OpenFOAM
A computational fluid dynamics (CFD) toolbox for complex fluid flows including incompressible and compressible flow, turbulence modeling, multiphase flows, and heat transfer. Supports both transient and steady-state simulations.
Citation
Weller, H.G. et al. A tensorial approach to computational continuum mechanics using object-oriented techniques. Computers in Physics. 12, 620-631 (1998). DOI:10.1063/1.168744