Numerical Simulation of Viscous Shocked Accretion Flows Around Black Holes
The work developed in this thesis addresses very important and relevant issues of accretion processes around black holes. Beginning by studying the time variation of the evolution of inviscid accretion discs around black holes and their properties, the author investigates the change of the pattern of the flows when the strength of the shear viscosity is varied and cooling is introduced. He succeeds to verify theoretical predictions of the so called Two Component Advective Flow (TCAF) solution of the accretion problem onto black holes through numerical simulations under different input parameters. TCAF solutions are found to be stable. And thus explanations of spectral and timing properties (including Quasi-Period Oscillations, QPOs) of galactic and extra-galactic black holes based on shocked TCAF models appear to have a firm foundation.
Nominated for Springer Theses by S.N. Bose National Research Centre for Basic Sciences, Kolkata, India Instead of assumptions of toy models, this thesis contains step-by-step numerically simulated results to verify the existence of theoretical self-consistent generalized viscous transonic flow shock solutions Demonstrates that the latest ‘Avatar’ of the accretion/outflow picture, the Generalized Two Component Advective Flow (GTCAF), is capable of explaining almost all the black hole observational resultsAddresses the challenge of approximating the turbulent viscosity