QUANTIFICATION OF PARAMETER CONTRUBUTION IN GRANULAR FLOW SIMULATIONS USING THE DISCRETE ELEMENT METHOD

Abstract

This study aims to quantify the contribution of input parameters in granular flow simulations using DEM. A granular flow simulation with simple condition is performed using DEM under the different combination of the input parameters. Indexes that related to the traveling distance are defined, and surrogate models of the DEM simulation are built with the help of the radial basis function interpolation. The Monte Carlo Simulation is then carried out with quantified contribution rate of the input parameters. According to the results, the basal friction is the most important parameter, but the restitution coefficient strongly contributes characteristic of the front part. It was also found that the spring codfficient and friction angle between elements don’t have strong contribution.