Everything about Gadget totally explained
GADGET is a freely available code for cosmological
N-body/SPH simulations written by Volker Springel at the
Max Planck Institute for Astrophysics. This article describes version 2 of GADGET (known as GADGET-2).
Description
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, both 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 which is, in principle, unlimited.
GADGET can therefore be used to address a wide array of astrophysically 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.
History
The first public version (GADGET-1, released in March 2000), was created as part of Volker's PhD project under the supervision of
Simon White. Later, the code was continuously improved during postdocs of Volker Springel at the
Harvard-Smithsonian Center for Astrophysics and the Max Planck Institute, in collaboration with Simon White and
Lars Hernquist.
The second public version (GADGET-2, released in May 2005), contains most of these improvements, except for the numerous physics modules developed for the code that go beyond gravity and ordinary gas-dynamics. The most important changes lie in a new time integration model, a new tree-code module, a new communication scheme for gravitational and SPH forces, a new
domain decomposition strategy, a novel SPH formulation based on
entropy as indepedent variable, and finally, in the addition of the TreePM functionality.
Further Information
Get more info on 'Gadget'.
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