Evaluation of Multi-threaded OpenFOAM Hybridization for Massively Parallel Architectures

The performance results from the hybridization of the OpenFOAM linear system solver, tested on the CINECA Fermi and the HLRS Hermit supercomputers are presented in this paper. A comparison between the original and the hybrid OpenFOAM versions on four physical problems, based on four different solvers, will be shown and a detailed analysis of the behavior of the main computing and communication phases, which are responsible for scalability during the linear system solution, will be given