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  3. Two-dimensional sub-aerial, submerged, and transitional granular slides
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Two-dimensional sub-aerial, submerged, and transitional granular slides

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Type de ressource
Article de revue
Auteurs/contributeurs
  • Pilvar, M. (Auteur)
  • Pouraghniaei, M. J. (Auteur)
  • Shakibaeinia, A. (Auteur)
Titre
Two-dimensional sub-aerial, submerged, and transitional granular slides
Résumé
The slide of granular material in nature and engineering can happen under air (subaerial), under a liquidlike water (submerged), or a transition between these two regimes, where a subaerial slide enters a liquid and becomes submerged. Here, we experimentally investigate these three slide regimes (i.e., subaerial, submerged, and transitional) in two dimensions, for various slope angles, material types, and bed roughness. The goal is to shed light on the complex morphodynamics and flow structure of these granular flows and also to provide comprehensive benchmarks for the validation and parametrization of the numerical models. The slide regime is found to be a major controller of the granular morphodynamics (e.g., shape evolution and internal flow structure). The time history of the runout distance for the subaerial and submerged cases present a similar three-phase trend (with acceleration, steady flow, and deceleration phases) tough with different spatiotemporal scales. Compared to the subaerial cases, the submerged cases show longer runout time and shorter final runout distances. The transitional trends, however, show additional deceleration and reacceleration. The observations suggest that the impact of slide angle, material type, and bed roughness on the morphodynamics is less significant where the material interacts with water. Flow structure, extracted using a granular particle image velocimetry technique, shows a relatively power-law velocity profile for the subaerial condition and strong circulations for the submerged condition. An unsteady theoretical model based on the µ(I) rheology is developed and is shown to be effective in the prediction of the average velocity of the granular mass.
Publication
Physics of Fluids
Volume
31
Numéro
11
Date
2019-11-01
Langue
en
DOI
10.1063/1.5121881
ISSN
1070-6631, 1089-7666
URL
https://pubs.aip.org/pof/article/31/11/113303/1074852/Two-dimensional-sub-aerial-submerged-and
Consulté le
2024-01-22 00 h 46
Catalogue de bibl.
DOI.org (Crossref)
Référence
Pilvar, M., Pouraghniaei, M. J., & Shakibaeinia, A. (2019). Two-dimensional sub-aerial, submerged, and transitional granular slides. Physics of Fluids, 31(11). https://doi.org/10.1063/1.5121881
Membres du RIISQ
  • Shakibaeinia, Ahmad
Lien vers cette notice
https://bibliographies.uqam.ca/riisq/bibliographie/FSG2HU46

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