RIKEN Center for Computational Science

OVERVIEW 計算科学研究機構とは

Complex Phenomena Unified Simulation Research Team

Researching and Developing a Framework for Complex Phenomena Unified Simulations and Its Application to Industrial Problems

Most complex phenomena observed in manufacturing processes are relating to or coupled with other physical or chemical phenomenon such as turbulence diffusion, structure deformation, heat transfer, aeroacoustics, electromagnetic fields or chemical reactions. While the use of computer simulations is rapidly spreading in industry as a helpful engineering tool, their limitations of treating such coupled phenomena are come to be an important issue to be solved. This is because each simulation method has been optimized for a specific phenomenon, and once two or more solvers of different phenomena are coupled to deal with a complicated target, computational performance is seriously degraded. Thus our main objective is to establish a new simulation framework for complex and coupled phenomena by utilizing the HPC environment and to expand its use in engineering applications by fostering next-generation digital engineering.

For that purpose, we are researching and developing a unified simulation method called CUBE. Its goal is to solve multiple partial differential equations on the same hierarchically structured grid system. To date, we have singled out three main areas to improve this method. First, to speed up CUBE by considering next-generation hardware architecture and to realize real time simulations for industrial use. Second, to improve the accuracy of CUBE for dealing with coupled phenomena when realizing real world simulations for engineering applications, as this will expand the possibility of using simulations in real operating conditions. Third, to promote the sophisticated use of CUBE in manufacturing processes: For example, applying it to multi-objective optimization by utilizing assimilation of existing experimental data, or by applying deep learning to big data simulations.

Recent Achievements

Simulation of a Vehicle’s Coupled Aerodynamics and 6DoF-Motion in Real Driving Conditions
By developing a new hybrid Euler-Lagrangean moving boundary method for the immersed boundary technique, and implementing it in the CUBE unified simulation framework, we have made it possible to simulate vehicular aerodynamics coupled with 6DoF motion. We successfully conducted a real-world simulation of a vehicle in cornering conditions. To achieve this, we used both detailed and dirty CAD data (provided by an automotive OEM) and the wheel rotation together with the front wheels’ steering angle-change in order to reproduce the vehicle’s complicated shape. This innovative simulation makes it possible to evaluate high-speed drivability from CAD data only. This presents new manufacturing possibilities for vehicle makers by means of optimizing a vehicle’s total performance in an integrated manner at an early stage of development before real prototyping begins.

Simulation of coupled vehicle aerodynamics and 6DoF-motion utilyzing CUBE


Team Leader Makoto TSUBOKURA

Team Leader

Biography: Detail
Annual Report
FY2017 (PDF 2MB)
FY2016 (PDF 5MB)
FY2015 (PDF 7.69MB)
FY2014 (PDF 3.50MB)
FY2013 (PDF 7.67MB)
FY2012 (PDF 4.55MB)