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- W3138710064 abstract "Analytical and numerical solutions are developed to compute the threshold stress for the initiation of motion of sediment particles, from spherical to ellipsoidal, on inclined beds under boundary layer flows. The numerical model is based on the discrete element method and simulates the micro-mechanics of the sediment as an aggregate of rigid ellipsoids interacting by contact, while analytical solution establishes the basic dynamics for initiation of motion. In both models the coupling of grain motion with the flow dynamics is accomplished via drag, lift, buoyancy and seepage forces under turbulent velocity fluctuations by a one-way technique, since incipient motion does not modify substantially the flow. The comparison of both models and their extension to compute the threshold stress in terms of seepage, turbulent velocity fluctuations, bed inclination and particle orientations provide a better understanding of the onset of sediment particles. The parametric analyses cover a wide range of natural and usual conditions for incipient motion, showing that most of results fall within the variability range of the experiments. Additionally, these models are able to compute the initiation of motion for configurations not still tested in laboratory." @default.
- W3138710064 created "2021-03-29" @default.
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- W3138710064 date "2021-08-01" @default.
- W3138710064 modified "2023-09-23" @default.
- W3138710064 title "Modelling initial motion of non-spherical sediment particles on inclined and seeped beds" @default.
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- W3138710064 doi "https://doi.org/10.1016/j.apm.2021.03.017" @default.
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