Further developments in the multiblock hybrid CFD solver elsA-H

Over the past few years, ONERA has been working on the extension of the multiblock structured solver elsA to hybrid-grid con gurations. By hybrid grids, we mean those in which structured (ijk-based) and unstructured blocks coexist within the same computational domain. We have called the new solver elsA-H. This approach has a number of advantages which are highlighted in this work. In this paper, we review the hybrid-grid algorithms upon which elsA-H relies, focusing on the particular handling of matching-grid interfaces. We also report recent progress on the parallelisation of such algorithms, as well as on the development of an appropriate hybrid-grid load-balancing tool. Finally, we present preliminary work on the implementation of a hybrid multigrid algorithm into elsA-H. A number of simulation results for several unstructured and hybrid-grid con gurations are reported in this paper.