GADGET

GADGET

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.

ee also

* [http://www.mpa-garching.mpg.de/gadget/ GADGET homepage]


Wikimedia Foundation. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • gadget — [ gadʒɛt ] n. m. • v. 1946; mot angl., arg. mar. (1866); p. ê. du fr. gâchette appliqué à des mécanismes, ou fr. dial. gagée « outil » ♦ Dispositif, objet amusant et nouveau, parfois dénué d utilité. ⇒ bidule, bricole, 1. truc. Gadget… …   Encyclopédie Universelle

  • Gadget — (englisch für Apparat, technische Spielerei oder auch Schnickschnack) bezeichnet ein technisches Werkzeug oder Gerät mit bisher so nicht bekannter Funktionalität und/oder besonderem Design. Es ist traditionellerweise klein und handlich und zum… …   Deutsch Wikipedia

  • gadget — GADGÉT, gadgeturi, s.n. (Englezism) Obiect mic, ingenios construit, de valoare şi utilitate neînsemnată. [pr.: ghéget] – Din engl. gadget. Trimis de gall, 13.09.2007. Sursa: DEX 98  gadgét s. n., pl. gadgéturi Trimis de siveco, 10.08.2004. Sursa …   Dicționar Român

  • gadget — UK US /ˈgædʒɪt/ noun [C] ► a small machine or piece of electronic equipment that has a particular purpose: latest/modern/new gadgets »With competition heating up, the latest gadgets have added features to set them apart from the competition.… …   Financial and business terms

  • gadget — |gâdgèt| s. m. Aparelho ou aplicação informática que se revela útil para determinada tarefa.   ‣ Etimologia: palavra inglesa …   Dicionário da Língua Portuguesa

  • gadget — index device (mechanism), item Burton s Legal Thesaurus. William C. Burton. 2006 …   Law dictionary

  • gadget — / gædʒit/, it. / gadʒ:et/ s. ingl. [etimo ignoto], usato in ital. al masch. [oggetto attraente ma per lo più inutile, spesso offerto in omaggio come richiamo pubblicitario] ▶◀ ‖ gingillo, ninnolo …   Enciclopedia Italiana

  • gadget — (n.) 1886, gadjet (but said to date back to 1850s), sailors slang word for any small mechanical thing or part of a ship for which they lacked, or forgot, a name; perhaps from Fr. gáchette catchpiece of a mechanism (15c.), dim. of gáche staple of… …   Etymology dictionary

  • gadget — /ˈɡadʒet, ingl. ˈɡædʒɪt/ s. m. inv. aggeggio inutile, oggetto curioso, gingillo …   Sinonimi e Contrari. Terza edizione

  • gadget — (izg. gàdžit) m DEFINICIJA zabavan, domišljat predmet, uređaj i sl., često bez prave korisne primjene ETIMOLOGIJA engl …   Hrvatski jezični portal

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”