This document describes the establishment of a computational grid devoted to fluid mechanics, using three clusters of PC localized respectively at INRIA Sophia-Antipolis, CEMEF Sophia-Antipolis and IUSTI Marseille. We will expose the encountered problems and the choices retained according to the computational ressources. In a first part , we briefly describe the MECAGRID project that aims to set-up a computational grid devoted to massivelly parallel computations in fluid dynamics. The starting points of the project are several clusters localized in the PACA area already used by several teams working in CFD. One of the main requirements of this project has been to be able to launch on this grid several codes using MPI with no modification of these codes. Then, we present an analysis of possible solutions for establishing this grid in chapter and a description of the selected system. The encountered problems are detailed throughout this chapter. We finally show some preliminary results in chapter and some examples of computations in chapter .