Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
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.
Matsuoka, Seikichi; Idomura, Yasuhiro; Satake, Shinsuke*
no journal, ,
Global full-f gyrokinetic simulations, in which the gyrokinetic equation is solved based on the first principle without the scale separation with respect to the plasma distribution function, is attracting much attention in the plasma transport study. However, global full-f gyrokinetic simulation studies in three-dimensional plasmas have been reported so far, since the existing global full-f gyrokinetic simulation codes are developed with the aim to explore the transport physics in axisymmetric tokamak plasmas. In this work, we extend a global full-f gyrokinetic simulation code, GT5D, to treat three-dimensional magnetic equilibria by constructing a new coordinate system. A new interface code between GT5D and a 3D equilibrium code, VMEC, are developed, in which outputs provided by VMEC code is incorporated into GT5D. The extended version of GT5D is verified against the collisional (neoclassical) transport by comparing the transport to another neoclassical code and an analytical theory.