Ramses is an open source code to model astrophysical systems. It describes self-gravitating, magnetised, compressible, radiative fluid flows with Adaptive Mesh Refinement (AMR), and has been widely used for cosmological simulations of the Universe, isolated as well as cosmological resimulations of individual galaxies, simulations of molecular clouds, star formation, supernovae remnants, accretion disks around black holes and planets. Ramses was written by Romain Teyssier, and is now used and developed by a growing community of astrophysicists all around the world, with many groups in France, United Kingdom, Danemark, South Korea and the United States.
The goal of this website is to promote the activities of the Ramses community in France and internationally. It is edited by the RAMSES SNO (see this page for more details about this structure).
Following the Ramses User Meeting 2025 in Strasbourg, a new version of Ramses with the developments made this year was released.
Horizon-MareNostrum (Ocvirk et al. 2008) The horizon simulations are a suite of simulations derived from the initial Horizon project and its flagship simulation, Horizon-MareNostrum (from the consortium between the Horizon project in France and the MareNostrum Numerical Cosmology Project in Spain). One essential goal of the Horizon project is to take into account the multi-scale…