On the sensitivity of DEM parameters on pile experiments
Publication date
2024-06-04
Document type
Forschungsartikel
Author
Jahn, Momme
Organisational unit
Publisher
Elsevier
Series or journal
Computational Particle Mechanics
ISSN
Periodical volume
11
Periodical issue
6
First page
2971
Last page
2993
Is referenced by
Peer-reviewed
✅
Part of the university bibliography
✅
Language
English
Abstract
The discrete element method (DEM) is suitable to investigate problems where large deformations occur especially in granular material. The fitting of reliable DEM parameters is crucial and a challenge which is caused by the high number of DEM parameters and the computational effort. Despite its drawbacks, a trial and error approach is often used for the DEM parameter calibration. The knowledge of the DEM parameter influence on the model response is necessary to improve the calibration and to check whether the experiment is suitable to calibrate specific parameters or not. It is possible to reduce the dimensionality of the optimisation problem by omitting parameters whose influence on the model response is negligibly small. One approach is to perform a global sensitivity analysis based on Sobol’ indices. A frequently used calibration experiment in literature is the pile experiment. The deviation between the experiment and the simulation is evaluated with the angle of repose. In the present paper, an algorithm to determine the angle of repose considering the three-dimensional shape of the heap is discussed. The global sensitivity analysis is performed for two different experimental heap set-ups. To decrease the computational effort of the sensitivity analysis, the model response is approximated with metamodels whose predictability is evaluated using the root mean squared error (RMSE) based on a separate sampling point set.
Version
Published version
Access right on openHSU
Metadata only access