- Title
- Development of a cohesive DEM parameter calibration protocol for bulk materials using rapid flow and low consolidation standard tests
- Creator
- Ajmal, Mohsin; Roessler, Thomas; Carr, Michael J.; Katterfeld, André
- Relation
- International Conference on Bulk Materials Storage, Handling and Transportation (13th : 2019 : Surfers Paradise, QLD.). 13th International Conference on Bulk Materials Storage, Handling and Transportation (ICBMH 2019) (Surfers Paradise, QLD. 09-11 July, 2019) p. 683-692
- Relation
- https://www.newcastle.edu.au/research/centre/cbspt/icbmh-2019/conference-program
- Publisher
- Engineers, Australia
- Resource Type
- conference paper
- Date
- 2019
- Description
- Use of Discrete Element Method (DEM) for simulating and calibrating bulk solids flow is a wellknown procedure in academia and industry. However, cohesion and adhesion is one field of DEM where a lot of questions still remain unanswered. Cohesive materials display a wide range of distinct and elusive properties which contribute towards their reduced flowability. Numerous models exist which explain cohesion in their own unique ways, however, the JKR model is widely used for cohesive simulations due to its robustness and the relatively wide area of applications. The JKR model tackles cohesion by introducing Surface Energy Density and increased particle overlap. Various parameter calibration and validation endeavours in recent years have been quite successful in answering those questions on a macroscopic level. In this work Draw Down and Angle of Repose experiments have been chosen for calibration as reference values, which can be classified as uniaxial low consolidation tests. Cohesive DEM simulations were performed using a combination of Friction coefficients, Young's Modulus and Surface Energy Density values. These were then compared with the reference experiments to narrow down to a specific set of parameters. Hence a systematic analytically driven calibration protocol will be established which can be used to calibrate a range of cohesive bulk materials. One of the limitations of DEM is the usage of reduced Young's Modulus to capture collision time scales for a stable simulation in manageable computational times. Reducing the Young's Modulus in a cohesive JKR simulation usually leads to unrealistic overlaps which can be mitigated by also reducing the Surface Energy Density. In order to obtain a good agreement between various cohesive DEM modelling parameters, the developed calibration exercise also helps in deciding to which extent these parameters can be reduced for a reasonable simulation, satisfying the standard experiments.
- Subject
- discrete element method (DEM); parameter estimation; simulation; computational intelligence; bulk solids flow
- Identifier
- http://hdl.handle.net/1959.13/1459988
- Identifier
- uon:45831
- Identifier
- ISBN:9781925627299
- Language
- eng
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