The documentation consists firstly of a User Guide that contains information
about the general running of OpenFOAM, I/O data structures, compilation,
applications, libraries, mesh generation, post-processing and more.
Click User Guide (HTML) to access the HTML version of the guide on this site.
Release Announcement provides information on new features of the latest OpenFOAM release and hints for upgrading to version 2.1.1.
OpenFOAM is open source. The source code of OpenFOAM is a vital source of documentation in itself. As well as the actual code itself, most applications, for example, contain descriptions of what they do, there are descriptions of various models with supporting references, etc..
The use of most applications can be learnt by looking at the corresponding example case in the $FOAM_TUTORIALS directory in the OpenFOAM release. The Allrun scripts show how many applications are executed.