[STT54-P02] Hybrid parallelization of Discrete Element Method (DEM): Toward a large-scale geotechnical HPC applications
キーワード：DEM、粒状体、HPC
Discrete element method (DEM) is one of the standard simulation methods originally developed for granular physics and it has been recently extended to multi-physics simulations with advanced interaction models of visco-elasto-plastic rheologies and thermo-chemical reactions. Recently, DEM has been extensively utilized in various fields of studies such as geotechnics, geoscience, civil engineering, industry, and disaster prevention problems. This study presents the implementation and performance demonstration of parallel DEM simulation based on an iterative load balancer. The proposed techniques were verified by the reproducibility test. The numerical sandbox and slump tests with certain DEM particles demonstrated the efficiency of the large-scale DEM to capture the multi-scale events in the granular media. The visualization of the stress chains from the large-scale DEM simulation reveals the existence of arcuate stress structures that may control accretionary prism formation, which is an important scientific discovery