GenASiS: General Astrophysical Simulation System. I. Refinable Mesh and Nonrelativistic Hydrodynamics

TL;DR

GenASiS is a new astrophysical simulation code designed for supernova modeling, featuring refined meshes and nonrelativistic hydrodynamics, with demonstrated accuracy, scalability, and solver performance insights.

Contribution

This paper introduces a refined mesh framework and hydrodynamics methods for GenASiS, showcasing its capabilities and benchmarking its performance on standard tests.

Findings

Successfully benchmarks hydrodynamics against standard tests.

Demonstrates the performance differences between HLLC and HLL solvers.

Provides preliminary evidence of scalable fixed-mesh refinement.

Abstract

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.