SMuK 2021 – wissenschaftliches Programm
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GR: Fachverband Gravitation und Relativitätstheorie
GR 6: Numerical relativity
GR 6.5: Vortrag
Mittwoch, 1. September 2021, 17:30–17:45, H6
GR-Athena++: puncture evolutions on vertex-centered oct-tree AMR — •Francesco Zappa — Friedrich Schiller Universität, Jena, Germany
Numerical relativity is key to explore the strong-field gravity regime of black hole and compact binary systems. Multi-messenger astronomy requires accurate numerical relativity simulations in order to construct and develop precise gravitational-wave models and to study the outcome of black hole and neutron star mergers in regions of the parameter space which have not been explored yet. Such simulations can be very costly and thus highly performant and scalable codes, capable of efficiently using the modern massively-parallel architectures available nowadays, are needed.
We present GR-Athena++, an extension of the astrophysical code Athena++ which solves the Z4c equations to evolve the dynamical spacetime employing an oct-tree based adaptive mesh refinement strategy. We test our code comparing results from simulations of binary black hole mergers against other numerical relativity codes and performing comparisons against state-of-the-art effective-one-body waveforms. GR-Athena++ exhibits excellent scalability properties, inherited from Athena++ task-based parallelism strategy. Our tests show strong scaling efficiencies above 90% for up to ∼ 104 CPUs and almost perfect weak scaling up to ∼ 105 CPUs.
These results demonstrate that GR-Athena++ can perform accurate binary black hole evolution efficiently on a large number of CPUs, providing a viable option for exascale numerical relativity.