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We introduce the public version of the cosmological magnetohydrodynamicalmoving-mesh simulation code Arepo. This version contains a finite-volumemagnetohydrodynamics algorithm on an unstructured, dynamic Voronoi tessellationcoupled to a tree-particle-mesh algorithm for the Poisson equation either on aNewtonian or cosmologically expanding spacetime. Time-integration is performedadopting local timestep constraints for each cell individually, solving thefluxes only across active interfaces, and calculating gravitational forces onlybetween active particles, using an operator-splitting approach. This allowssimulations with high dynamic range to be performed efficiently. Arepo is amassively distributed-memory parallel code, using the Message Passing Interface(MPI) communication standard and employing a dynamical work-load and memorybalancing scheme to allow optimal use of multi-node parallel computers. Theemployed parallelization algorithms of Arepo are deterministic and producebinary-identical results when re-run on the same machine and with the samenumber of MPI ranks. A simple primordial cooling and star formation model isincluded as an example of sub-resolution models commonly used in simulations ofgalaxy formation. Arepo also contains a suite of computationally inexpensivetest problems, ranging from idealized tests for automated code verification toscaled-down versions of cosmological galaxy formation simulations, and isextensively documented in order to assist adoption of the code by newscientific users.

The Arepo public code release