For limited time, you can receive the 3-D Navier-Stokes solver PAB3D limited edition free of charge. The limited edition will have all the options except it will limit the problem size to 500,000 grid points and the number of distributed computers to 4.
The PAB3D code, which was developed at NASA Langley Research Center,
solves the three-dimensional Reynolds-averaged Navier-Stokes equations with a finite-volume formulation on structured multi-block grids. The flow solver has a robust (production quality) two-equation k-epsilon turbulence models with anisotropic algebraic Reynolds stress models. PAB3D also has the capability of modeling standard air real-gas effects. The code is capable of working in multiprocessors and distributed computer systems (CFD on Inexpensive Clustered Computers). This code has been used to simulate complex aerodynamic flow configurations and is currently being used in several national programs.
If you are interested, please fill the download registration form at http://www.eagle.com/demopab3d.html. The PAB3D solver has been tested using several operating systems, such as, LINUX, MAC, WINDOWS, SGI, SUN, and HP.