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GR1D

swMATH ID: 6190
Software Authors: Ott, C.D.; O'Connor, E.
Description: A new open-source code for spherically symmetric stellar collapse to neutron stars and black holes. We present the new open-source spherically symmetric general-relativistic (GR) hydrodynamics code GR1D. It is based on the Eulerian formulation of GR hydrodynamics (GRHD) put forth by Romero-Ibáñez-Gourgoulhon and employs radial-gauge, polar-slicing coordinates in which the 3+1 equations simplify substantially. We discretize the GRHD equations with a finite-volume scheme, employing piecewise-parabolic reconstruction and an approximate Riemann solver. GR1D is intended for the simulation of stellar collapse to neutron stars and black holes and will also serve as a testbed for modeling technology to be incorporated in multi-D GR codes. Its GRHD part is coupled to various finite-temperature microphysical equations of state in tabulated form that we make available with GR1D. An approximate deleptonization scheme for the collapse phase and a neutrino-leakage/heating scheme for the postbounce epoch are included and described. We also derive the equations for effective rotation in 1D and implement them in GR1D. We present an array of standard test calculations and also show how simple analytic equations of state in combination with presupernova models from stellar evolutionary calculations can be used to study qualitative aspects of black hole formation in failing rotating core-collapse supernovae. In addition, we present a simulation with microphysical equations of state and neutrino leakage/heating of a failing core-collapse supernova and black hole formation in a presupernova model of a 40M ⊙ zero-age main-sequence star. We find good agreement on the time of black hole formation (within 20
Homepage: http://stellarcollapse.org/codes.html
Keywords: stellar collapse; numerical methods; black hole formation; GR1D code; protoneutron star; spinning black holes
Related Software: Einstein Toolkit; ZelmaniLeak; Spritz; ECHO; BRENT; WhiskyMHD; LORENE; SimFactory; Whisky; Carpet; GSL; Cactus; Kranc
Referenced in: 6 Publications

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