the temperature. The simulations are performed in the presence of viscosity and radiative cooling, considering bremsstrahlung and synchrotron processes. In both disk models, the outflow rate increases with viscosity. We also examine the poloidal velocity structures for both cases. We analyze the influence of viscosity on the mass flux-weighted energy and momentum fluxes of the outflows. Our results show that both energy and momentum fluxes increase with higher viscosity and may play a significant role in accretion feedback mechanisms.
12 pages, 4 figures, Proceedings of BINA conference held on November 2025