a nice article here about open source CFD. I agree with most of it. I especially stand for the following:
The solution may be NOT for you, if:
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you are doing commercial projects, but you feel CFD license is too expensive;
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nobody in the team has direct (not just self-claimed) experience with programming experience in C/C++/FORTRAN;
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you are imprisoned in a Windows-only environment (maybe by your IT dept.)
zeracuse 