SPHINCS_BSSN: a general relativistic smooth particle hydrodynamics code for dynamical spacetimes
نویسندگان
چکیده
Abstract We present a new methodology for simulating self-gravitating general-relativistic fluids. In our approach the fluid is modelled by means of Lagrangian particles in framework (GR) smoothed particle hydrodynamics (SPH) formulation, while spacetime evolved on mesh according to Baumgarte–Shapiro–Shibata–Nakamura (BSSN) formulation that also frequently used Eulerian GR-hydrodynamics. To best knowledge this first fully general relativistic code (all previous SPH approaches approximations GR-gravity). A core ingredient particle–mesh coupling between gas (represented particles) and mesh) which we have developed set sophisticated interpolation tools are inspired other approaches, particular vortex-particle methods. One advantage splitting matter it gives us more freedom choosing resolution, so that—if smooth enough—we obtain good results already with moderate number grid cells can focus computational effort simulation matter. Further advantages ease ejecta be tracked fact neutron star surface remains well-behaved does not need any treatment. part use techniques SPH, such as reconstruction, slope limiting steering dissipation monitoring entropy conservation. describe here detail employed numerical methods demonstrate performance benchmark problems ranging from shock tube tests, over Cowling dynamical evolution stars self-consistently spacetimes.
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ژورنال
عنوان ژورنال: Classical and Quantum Gravity
سال: 2021
ISSN: ['1361-6382', '0264-9381']
DOI: https://doi.org/10.1088/1361-6382/abee65