OpenFOAM version 3.0.0 is the first major new version of OpenFOAM since 2011, which breaks some backward compatibility with the version 2 release that require some changes to one or two case files. It is is a snapshot of the OpenFOAM-dev repository, launched following the release of version 2.3.1 in December 2014, that includes over 800 code commits. Version 3.0.0 is distributed as:

• a packaged installation for Ubuntu Linux — the simplest installation option for OpenFOAM;
• a source pack for compilation on other Linux distributions.

OpenFOAM version 2.4.0 is a minor release of OpenFOAM with changes to some internal API, new features particularly relating to pre- and post-processing, and further bug fixes to version 2.3.1. It includes over 200 code commits and almost 800 file changes. Version 2.4.0 is distributed as:

• a packaged installation for Ubuntu Linux — the simplest installation option for OpenFOAM;
• a source pack for compilation on other Linux distributions.

OpenFOAM 2.3.1 is a patch release of version 2.3.0 that fixes critical bugs and improves usability and consistency in the code with over 400 code commits and over 800 file changes. As a patch release, we strongly recommend users of v2.3.0 upgrade to this version. Version 2.3.1 is distributed as:

• a packaged installation for Ubuntu Linux — the simplest installation option for OpenFOAM;
• a source pack for compilation on other Linux distributions.