Lethe (pronounced /ˈliːθiː/) is open-source computational fluid dynamics (CFD) software which uses high-order continuous Galerkin formulations to solve the incompressible Navier–Stokes equations (among others). Lethe contains a family of solvers that are based on deal.II, a finite element library. Through deal.II, Lethe uses Trilinos for its sparse linear algebra routines and p4est for its distributed adaptative quadtrees and octrees.

Lethe is named after the river of forgetfulness, which, according to Wikipedia,

is one of the five rivers of the Greek underworld[,] the other four [being] Acheron (the river of sorrow), Cocytus (the river of lamentation), Phlegethon (the river of fire) and Styx (the river that separates Earth and the Underworld). … The shades of the dead were required to drink the waters of the Lethe in order to forget their earthly life.

Lethe is described here. It originally began as a weekend project, but slowly grew into CFD, DEM and CFD-DEM software used in actual research. Lethe is under active development.

Note: Lethe would not exist without the dedicated work of the deal.II authors. The authors of Lethe would like to emphasize that without deal.II, dedicated solvers like Lethe could not exist.

Documentation, tutorials, and more can be found here.

Follow the instructions in the documentation.

Main developer:

• Bruno Blais

Contributors (in alphabetical order):

• Antoine Avrit
• Amishga Alphonius
• Lucka Barbeau
• Valérie Bibeau
• Audrey Collard-Daigneault
• Carole-Anne Daunais
• Toni El Geitani
• Simon Gauvin
• Shahab Golshan
• Marion Hanne
• Jeanne Joachim
• Rajeshwari Kamble
• Martin Kronbichler
• Charles Le Pailleur
• Ghazaleh Mirakhori
• Peter Munch
• Victor Oliveira Ferreira
• Hélène Papillon-Laroche
• Paul Patience
• Catherine Radburn
• Philippe Rivest
• Laura Prieto Saavedra

This project is licensed under the LGPL-2.1 license.

Unless you explicitly state otherwise, any contribution intentionally submitted by you for inclusion in this project shall be licensed as above, without any additional terms or conditions.