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# GADGET <a name="gadget"></a>
GADGET is a freely available code for cosmological N-body/SPH simulations on massively parallel computers with distributed memory written by Volker Springel, Max-Plank-Institute for Astrophysics, Garching, Germany. GADGET is written in C and uses an explicit communication model that is implemented with the standardized MPI communication interface. The code can be run on essentially all supercomputer systems presently in use, including clusters of workstations or individual PCs. GADGET computes gravitational forces with a hierarchical tree algorithm (optionally in combination with a particle-mesh scheme for long-range gravitational forces) and represents fluids by means of smoothed particle hydrodynamics (SPH). The code can be used for studies of isolated systems, or for simulations that include the cosmological expansion of space, either with, or without, periodic boundary conditions. In all these types of simulations, GADGET follows the evolution of a self-gravitating collisionless N-body system, and allows gas dynamics to be optionally included. Both the force computation and the time stepping of GADGET are fully adaptive, with a dynamic range that is, in principle, unlimited. GADGET can therefore be used to address a wide array of astrophysics interesting problems, ranging from colliding and merging galaxies, to the formation of large-scale structure in the Universe. With the inclusion of additional physical processes such as radiative cooling and heating, GADGET can also be used to study the dynamics of the gaseous intergalactic medium, or to address star formation and its regulation by feedback processes.
GADGET-4 (GAlaxies with Dark matter and Gas intEracT), an evolved and improved version of GADGET-3, is a freely available code for cosmological N-body/SPH simulations on massively parallel computers with distributed memory written mainly by Volker Springel, Max-Plank-Institute for Astrophysics, Garching, Germany, nd benefiting from numerous contributions, including Ruediger Pakmor, Oliver Zier, and Martin Reinecke. GADGET-4 supports collisionless simulations and smoothed particle hydrodynamics on massively parallel computers. All communication between concurrent execution processes is done either explicitly by means of the message passing interface (MPI), or implicitly through shared-memory accesses on processes on multi-core nodes. The code is mostly written in ISO C++ (assuming the C++11 standard), and should run on all parallel platforms that support at least MPI-3. So far, the compatibility of the code with current Linux/UNIX-based platforms has been confirmed on a large number of systems.
- Web site: http://www.mpa-garching.mpg.de/gadget/
- Code download: https://repository.prace-ri.eu/ueabs/GADGET/gadget3_Source.tar.gz
- Disclaimer: please note that by downloading the code from this website, you agree to be bound by the terms of the GPL license.
- Build instructions: https://repository.prace-ri.eu/git/UEABS/ueabs/blob/r1.3/gadget/gadget3_Build_README.txt
- Test Case A: https://repository.prace-ri.eu/ueabs/GADGET/gadget3_TestCaseA.tar.gz
- Run instructions: https://repository.prace-ri.eu/git/UEABS/ueabs/blob/r1.3/gadget/gadget3_Run_README.txt
The code can be used for plain Newtonian dynamics, or for cosmological integrations in arbitrary cosmologies, both with or without periodic boundary conditions. Stretched periodic boxes, and special cases such as simulations with two periodic dimensions and one non-periodic dimension are supported as well. The modeling of hydrodynamics is optional. The code is adaptive both in space and in time, and its Lagrangian character makes it particularly suitable for simulations of cosmic structure formation. Several post-processing options such as group- and substructure finding, or power spectrum estimation are built in and can be carried out on the fly or applied to existing snapshots. Through a built-in cosmological initial conditions generator, it is also particularly easy to carry out cosmological simulations. In addition, merger trees can be determined directly by the code.
- Web site: https://wwwmpa.mpa-garching.mpg.de/gadget4
- Code download: https://gitlab.mpcdf.mpg.de/vrs/gadget4
- Build and run instructions: https://wwwmpa.mpa-garching.mpg.de/gadget4/02_running.html
- Code used in the benchmarks: https://repository.prace-ri.eu/git/UEABS/ueabs/gadget/4.0/gadget4.tar.gz
- Build instructions: https://repository.prace-ri.eu/git/UEABS/ueabs/gadget/4.0/gadget4_Build_README.txt
- Run instructions: https://repository.prace-ri.eu/git/UEABS/ueabs/gadget/4.0/gadget4_Run_README.txt
- Benchmarks:
- [Case A: Colliding galaxies with star formation](gadget/4.0/benchmark/caseA)
- [Case B: Cosmological DM-only simulation with IC creation](gadget/4.0/benchmark/caseB)
- [Case C: Adiabatic collapse of a gas sphere](gadget/4.0/benchmark/caseC)
# GPAW <a name="gpaw"></a>
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