Parallel Subdomain Coupling for non-matching Meshes in Alya

Domain Composition Methods are techniques to couple local solutions of physical problems, solved on local meshes, to obtain a global solution on the union of these meshes. This work consisted in implementing such techniques at the algebraic level, making the coupling independent of the physics to be considered. This approach enables us to solve multi-domain and multi-physics problems, using both single and multi-code approaches. Both explicit and implicit coupling were implemented, for surface and volume couplings. The implementation was carried out for distributed memory supercomputers, using MPI. Several physical examples demonstrate the reliability of the proposed implementation.