Re:openFOAM (Score 1)

I have (tried) to work with OpenFOAM in the past, and I would very much not recommend it for someone who doesn't already have an intimate knowledge of CFD. It has a very steep learning curve and no GUI whatsoever anymore. It may be powerful and free, but it is not appropriate for OP's needs. As far as I can tell it was formerly a commercial code that was open-sourced, but they keep it as non-intuitive as possible to try to sell people on the $2000 dollar training courses they put on.