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Idomura, Yasuhiro
no journal, ,
This talk reviews the present status of the fusion sub-project, which has been promoted under the Post-K priority issue from 2016. In order to simulate burning plasmas in ITER, which have enormous spatio-temporal scales, the extension of existing Peta-scale plasma simulations have been addressed at different levels including computing technologies, mathematical algorithms, numerical schemes, and physics models. In particular, the project focused mainly on the development of strong scaling computational techniques and multi-time-scale physics models in order to overcome a gap of time-scales. In this talk, several examples of such multi-time-scale simulations are presented, and the present status of verification and validation studies of developed codes is discussed.
Idomura, Yasuhiro
no journal, ,
We discuss Exa-scale computing techniques for the gyrokinetic toroidal 5D full-f Eulerian code GT5D, which have been developed under the Post-K project. Towards burning plasma simulations in ITER, we have extended physics models including kinetic electrons and multi-species ions. To compute the burning plasma model at the ITER scale, we need Exa-scale computing. To this end, techniques for utilizing many core processors with low power consumption and avoiding communication bottlenecks, which are revealed by accelerated computation. In this talk, we explain many core optimization techniques, communication overlap techniques, and communication-avoiding algorithms, which have been developed to resolve the above issues, and show their performance evaluations on the latest many core platforms such as the Plasma Simulator.
Idomura, Yasuhiro
no journal, ,
In this talk, we review the current status of the sub-project D "Core design of fusion reactor" in the Priority Issue on Post-K computer (Accelerated Development of Innovative Clean Energy Systems). In the project, an interdisciplinary research team consisting of experts on applied mathematics, computer science, plasma theory, and plasma experiment has addressed (1) development of exascale computing technologies, (2) extension of physics models for burning plasmas, and (3) V&V of developed codes against large scale experiments such as JT-60 and LHD. Outcomes from the first two years of the project are presented focusing on computing techniques and physics models for analyzing multi time scale phenomena such as transient responses of plasma turbulence against auxiliary heating and intermittent bursts of energetic particles driven modes, and future issues in the latter half of the project.