It's weird that ParMETIS chose to divide the partitions with non-straight lines (e.g. see the curved boundary between the dark blue and dark green partitions). After all, straight boundaries would reduce the boundary lengths, thus reducing the amount of data that needs to be sent between different processors. Does anyone have any insight into why ParMETIS might be choosing non-straight boundaries?
Why do the partitions vary so much in size? Is this because of the different computation power of different computer nodes?
@bochet: If you look at the next slide you'll notice that the mesh is divided into element more finely close to the airplane wing (the interior white region above). This is probably because the highest pressures in the simulation are in this region of space so the domain needs to be discretized most finely in these areas to maintain high numerical accuracy.