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SCHEDULE: NOV 16-21, 2014

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Greater than 10x Acceleration of Fusion Plasma Edge Simulations Using the Parareal Algorithm

SESSION: Poster Reception


TIME: 5:15PM - 7:00PM

AUTHOR(S):Debasmita Samaddar, David P. Coster, Xavier Bonnin, Christoph Bergmeister, Eva Havlickova, Wael R. Elwasif, Lee A. Berry, Donald B. Batchelor

ROOM:New Orleans Theater Lobby


Simulations involving the edge of magnetically confined, fusion plasma are an extremely challenging task. The physics in this regime is particularly complex due to the presence of neutrals and the device wall. These simulations are extremely computationally intensive but are key to rapidly achieving thermonuclear breakeven on ITER-like machines. Space parallelization has hitherto been the most common approach to the best of our knowledge . Parallelizing time adds a new dimension to the parallelization thus significantly increasing computational speedup and resource utilization. This poster describes the application of the parareal algorithm to the edge-plasma code package – SOLPS. The algorithm requires a coarse (G) and a fine (F) solver – and optimizing G is a challenge. This work explores two approaches for G leading to computational gain >10 which is significant for simulations of this kind. It is also shown that an event-based approach to the algorithm greatly enhances performance.

Chair/Author Details:

Debasmita Samaddar - Culham Centre for Fusion Energy/UK Atomic Energy Authority

David P. Coster - Max Planck Institute of Plasma Physics

Xavier Bonnin - National Center for Scientific Research

Christoph Bergmeister - University of Innsbruck

Eva Havlickova - Culham Centre for Fusion Energy/UK Atomic Energy Authority

Wael R. Elwasif - Oak Ridge National Laboratory

Lee A. Berry - Oak Ridge National Laboratory

Donald B. Batchelor - Oak Ridge National Laboratory

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