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General relativistic hydrodynamics on overlapping curvilinear grids


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Article

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Authors

Blakely, PM 
Nikiforakis, Nikolaos  ORCID logo  https://orcid.org/0000-0002-6694-2362
Henshaw, WD 

Abstract

Aims. We investigate the use of some high-resolution shock-capturing schemes on curvilinear grids in the context of general relativistic hydrodynamics (GRHD). We aim to demonstrate that these can be used to evolve accurately fluid flow onto a black hole. Methods. We describe a numerical scheme which applies high-resolution shock-capturing schemes and the curvilinear overlapping grids methodology to the evolution of the equations of GRHD. Results. We apply our scheme to the problem of Bondi-Hoyle-Lyttleton accretion onto a black hole.We validate our approach against an exact solution of the problem and against previous numerical results. Our approach allows for the incident wind to be at any angle to the spin-axis of the Kerr black hole, and also allows the flow density to be perturbed upstream. We give an illustration of the effects of these perturbations on the resulting flow-field.

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Keywords

methods: numerical, accretion, accretion disks, hydrodynamics, shock waves

Journal Title

Astronomy and Astrophysics

Conference Name

Journal ISSN

0004-6361
1432-0746

Volume Title

575

Publisher

EDP Sciences
Sponsorship
This work was funded by an EPSRC Doctoral Training Grant, and use was also made of the Darwin Supercomputer of the University of Cambridge High Performance Computing Service (http://www.hpc.cam. ac.uk/), provided by Dell Inc. using Strategic Research Infrastructure Funding from the Higher Education Funding Council for England.