Contribution to the modeling of complex physical systems described by PDE 1 : a 2D multi- agent model for convection- diffusion Jean-Marie Dembele Université Cheikh Anta Diop – IRD (UR GEODES, ESPACE) Laboratoire Modélisation et Applications Thématiques dembele@ird.sn Christophe Cambier Université Paris 6. Laboratoire du Lip6. cambier@ird.sn We propose here a multi-agent approach to simulate transport phenomena described by PDEs. The agents-particle are inspired by particle elements (volume or mass) of particle methods such Smoothed Particle Hydrodynamics. They have with their autonomy, vicinity perception, capacity of rearrangement and evaluation of their mutual contribution. In order to compare our multi-agent system with the classical models, we implement a model in Netlogo (a multi-agent platform) to simulate the convection-diffusion transport in two dimensions. 1 Partial Differential Equations