Journal
CLASSICAL AND QUANTUM GRAVITY
Volume 31, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0264-9381/31/1/015005
Keywords
general-relativistic MHD; Einstein toolkit
Categories
Funding
- National Science Foundation in the USA [0903973 / 0903782 / 0904015, 1212401 / 1212426 / 1212433 / 1212460]
- Einstein Toolkit [NSF AST-1028087, NSF PHY-1214449, NSF AST-1212170, CAREER NSF PHY-0969855, NSF OCI-0905046, DMS-0820923, NASA 08-ATFP08-0093]
- NSERC
- Deutsche Forschungsgemeinschaft [SFB/Transregio 7]
- Alfred P Sloan Foundation
- Natural Sciences and Engineering Council of Canada
- NASA [PF2-130099, NAS8-03060]
- Chandra X-ray center
- NSF [0941417/12058564]
- Direct For Computer & Info Scie & Enginr
- Office of Advanced Cyberinfrastructure (OAC) [0832606] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1212170] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1212426, 1212460] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1028087] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [0903973, 904015, 1212401, 1212433, 1229173] Funding Source: National Science Foundation
- Office of Advanced Cyberinfrastructure (OAC)
- Direct For Computer & Info Scie & Enginr [0905046, 0910735] Funding Source: National Science Foundation
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We present the new general-relativistic magnetohydrodynamics (GRMHD) capabilities of the Einstein toolkit, an open-source community-driven numerical relativity and computational relativistic astrophysics code. The GRMHD extension of the toolkit builds upon previous releases and implements the evolution of relativistic magnetized fluids in the ideal MHD limit in fully dynamical spacetimes using the same shock-capturing techniques previously applied to hydrodynamical evolution. In order to maintain the divergence-free character of the magnetic field, the code implements both constrained transport and hyperbolic divergence cleaning schemes. We present test results for a number of MHD tests in Minkowski and curved spacetimes. Minkowski tests include aligned and oblique planar shocks, cylindrical explosions, magnetic rotors, Alfven waves and advected loops, as well as a set of tests designed to study the response of the divergence cleaning scheme to numerically generated monopoles. We study the code's performance in curved spacetimes with spherical accretion onto a black hole on a fixed background spacetime and in fully dynamical spacetimes by evolutions of a magnetized polytropic neutron star and of the collapse of a magnetized stellar core. Our results agree well with exact solutions where these are available and we demonstrate convergence. All code and input files used to generate the results are available on http://einsteintoolkit.org. This makes our work fully reproducible and provides new users with an introduction to applications of the code.
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