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I have used versiojn 1.4 with limited success. It has a very very steep learning curve however its flexibility is incredible. You can do just about everything with it if you have the skills. It will do subsonic, supersonic, compressible, incompressible, combustion, and more.
I guess the really big advantage it has is the ease at which you can use multiple computers as a cluster to solve problems.
The best way to learn it is to go through the tutorials and examples until you find an example that is closest to your problem. Its also a good idea to verify your simulation environment against case with an actual experiment like the ahmed bluff body for car aeordynamics simulations.
The thing that has me excited is the EngineFoam application that will allow simulation of engine combustion.
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