Zobrazeno 1 - 10
of 87
pro vyhledávání: '"D'Ortona, Umberto"'
Publikováno v:
Physical Review Research, 2024, 6 (3), pp.L032038
The origin of large and small particle axial bands in long rotating tumblers is a long-standing question. Using DEM simulations, we show that this axial segregation is due to a Rayleigh-Taylor instability which is characterized by the fact that the d
Externí odkaz:
http://arxiv.org/abs/2410.11361
Publikováno v:
Journal of Fluid Mechanics, 2024, 994, pp.A8
The yield stress and shear thinning properties of mucus are identified as critical for ciliary coordination and mucus transport in human airways. We use here numerical simulations to explore the hydrodynamic coupling of cilia and mucus with these two
Externí odkaz:
http://arxiv.org/abs/2410.11337
Friction at the endwalls of partially-filled horizontal rotating tumblers induces curvature and axial drift of particle trajectories in the surface flowing layer. Here we describe the results of a detailed discrete element method study of the dry gra
Externí odkaz:
http://arxiv.org/abs/2111.08983
Autor:
d'Ortona, Umberto, Thomas, Nathalie
Publikováno v:
Phys. Rev. Lett. 124, 178001 (2020)
Dry granular material flowing on rough inclines can experience a self-induced Rayleigh-Taylor (RT) instability followed by the spontaneous emergence of convection cells. For this to happen, particles are different in size and density, the larger part
Externí odkaz:
http://arxiv.org/abs/2003.06237
The present work reports the formation and the characterization of antipleptic and symplectic metachronal waves in 3D cilia arrays immersed in a two-fluid environment, with a viscosity ratio of 20. A coupled lattice-Boltzmann-Immersed-Boundary solver
Externí odkaz:
http://arxiv.org/abs/1703.08313
Akademický článek
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Autor:
Thomas, Nathalie, D'ortona, Umberto
Publikováno v:
Phys. Rev. E 97, 022903 (2018)
In a dry granular flow, size segregation behave differently for a mixture containing a few large beads with a size ratio (S) above 5 (Thomas, Phys.Rev.E 62,96(2000)). For moderate large S, large beads migrate to an intermediate depth in the bed: this
Externí odkaz:
http://arxiv.org/abs/1612.05415
Publikováno v:
In Journal of Computational Physics 15 March 2021 429
Size bidisperse granular materials in a spherical tumbler segregate into two different patterns of three bands with either small particles at the equator and large particles at the poles or vice versa, depending upon the fill level in the tumbler. He
Externí odkaz:
http://arxiv.org/abs/1511.09255
Walls in discrete element method simulations of granular flows are sometimes modeled as a closely packed monolayer of fixed particles, resulting in a rough wall rather than a geometrically smooth wall. An implicit assumption is that the resulting rou
Externí odkaz:
http://arxiv.org/abs/1507.07347