deal.II — an open source finite element library

What it is: A C++ software library supporting the creation of finite element codes and an open community of users and developers. (Learn more.)

Mission: To provide well-documented tools to build finite element codes for a broad variety of PDEs, from laptops to supercomputers.

Vision: To create an open, inclusive, participatory community providing users and developers with a state-of-the-art, comprehensive software library that constitutes the go-to solution for all finite element problems.

deal.II is open source and available for free!
There are many resources for learning deal.II and asking for help.
deal.II is a community project. We welcome all who want to participate!


2015/12/07: Deal.II Users and Developers Training Announcement is out!
The deal.II Users and Developers training will be held in Trieste (Italy) from the 21st to the 24th of March 2016. More information on the workshop webpage.
2015/09/01: Users and Developers Workshop 2015 slides are posted
The slides of talks at the Fifth Users and Developers Workshop are now available at here.
2015/08/01: Version 8.3 released
deal.II version 8.3 was released today. A full list of changes can be found here. Download links are on the download page, or the release page on github.
2015/03/10: Users and Developers Workshop 2015 announcement is out!
The Fifth Users and Developers Workshop will happen August 3-7, 2015 in College Station, TX. For more information, see here. The registration deadline is April 15, 2015.
2015/01/01: Version 8.2 released
deal.II version 8.2 was released today. A full list of changes can be found here. Download links are on the download page, or the release page on github.
2014/11/06: step-54 describes dealing with OpenCascade geometries
step-54 (developed by Andrea Mola and Luca Heltai) demonstrates how to use existing IGES CAD files to describe the boundary of your geometry. This is the first example that uses the new support for the OpenCASCADE ( library.
2014/10/13: step-52 introduces time steppers
step-52 (developed by Bruno Turcksin and Damien Lebrun-Grandie) explains how to use deal.II's built-in time stepping methods, including explicit, implicit, and embedded Runge-Kutta methods.

(older news)


The primary means of communicating with deal.II developers and users is by email:

The deal.II discussion group is used by developers to announce new features and by users to ask questions about how to do things with deal.II. This is also the forum to post bug reports. It may not be used for job offers and to ask for internships!.

Send email to Wolfgang Bangerth, Guido Kanschat, Timo Heister, or Matthias Maier if you have questions about obtaining deal.II, license issues and anything that applies to the library immediately.

We appreciate comments and suggestions on deal.II. They can be addressed to either of the addresses above, depending on their public or private nature.

Legal Notice: Some countries' laws require us to post this legal notice. Please write to the responsible federal judges if you find this silly.