Performance and limits of a geotechnical centrifuge: DEM-LBM simulations of saturated granular column collapse

Webb, William; Turnbull, Barbara; Leonardi, Alessandro

Abstract

This study investigates the dynamics of granular flows in geotechnical centrifuge models, focusing on the effects of centrifugal and Coriolis accelerations. While conventional laboratory-scale investigations often rely on Froude scaling, geotechnical centrifuge modelling offers a unique advantage in incorporating stress-dependent processes that fundamentally shape flow rheology and dynamics. Using the Discrete Element Method (DEM) and the Lattice-Boltzmann Method (LBM), we simulate the collapse of a just-saturated granular column within a rotating reference frame. The model’s accuracy is validated against expected trends and physical experiments, demonstrating its strong performance in replicating idealised collapse behaviour. Acceleration effects on both macro- and grain-scale dynamics are examined through phase front and coordination number analysis, providing insight on how centrifugal and Coriolis accelerations influence flow structure and mobility. This work enhances our understanding of granular flow dynamics in geotechnical centrifuge models by introducing an interstitial pore fluid and considering multiple factors that influence flow behaviour over a wide parameter space.

Citation

Webb, W., Turnbull, B., & Leonardi, A. (2024). Performance and limits of a geotechnical centrifuge: DEM-LBM simulations of saturated granular column collapse. Granular Matter, 26(2), Article 32. https://doi.org/10.1007/s10035-024-01408-4

• Journal Article Type: Article
• Acceptance Date: Feb 5, 2024
• Online Publication Date: Mar 1, 2024
• Publication Date: 2024-05
• Deposit Date: Mar 4, 2024
• Publicly Available Date: Mar 7, 2024
• Journal: Granular Matter
• Print ISSN: 1434-5021
• Electronic ISSN: 1434-7636
• Publisher: Springer Verlag
• Peer Reviewed: Peer Reviewed
• Volume: 26
• Issue: 2
• Article Number: 32
• DOI: https://doi.org/10.1007/s10035-024-01408-4
• Keywords: Granular collapse, LBM, Just-saturated, DEM, Centrifuge modelling
• Public URL: https://nottingham-repository.worktribe.com/output/32158804
• Publisher URL: https://link.springer.com/article/10.1007/s10035-024-01408-4
• Additional Information: Received: 22 November 2023; Accepted: 5 February 2024; First Online: 1 March 2024; : ; : The authors declare that they have no conflict of interest.