CoMMA (COarse Mesh Multigrid Agglomerator) is a suite of graph algorithms meant to operate on the graph representation of an unstructured computational mesh.

The final objective is to give a map between the fine cells and coarse cells in the object representing the coarse cell graph.

The main features of CoMMA are:

Sequential by zone (i.e., no coupling with graph partitioner);
Fine faces conservation for coarse levels;
Optimization of the shape of the coarse cells w.r.t. their aspect ratio;
Connectivity of coarse cells;
Detection and treatment of anisotropic regions;
Isotropic agglomeration with structured-like treatment of structured-like regions.

CoMMA is a header-only library. A python module can be generated using pybind11.

The interface to CoMMA is very simple and consists in only one function agglomerate_one_level.

In CoMMA repository, one can find some documentation, such as the user manual and a note about the aspect ratio, quantity that plays a pivotal role in the agglomeration.

Other info

Authors: Nicolas Lantos, Alberto Remigi, and Riccardo Milani

Contributors: Karim Anemiche

Licence: This project is released under the Mozilla Public License 2.0