Hubert Hirtz, PhD student at CEA, under the direction of Franck Ledoux and the supervision of Cédric Chevalier and Sébastien Morais, works on mesh partitioning for load-balancing multi-phyisic simulations. The goal of this thesis is to develop tools and algorithms to better address the load balancing problems the CEA faces on large-scale simulations. This means, in particular, making sure, the fastest way possible, that each computation unit is responsible for an suitable amount of work, in order to speed up HPC codes.