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Simulating Cosmic Structure Formation with the Gadget-4 Code by Volker Springel; Rüdiger Pakmor; Oliver Zier; Martin Reinecke is a Physics and Astronomy article available to read on EtoBox.

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## ABSTRACT Numerical methods have become a powerful tool for research in astrophysics, but their utility depends critically on the availability of suitable simulation codes. This calls for continuous efforts in code development, which is necessitated also by the rapidly evolving technology underlying today’s computing hardware. Here, we discuss recent methodological progress in the gadget code, which has been widely applied in cosmic structure formation over the past two decades. The new version offers improvements in force accuracy, in time-stepping, in adaptivity to a large dynamic range in time-scales, in computational efficiency, and in parallel scalability through a special MPI/shared-memory parallelization and communication strategy, and a more-sophisticated domain decomposition algorithm. A manifestly momentum conserving fast multipole method (FMM) can be employed as an alternative to the one-sided TreePM gravity solver introduced in earlier versions. Two different flavours of smoothed particle hydrodynamics, a classic entropy-conserving formulation and a pressure-based approach, are supported for dealing with gaseous flows. The code is able to cope with very large problem

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Author

Volker Springel; Rüdiger Pakmor; Oliver Zier; Martin Reinecke

Publisher

Oxford University Press (OUP)

Published

2021

Language

EN

Field

Physics and Astronomy (Physical Sciences)