Merging clusters and the formation of radio haloes

In this paper we present the preliminary result obtained from a set of cosmological numerical simulations run with the goal of describing self-consistently the evolution of the gas diffused in clusters of galaxies (Intra-Cluster Medium-ICM), including hydrodynamical and gravitational processes, in a cosmological framework. We have followed the details of the physical evolution of the ICM with particular attention to shock processes and merging events and their possible feedbacks the relativistic plasma. Furthermore, we have analyzed the details of the ICM dynamics in the most massive clusters, using tracers particles which follows the fluid in its motion.