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The xns computational fluid dynamics code was successfully running on Blue Gene/L, however, its scalability was unsatisfactory until the first Jülich Blue Gene/L Scaling Workshop provided an opportunity for the application developers and performance analysts to start working together. Investigation of solver performance pinpointed a communication bottleneck(More)
A parallel solver for incompressible fluid flow simulation, used in biomedical device design among other applications, is discussed. The major compute-and communication-intensive portions of the code are described. Using unsteady flow in a complex implantable axial blood pump as a model problem, scalability characteristics of the solver are briefly(More)
Over the last decade, computer simulations of fluid flow have steadily gained acceptance as an effective tool for evaluation of design modifications. The flow features in complex geometries such as blood pumps, as well as the evolution of those features resulting from design changes, are hard to predict even by experienced design engineers. Linking a(More)
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