Parallel Cfd on Commodity Processors

In recent years, the cost of microprocessors for PCs has reduced dramatically. This has led to the introduction of a new class of computing facility commonly known as Beowulf systems, in which commodity-off-the-shelf PCs and networking components are combined into a single cost-effective parallel system. We report our experiences in implementing a number of CFD codes on a 32-processor Beowulf-class system at CLRC’s Daresbury Laboratory. Codes, which were originally developed for Cray T3D and T3E systems, range through combustion DNS, external aerodynamics, LES and environmental codes. These codes have different features that allow the Beowulf system to be thoroughly tested. We find that, whilst the cost-effectiveness of these Beowulf systems can be demonstrated, there can be significant problems involved in porting applications to these machines. Results from our experiences will be presented and issues arising will be discussed. The performance of our Beowulf machine will be compared to more traditional parallel systems. David R. Emerson and Mike Ashworth.