Performance of parallel AMG-preconditioners in CFD-codes for weakly compressible flows

We examine the performance in terms of computing time of different parallel AMG algorithms that are applied within the context of industrial computational fluid dynamics (CFD) problems. We give an overview over the most important classes of algorithms described in literature, pick out four fundamentally different algorithms and perform numerical experiments on up to 16 processors with two benchmarks representing an important class of CFD-problems. The results indicate that aggregation-based algorithms have advantages compared to algorithms based on the concept of C–F-splitting.