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Title
Onset of sediment transport in mono- and bidisperse beds under turbulent shear flow
AuthorSeil, Philippe ; Pirker, Stefan ; Lichtenegger, Thomas
Published in
Computational Particle Mechanics, 2018, Vol. 5, Issue 2, page 203-212
PublishedSpringer International Publishing, 2018
LanguageEnglish
Document typeJournal Article
Keywords (EN)Lattice Boltzmann method / Discrete element method / Sediment transport / Bidisperse bed / Shields curve
URNurn:nbn:at:at-ubl:3-1722 Persistent Identifier (URN)
DOI10.1007/s40571-017-0163-6 
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Onset of sediment transport in mono- and bidisperse beds under turbulent shear flow [2.41 mb]
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Abstract (English)

In this paper, we present a study on the onset of sediment motion of particles under turbulent shear flow. We use a fully resolved coupled lattice Boltzmanndiscrete element solver to study the behavior of monodisperse and bidisperse beds of spheres. For monodisperse beds, we find that the onset of sediment motion is in agreement with the predictions with models from the literature. For bidisperse beds, segregation phenomena at a short timescale are found that lead to increased entrainment of larger particles. This shows that, in addition to long-term segregation phenomena such as riverbed armoring, segregation also occurs at much shorter timescales.

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CC-BY-License (4.0)Creative Commons Attribution 4.0 International License