Development of the Next-generation Computational Solid Mechanics Simulator for a Virtual Demonstration Test Group Representative

We have been developing an advanced general-purpose computational mechanics system, named ADVENTURE, which is designed to be able to analyze a three-dimensional (3D) finite element model of arbitrary shape with a 10–100 million degrees of freedom (DOF) mesh. Module-based architecture of the system with standardized I/O format and libraries are developed and employed to attain flexibility, portability, extensibility and maintainability of the whole system. Domain-decompositionbased parallel algorithms are also implemented in pre-processes (domain decomposition), main processes (system matrix assembling and solutions) and post-processes (visualization), respectively. The hierarchical domain decomposition method (HDDM) with a preconditioned iterative solver is adopted in the main processes as one of the major solution techniques. The one of main processes module for solid analysis has been implemented on the Earth Simulator consisting of 128 nodes, i.e. 1,024 processing elements (PEs), and applied for an elastostatic analysis of a precise nuclear vessel model of 35 million DOF mesh with 1.9 TFLOPS, which is 23.75% of the peak performance. In this report, the solid analysis module is successfully applied for an implicit dynamic elastic analysis such as seismic response of a nuclear vessel model and implemented on the 256 nodes, i.e. 2,048 PEs. It succeeds in solving an elastostatic problem of a nuclear pressure vessel model of 100 million DOF mesh with 5.08 TFLOPS, which is 31.75% of the peak performance.