Ramses has been designed to study structure formation in the universe with high spatial resolution. The code is based on Adaptive Mesh Refinement (AMR) technique, with a tree based data structure allowing recursive grid refinements on a cell-by-cell basis. The N-body solver is very similar to the one developed for the ART code (Kravtsov et al. 97), with minor differences in the exact implementation. The hydrodynamical solver is based on a second-order Godunov method, a modern shock-capturing scheme known to compute accurately the thermal history of the fluid component. The accuracy of the code is carefully estimated using various test cases, from pure gas dynamical tests to cosmological ones. The specific refinement strategy used in cosmological simulations is described, and potential spurious effects associated to shock waves propagation in the resulting AMR grid are discussed and found to be negligible.

This website’s goal is to promote the activities of the Ramses community and is edited by the SNO Ramses.


  • Nov. 4-5

    Nov. 13-14

    May 12-14


  • A Census of the RAMSES Community

    A Census of the RAMSES Community

    The French astrophysics community is putting in place a service to help the international community to use and develop RAMSES in order to produce state-of-the-art simulations of astrophysical objects. This service initially relies on a commitment of 6 institutes in France (in Lyon, Paris, Saclay, Meudon, Strasbourg, and Nice) plus the benevolence of Princeton University,…


  • The Obelisk simulation

    The Obelisk simulation

    The Obelisk project is a radiation-hydrodynamical cosmological simulation following the assembly of a proto-cluster and its environment until z≃3 aiming to study the first 3 Gyr of evolution of the Universe, before the peak of cosmic star formation. Obelisk relies on state-of-the-art models to describe the physical processes necessary to simulate galaxies and their environment…