About OpenFOAM

OpenFOAM is a free, open source CFD software released and developed by OpenCFD Ltd since 2004. It has a large user base across most areas of engineering and science, from both commercial and academic organisations. OpenFOAM has an extensive range of features to solve anything from complex fluid flows involving chemical reactions, turbulence and heat transfer, to acoustics, solid mechanics and electromagnetics. See documentation

OpenFOAM is professionally released every six months to include customer sponsored developments and contributions from the community - individual and group contributors, integrations (eg, from FOAM-extend and OpenFOAM Foundation Ltd) as well as governance guided activities.

License

OpenFOAM is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. See the file COPYING in this directory or http://www.gnu.org/licenses/, for a description of the GNU General Public License terms under which you may redistribute files.

OpenFOAM Trademark

OpenCFD Ltd grants use of its OpenFOAM trademark by Third Parties on a licence basis. ESI Group and OpenFOAM Foundation Ltd are currently permitted to use the Name and agreed Domain Name. For information on trademark use, please refer to the trademark policy guidelines.

Please contact OpenCFD if you have any questions about the use of the OpenFOAM trademark.

Violations of the Trademark are monitored, and will be duly prosecuted.

Using OpenFOAM

If OpenFOAM has already been compiled on your system, simply source the appropriate etc/bashrc or etc/cshrc file and get started. For example, for the OpenFOAM-v2506 version:

source /installation/path/OpenFOAM-v2506/etc/bashrc

Compiling OpenFOAM

If you are compiling OpenFOAM from source, please see the relevant guides:

Location	Readme	Requirements	Build
OpenFOAM	readme	system requirements	build
ThirdParty	readme	system requirements	build

If you need to modify the versions or locations of ThirdParty software, please read how the OpenFOAM configuration is structured.

How do I know which version I am currently using?

The value of the $WM_PROJECT_DIR or even $WM_PROJECT_VERSION are not guaranteed to have any correspondence to the OpenFOAM release (API) value. If OpenFOAM has already been compiled, the build-time information is embedded into each application. For example, as displayed from blockMesh -help:

Using: OpenFOAM-com (2012) - visit www.openfoam.com
Build: b830beb5ea-20210429 (patch=210414)
Arch:  LSB;label=32;scalar=64

This output contains all of the more interesting information that we need:

item	value
version	com (eg, local development branch)
api	2012
commit	b830beb5ea
author date	20210429
patch-level	(20)210414
label/scalar size	32/64 bits

The Arch information may also include the solveScalar size if different than the scalar size.

As can be seen in this example, the git build information is supplemented by the date when the last change was authored, which can be helpful when the repository contains local changes. If you simply wish to know the current API and patch levels directly, the wmake -build-info provides the relevant information even when OpenFOAM has not yet been compiled:

$ wmake -build-info
make
    api = 2012
    patch = 210414
    branch = master
    build = 308af39136-20210426

Similar information is available with foamEtcFile, using the -show-api or -show-patch options. For example,

$ foamEtcFile -show-api
2012

$ foamEtcFile -show-patch
210414

This output will generally be the easiest to parse for scripts. The $FOAM_API convenience environment variable may not reflect the patching changes made within the currently active environment and should be used with caution.

ThirdParty directory

OpenFOAM normally ships with a directory of 3rd-party software and build scripts for some 3rd-party software that is either necessary or at least highly useful for OpenFOAM, but which are not necessarily readily available on every operating system or cluster installation.

These 3rd-party sources are normally located in a directory parallel to the OpenFOAM directory. For example,

/path/parent
|-- OpenFOAM-v2506
\-- ThirdParty-v2506

There are, however, many cases where this simple convention is inadequate:

• When no additional 3rd party software is actually required (ie, the operating system or cluster installation provides it)

• When we have changed the OpenFOAM directory name to some arbitrary directory name, e.g. openfoam-sandbox2412, etc..

• When we would like any additional 3rd party software to be located inside of the OpenFOAM directory to ensure that the installation is encapsulated within a single directory structure. This can be necessary for cluster installations, or may simply be a convenient means of performing a software rollout for individual workstations.

• When we have many different OpenFOAM directories for testing or developing various different features but wish to use or reuse the same 3rd party software for them all.

The solution for these problems is a newer, more intelligent discovery when locating the ThirdParty directory with the following precedence:

1. PROJECT/ThirdParty
   • for single-directory installations
2. PREFIX/ThirdParty-VERSION
   • this corresponds to the traditional approach
3. PREFIX/ThirdParty-vAPI
   • allows for an updated value of VERSION, eg, v2506-myCustom, without requiring a renamed ThirdParty. The API value would still be 2412 and the original ThirdParty-v2506/ would be found.
4. PREFIX/ThirdParty-API
   • same as the previous example, but using an unadorned API value.
5. PREFIX/ThirdParty-common
   • permits maximum reuse for various versions, for experienced users who are aware of potential version incompatibilities

If none of these directories are found to be suitable, it reverts to using PROJECT/ThirdParty as a dummy location (even if the directory does not exist). This is a safe fallback value since it is within the OpenFOAM directory structure and can be trusted to have no negative side-effects. In the above, the following notation has been used:

name	value	meaning
PROJECT	$WM_PROJECT_DIR	The OpenFOAM directory
PREFIX	dirname $WM_PROJECT_DIR	The OpenFOAM parent directory
API	foamEtcFiles -show-api	The api or release version
VERSION	$WM_PROJECT_VERSION	The version we have chosen

To reduce the potential of false positive matches (perhaps some other software also uses ThirdParty-xxx for its naming), the directory test is accompanied by a OpenFOAM-specific sanity test. The OpenFOAM ThirdParty directory will contain either an Allwmake file or a platforms/ directory.

Useful Links

• Download source and download and installation instructions
• Documentation
• Reporting bugs/issues/feature requests
• Issue tracker
• Code wiki and General wiki
• Governance, Governance Projects
• Contacting OpenCFD

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