is it in public domain? i am interested in its capability to simulate jet flows.

The main author of PAB is Dr. Khalid Abdol-Hamid. The current version is for sale by his company, AS&M. Hamid's email is hamid@kha2.larc.nasa.gov. You may also contact Paul Pao or John Carlson of NASA Langley.

We at NASA Glenn have evaluated PAB against similar production flow RANS solvers. PAB is one of the better codes out there for jet flow simulations (although in my opinion all RANS solvers have severe deficiencies for compressible jet simulations). PAB is very fast and has one of the better sets of turbulence models available to the user.

thank u!