High Performance Computing in Science and Engineering ’99: by Prof. Dr. Werner Hanke, Prof. Dr. Hans Ruder (auth.), Egon

By Prof. Dr. Werner Hanke, Prof. Dr. Hans Ruder (auth.), Egon Krause, Willi Jäger (eds.)

The booklet includes experiences concerning the most important tasks from technological know-how and engineering of the Federal excessive functionality Computing middle Stuttgart (HLRS). They have been rigorously chosen in a peer-review strategy and are showcases of an leading edge mix of state of the art modeling, novel algorithms and using modern parallel desktop know-how. The tasks of HLRS are utilizing supercomputer structures operated together by means of collage and and for that reason a unique emphasis has been wear the commercial relevance of effects and methods.

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Additional resources for High Performance Computing in Science and Engineering ’99: Transactions of the High Performance Computing Center Stuttgart (HLRS) 1999

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Copying values from and to ghost particles, i. , communication between processors, occurs when a particle changes its state. It is possible to delay changing the state of a particle for some time. This delay can be used to hide the time spent on communication. This delay also increases the size of the interaction list and thus acts as a tuning parameter for a size vs. speed tradeoff. 4 Load Balancing Distributing the problem in the way outlined above is relatively inflexible with respect to load balancing.

Only a particle's neighbors within a distance of the smoothing length h contribute to the above SPH sums. Because SPH is a grid-free method, complicated geometries are relatively easy to model. The local resolution of SPH can be enhanced considerably by allowing for a variable smoothing length. The disadvantage of the method is that neighborhood relationships change with time and have to be reestablished every time the particle positions have changed. 3 S. Kunze et al. Physical Viscosity The viscous interactions are implemented according to the viscous stress tensor in the Navier-Stokes equation (Flebbe et al.

It is also possible to compute displacement fields and energy difference maps if reference states are stored at the beginning of a simulation. Online Visualization. Large simulations on massively-parallel supercomputers require completely new concepts to deal with the overwhelming flood of data: If there are ten to hundred million particles and the simulation is carried out for several hundred thousand or million steps it is impossible to store the complete particle configurations, even at infrequent time intervals.

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