Simulation Software

The hallmark of the CG is the ability to generate 1 model in cluster_generator and export it to a variety of simulation codes with ease. On this page, we’ve provided a list of the various simulation software we support and some software specific tips on how to use each of them.

FLASH

The FLASH 3.0 hydrodynamics code [FrOlRi] (developed at the University of Chicago) is an all purpose simulation code which relies on adaptive mesh refinement and the piecewise-parabolic method (PPM).

The FLASH simulation setup GalaxyClusterMerger can be used with the inputs to cluster_generator to perform a single-cluster simulation or a binary merger. GalaxyClusterMerger has two modes in which it can be run in: RigidGravity, which uses rigid potentials to represent the dark matter and stars, or SelfGravity, which represents the dark matter and stars as particles. GalaxyClusterMerger also supports the inclusion of a tangled magnetic field in the simulations.

GAMER

GAMER (GPU-accelerated Adaptive MEsh Refinement code [ScTsCh]) utilizes a modified AMR approach designed to utilize the acceleration potential of GPUs. The GAMER simulation setup ClusterMerger can be used with the inputs to cluster_generator to perform a single-cluster simulation, binary merger, or a triple merger. The required, optional, and recommended Makefile options for the ClusterMerger setup are as follows:

• SIMU_OPTION += -DMODEL=HYDRO (required)

• SIMU_OPTION += -DGRAVITY (required)

• SIMU_OPTION += -DPARTICLE (required)

• SIMU_OPTION += -DNCOMP_PASSIVE_USER=n (required, n = Merger_Coll_NumHalos+Merger_Coll_UseMetals, see below )

• SIMU_OPTION += -DMHD (optional, for simulations with magnetic fields)

• SIMU_OPTION += -DEOS=EOS_GAMMA (required)

• SIMU_OPTION += -DPAR_NATT_USER=2 (required, supports the type and halo attributes)

• SIMU_OPTION += -DGPU (recommended)

• SIMU_OPTION += -DLOAD_BALANCE=HILBERT (recommended)

• SIMU_OPTION += -DOPENMP (recommended)

• SIMU_OPTION += -DSUPPORT_HDF5 (required)

Arepo

Arepo [WeSpPa] is a smooth-particle hydrodynamics simulation software developed at the Max-Planck Institute for Astrophysics. CG can be used to create HDF5-based initial conditions for one, two, or three clusters for an idealized merger simulation for the Arepo code. The way to do this is to create a Gadget-like HDF5 initial conditions file:

After generating the initial conditions file, the ICs will need to be processed through two steps before the simulation proper can be run. The first step is to add a background grid of cells to the particle distribution. This is done with the ADD_BACKGROUND_GRID Config option in Arepo. The Arepo configuration options to be enabled in Config.sh for this step include:

GIZMO

Coming soon!

Enzo

Coming soon!

RAMSES

The RAMSES code is a multipurpose AMR software developed by Romain Teyssier. Because of its support for minimally invasive patching, RAMSES supports a variety of options for non-newtonian gravity, sub-grid physics, and other adaptations. In particular, RAMSES is the only code supported by CG which is capable of performing MONDian simulations.

Due to the variety of options regarding setting up RAMSES for use with CG, interested users should read the guide below for a full breakdown of what can be done with RAMSES and CG.

RAMSES

In this guide, we show you how to run a simulation in RAMSES from CG models.

Athena++

Coming soon!

References

[FrOlRi]

Fryxell, B., Olson, K., Ricker, P., Timmes, F. X., Zingale, M., Lamb, D. Q., … & Tufo, H. (2000). FLASH: An adaptive mesh hydrodynamics code for modeling astrophysical thermonuclear flashes. The Astrophysical Journal Supplement Series, 131(1), 273.

[ScTsCh]

Schive, H. Y., Tsai, Y. C., & Chiueh, T. (2010). GAMER: a graphic processing unit accelerated adaptive-mesh-refinement code for astrophysics. The Astrophysical Journal Supplement Series, 186(2), 457.

[WeSpPa]

Weinberger, R., Springel, V., & Pakmor, R. (2020). The Arepo public code release. The Astrophysical Journal Supplement Series, 248(2), 32.