A gadget

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categorie: Engleza

nota: 9.95

nivel: Facultate

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 [...]
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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 Gadget
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 independent variable, and finally, in the addition of the TreePM functionality.
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