GenASiS: General Astrophysical Simulation System. I. Refinable Mesh and Nonrelativistic Hydrodynamics
This work addresses the need for efficient simulation tools for core-collapse supernovae on supercomputers, but it is incremental as it builds on existing hydrodynamics methods.
The paper introduces GenASiS, a new simulation system for astrophysics, focusing on a refinable mesh and nonrelativistic hydrodynamics methods, and benchmarks it against standard test problems to show basic competence and scalability.
GenASiS (General Astrophysical Simulation System) is a new code being developed initially and primarily, though by no means exclusively, for the simulation of core-collapse supernovae on the world's leading capability supercomputers. This paper---the first in a series---demonstrates a centrally refined coordinate patch suitable for gravitational collapse and documents methods for compressible nonrelativistic hydrodynamics. We benchmark the hydrodynamics capabilities of GenASiS against many standard test problems; the results illustrate the basic competence of our implementation, demonstrate the strengths and limitations of the HLLC relative to the HLL Riemann solver in a number of interesting cases, and provide preliminary indications of the code's ability to scale and to function with cell-by-cell fixed-mesh refinement.