The Arepo public code release. (arXiv:1909.04667v1 [astro-ph.IM])
<a href="http://arxiv.org/find/astro-ph/1/au:+Weinberger_R/0/1/0/all/0/1">Rainer Weinberger</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Springel_V/0/1/0/all/0/1">Volker Springel</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pakmor_R/0/1/0/all/0/1">Rüdiger Pakmor</a>
We introduce the public version of the cosmological magnetohydrodynamical
moving-mesh simulation code Arepo. This version contains a finite-volume
magnetohydrodynamics algorithm on an unstructured, dynamic Voronoi tessellation
coupled to a tree-particle-mesh algorithm for the Poisson equation either on a
Newtonian or cosmologically expanding spacetime. Time-integration is performed
adopting local timestep constraints for each cell individually, solving the
fluxes only across active interfaces, and calculating gravitational forces only
between active particles, using an operator-splitting approach. This allows
simulations with high dynamic range to be performed efficiently. Arepo is a
massively distributed-memory parallel code, using the Message Passing Interface
(MPI) communication standard and employing a dynamical work-load and memory
balancing scheme to allow optimal use of multi-node parallel computers. The
employed parallelization algorithms of Arepo are deterministic and produce
binary-identical results when re-run on the same machine and with the same
number of MPI ranks. A simple primordial cooling and star formation model is
included as an example of sub-resolution models commonly used in simulations of
galaxy formation. Arepo also contains a suite of computationally inexpensive
test problems, ranging from idealized tests for automated code verification to
scaled-down versions of cosmological galaxy formation simulations, and is
extensively documented in order to assist adoption of the code by new
scientific users.
We introduce the public version of the cosmological magnetohydrodynamical
moving-mesh simulation code Arepo. This version contains a finite-volume
magnetohydrodynamics algorithm on an unstructured, dynamic Voronoi tessellation
coupled to a tree-particle-mesh algorithm for the Poisson equation either on a
Newtonian or cosmologically expanding spacetime. Time-integration is performed
adopting local timestep constraints for each cell individually, solving the
fluxes only across active interfaces, and calculating gravitational forces only
between active particles, using an operator-splitting approach. This allows
simulations with high dynamic range to be performed efficiently. Arepo is a
massively distributed-memory parallel code, using the Message Passing Interface
(MPI) communication standard and employing a dynamical work-load and memory
balancing scheme to allow optimal use of multi-node parallel computers. The
employed parallelization algorithms of Arepo are deterministic and produce
binary-identical results when re-run on the same machine and with the same
number of MPI ranks. A simple primordial cooling and star formation model is
included as an example of sub-resolution models commonly used in simulations of
galaxy formation. Arepo also contains a suite of computationally inexpensive
test problems, ranging from idealized tests for automated code verification to
scaled-down versions of cosmological galaxy formation simulations, and is
extensively documented in order to assist adoption of the code by new
scientific users.
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