OpenFOAM - History
Written by cfd.ninja
OpenFOAM began at Imperial College London in the late 1980s as a C++ library for solving continuum mechanics problems, and was released as open source in 2004 under the GPL.
The name itself describes the architecture: Field Operation And Manipulation. Its distinguishing feature is that the equations are written in code in a form close to their mathematical notation, which is why adding a term or writing a new solver is a realistic task rather than a research project.
Since 2014 development has continued along parallel lines, with releases from the OpenFOAM Foundation and from ESI, plus the community maintained foam-extend. The differences matter in practice, because a tutorial written for one release does not always run unchanged on another.
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