A general relativistic hydrodynamic simulation code for studying advective, sub-Keplerian accretion flow onto black holes

TL;DR

This paper introduces a general relativistic hydrodynamics simulation code designed to model advective, sub-Keplerian accretion flows onto black holes, capturing shock structures and validating against known results.

Contribution

The paper presents a novel simulation code specifically for sub-Keplerian accretion flows near black holes, incorporating shock capturing and validation techniques.

Findings

Successfully captures shock structures in accretion flows

Validated against analytical and numerical results

Provides a tool for studying black hole accretion dynamics

Abstract

In this paper, we describe a general relativistic hydrodynamics simulation code which is developed to simulate advective accretion flow onto black holes. We are particularly interested in the accretion simulations of sub-Keplerian matter in the close vicinity of black holes. Due to the presence of centrifugal barrier, a nearly free-falling sub-Keplerian accretion flow slows down close to a black hole and can even pass through shocks before accelerating again to the black hole. We design our simulation code using the high resolution shock capturing scheme so that such shock structures can be captured and analyzed for relevance. In this paper, we describe our implementation and validation of the code against a few known analytical and numerical results of sub-Keplerian matter accretion.