DEUS consortium is developping the largest cosmological Dark Matter simulations to date with realistic Dark Energy component, involving billions of particules, with highest spatial resolution for the<br />largest set of simulated Universe. Our challenge is to reproduce with<br />unprecedented details the cosmic structure formation process and<br />answer to the fundamental questions: what can we learn on Dark Energy from Large Scale Structure Formation (LSS) ? and How LSS<br />formation process is affected by the presence of Dark Energy ? and then to understand the nature of the Dark Energy.<br />www.deus-consortium.org, Contact: jean-michel.alimi@obspm.fr