A MULTIDIMENSIONAL HYDRODYNAMIC CODE FOR STRUCTURE EVOLUTION IN COSMOLOGY

A multidimensional cosmological hydrodynamic code is described and tes ted. This code is based on modern high-resolution shock-capturing tech niques. It can make use of a linear or a parabolic cell reconstruction as well as an approximate Riemann solver. The code has been specifica lly designed for cosmological applications. Two tests including shocks have been considered: the first is a standard shock tube, and the sec ond involves a spherically symmetric shock. Various additional cosmolo gical tests are also presented. In this way, the code's performance is demonstrated. The usefulness of the code is discussed; in particular, this powerful tool is expected to be useful for studying the evolutio n of the hot gas component located inside asymmetric cosmological stru ctures.