- Start Time:
- End Time:
- Location: Zoom
- Type: Lunch Talk
GR-Athena++ is a general-relativistic, high-order, vertex-centered
solver that extends the oct-tree, adaptive mesh refinement capabilities
of the astrophysical (radiation) magnetohydrodynamics code Athena++. To
simulate dynamical spacetimes GR-Athena++ uses the Z4c evolution scheme
of numerical relativity coupled to the moving puncture gauge. Stable and
accurate binary black hole merger evolutions are demonstrated in
convergence testing, cross-code validation, and verification against
state-of-the-art effective-one-body waveforms. GR-Athena++ leverages the
task-based parallelism paradigm of Athena++ to achieve excellent
scalability. Strong scaling efficiencies above 95% for up to 1.2×1e4
CPUs and excellent weak scaling up to 1e5 CPUs in a production binary
black hole setup with adaptive mesh refinement are measured. GR-Athena++
thus allows for the robust simulation of compact binary coalescences and
and offers a viable path towards numerical relativity at exascale.
