Computer Science Research and Development Office

Computer Science Research and Development Office promotes R&D in computer science and simulation technologies, which support computational nuclear engineering.

| Research Topics


| Complex Fluid Simulations

We develop GPU-based exascale CFD simulations towards real-time wind and plume dispersion analyses, which are needed for the prediction of plume dispersion in nuclear accidents and the design and operation of smart cities.

・Real-time wind simulation for a 4km x 4km area in metropolitan Tokyo(movie:


・Real-time plume dispersion simulation on the DGX-2


・Weak scalability of the CityLBM code on GPU supercomputers


| High Performance Computing Technology

We develop accelerator optimization techniques and parallel computing technologies for exascale computing.

(Poisson solver for hundreds billion grids systems using a CG method with a communication-avoiding multigrid preconditioner)


[Communication avoiding multigrid preconditioned conjugate gradient method for extreme scale multiphase CFD simulations, Y. Idomura, T. Ina, S. Yamashita, N. Onodera, S. Yamada, and T. Imamura, 2018 IEEE/ACM 9th Workshop on Latest Advances in Scalable Algorithms for Large-Scale Systems (scalA), Dallas, TX, USA, 2018, pp. 17-24.]


| Large-scale Visualization Technology

We develop large-scale parallel visualization technologies for exascale simulations and technologies for visualizing multivariable data obtained from complex simulations.

・Remote Visualization System PBVR


・A framework for visualizing simulations on a supercomputer simultaneously with computation


・Synthesis and visualization of multivariable data by user input algebraic formula


| Technology related to Fukushima recovery

To support the monitoring activities of radioactive materials associated with the accident at TEPCO Fukushima Daiichi Nuclear Power Plant, we have developed and operated the Environmental Monitoring Database and the Route Bus Survey System.

(Top page of Environmental Monitoring Database: )


(Measurement of air dose rates by route buses in Fukushima Prefecture: )


| Member