This thesis describes in detail a two-dimensional, axisymmetric computer code for
calculating fully relativistic ideal gas hydrodynamics around a Kerr black hole. The aim is to …

We study the vertical structure of a radiation-pressure-dominated disc with a hot corona. We
include all the relevant processes like bound-free opacity and convection. We show that the …

We consider the twisted accretion disc around a Kerr black hole and derive the stationary
twist equation in the leading order on small parameters of relative thickness δ, viscosity α …

We discuss a model for the central regions of radio-quiet AGN in which the coronal accretion
is the source of energy for X-ray emission. We consider a two-layer geometry and we …

Numerical solutions of the equations of hydrodynamics, gravitation, and radiative transfer in
three spatial dimensions are used to model the formation and time evolution of the early …

We propose that a stationary spectrum of magnetohydrodynamic turbulence is generated in
solar coronal loops by the interweaving of magnetic field lines driven by the turbulent …

A self-consistent solution for a thin accretion disk with turbulent convection is presented. The
disk viscosity and the convective flux are derived from a physical model for turbulence, and …

Turbulent viscosity ADS Classic is now deprecated. It will be completely retired in October
2019. This page will automatically redirect to the new ADS interface at that point. SAO/NASA …

For a long time it was believed that thermal convection could serve as the driving
mechanism for turbulence and angular momentum transport in accretion disks. Even it is …

The effects induced by viscosity on the equations governing spherical, transsonic flows are
discussed. It is shown that viscosity changes the topology of solutions, replacing the critical …