P21: The First Real-Scale DEM Simulation of a Sandbox
Experiment Using 2.4 Billion Particles
SessionPoster Reception
Event Type
ACM Student Research Competition
Poster
Reception
TimeTuesday, November 14th5:15pm -
7pm
LocationFour Seasons Ballroom
DescriptionA novel implementation of the Discrete Element Method
(DEM) for a large parallel computer system is presented
to simulate a sandbox experiment with realistic particle
sizes. To save memory in the pairwise tangential forces
and halve the arithmetic costs, interactions are
calculated using the action-reaction law. An iterative
load-balancer the flexible 2D orthogonal domain
decomposition is applied to overcome the load-imbalance
problem caused by the Lagrangian nature of DEM. An
overlapping communication technique combined with
cell-ordering with space-filling curves is also applied
to hide the overhead cost because of the MPI
communication tasks. We verify our complex parallel
implementation with the action-reaction law via a
reproducibility test. The parallel scaling test shows
good strong, and weak scalabilities up to 2.4 billion
particles on the Earth Simulator and the K computer. The
world’s first real-scaled numerical sandbox simulation
successfully captures the characteristics of real
observations.
