Genesis: A high-resolution code for three-dimensional relativistic hydrodynamics

The main features of a three-dimensional, high-resolution special relativis tic hydro code based on relativistic Riemann solvers are described. The cap abilities and performance of the code are discussed. In particular, we pres ent the results of extensive test calculations that demonstrate that the co de can accurately and efficiently handle strong shocks in three spatial dim ensions. Results of the performance of the code on single and multiprocesso r machines are given. Simulations (in double precision) with less than or e qual to 7 x 10(6) computational cells require less than 1 Gbyte of RAM memo ry and approximate to 7 x 10(-5) CPU s per zone and time step (on a SCI Gra y-Origin 2000 with a R10000 processor). Currently, a version of the numeric al code is under development, which is suited for massively parallel comput ers with distributed memory architecture (such as, e.g., Cray T3E).