OpenFOAM

OpenFOAM is a free and open source software package developed by ESI-OpenCFD and other participants in the global OpenFOAM community. It has a broad user base in most areas of engineering and science, from both commercial and academic organizations.
OpenFOAM has a wide range of features to solve any problem, from complex fluid flows involving chemical reactions, turbulence and heat transfer, to solids dynamics and electromagnetism.