Tamaas (from تماس meaning "contact" in Farsi) is a high-performance rough-surface periodic contact code based on boundary and volume integral equations. The clever mathematical formulation of the underlying numerical methods (see e.g. 10.1007/s00466-017-1392-5 and arXiv:1811.11558) allows the use of the fast-Fourier Transform, a great help in achieving peak performance: Tamaas is consistently **two orders of magnitude faster** (and lighter) than traditional FEM!

This means we can tackle such difficult problems as elastoplastic contact of rough surfaces *with upwards of 100 million degrees-of-freedom* on a single compute node. The image below shows the plastic zone in the material bulk for such a simulation:

**GNU Affero General Public License**, so anyone is free to use it for whatever purpose, including research and commercial uses!

Their are a few repositories available under the umbrella of the project:

- rTAMAAS: the main trunk containing the latest source code
- rTAMAASPUB: the public release repository of Tamaas, containing the elastic contact codes
- rEXPOLIT: a helper library for symbolic integration in C++