A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Analytical and discrete solutions for the incipient motion of ellipsoidal sediment particles
This work introduces analytical and numerical approaches to compute the incipient motion of ellipsoidal sediment particles. Initiation of motion of spherical particles is dominated by rolling mode. However, solutions for initiation of motion for non-spherical grains have to incorporate rolling, sliding, and mixed modes. The proposed approaches include a wide variety of shapes and inclinations that represent realistic configurations of sediment bed layers. The numerical procedure is based on the discrete element method, simulating the micro-mechanics of the sediment as an aggregate of rigid ellipsoids interacting by contact. The numerical solution covers a range of incipient movements that cannot be covered by the analytical approach. Hence, some trapped modes observed in analytical calculations are complemented by the numerical computation of threshold stresses. The main results are organized as novel extended Shields diagrams for non-spherical grains, where non-dimensional critical shear stress is represented in terms of friction Reynolds number.
Analytical and discrete solutions for the incipient motion of ellipsoidal sediment particles
This work introduces analytical and numerical approaches to compute the incipient motion of ellipsoidal sediment particles. Initiation of motion of spherical particles is dominated by rolling mode. However, solutions for initiation of motion for non-spherical grains have to incorporate rolling, sliding, and mixed modes. The proposed approaches include a wide variety of shapes and inclinations that represent realistic configurations of sediment bed layers. The numerical procedure is based on the discrete element method, simulating the micro-mechanics of the sediment as an aggregate of rigid ellipsoids interacting by contact. The numerical solution covers a range of incipient movements that cannot be covered by the analytical approach. Hence, some trapped modes observed in analytical calculations are complemented by the numerical computation of threshold stresses. The main results are organized as novel extended Shields diagrams for non-spherical grains, where non-dimensional critical shear stress is represented in terms of friction Reynolds number.
Analytical and discrete solutions for the incipient motion of ellipsoidal sediment particles
Bravo, Rafael (author) / Ortiz, Pablo (author) / Luis Pérez–Aparicio, José (author)
Journal of Hydraulic Research ; 56 ; 29-43
2018-01-02
15 pages
Article (Journal)
Electronic Resource
English
Criteria for Incipient Motion of Spherical Sediment Particles
| Online Contents | 1995
Criteria for Incipient Motion of Spherical Sediment Particles
| British Library Online Contents | 1995
Incipient Motion for Gravel Particles in Cohesionless Sediment Mixtures
| Springer Verlag | 2018
A Note on the Incipient Motion of Sediment Particles
| British Library Conference Proceedings | 1996
Incipient sediment motion with upward
| British Library Online Contents | 1999