Development of computing technologies for extreme scale CFD simulations on many core platforms

Idomura, Yasuhiro   

This talk reviews computing technologies developed for extreme scale nuclear CFD simulations on latest many core computing platforms. At JAEA, there are needs for extreme scale CFD simulations for analyzing critical issues such as melt relocation behavior of nuclear reactors at severe accidents and environmental dynamics of radioactive substances. Although the latest many core platforms offer promising solutions for such high computing needs, accelerated computation reveals severe bottlenecks of inter-node communication and data I/O. To resolve these issues, we have developed novel communication-avoiding matrix solvers and an In-Situ visualization system for the three dimensional multi-phase and multi-component thermal hydraulic core, JUPITER, and their performances were demonstrated in on the Oakforest-PACS, which consists of 8,208 XeonPhi7250 (KNL) processors.