Zobrazeno 1 - 10 of 98 pro vyhledávání: '"Alexandre Valance"'
1
Granular surface flows confined between flat, frictional walls. Part 1. Kinematics
Autor: Patrick Richard, Alexandre Valance, Renaud Delannay, Philippe Boltenhagen
Publikováno v: Journal of Fluid Mechanics
Journal of Fluid Mechanics, 2022, 940, pp.A30. ⟨10.1017/jfm.2022.245⟩
We report and analyse the results of extensive discrete element method simulations of three-dimensional gravity driven flows of cohesionless granular media over an erodible bed, the whole being confined between two flat and frictional sidewalls. We f
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eee91ec6cc34e52730e6327368fae8bd
https://doi.org/10.1017/jfm.2022.245
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2
Particle segregation in inclined high-speed granular flows
Autor: Aurélien Neveu, Michele Larcher, Renaud Delannay, James T. Jenkins, Alexandre Valance
Publikováno v: Journal of Fluid Mechanics
Journal of Fluid Mechanics, 2022, 935, pp.-A41. ⟨10.1017/jfm.2022.51⟩
International audience; We report on the discovery, using numerical simulations, of a segregation pattern in high-speed granular flows, in which size segregation is primarily driven by two-dimensional granular temperature gradients, rather than by gr
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::25b00adcc0063d1dacf594b177f1a923
https://doi.org/10.1017/jfm.2022.51
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3
Particle saltation over rigid bumpy beds in viscous shearing flows
Autor: Alexandre Valance, Diego Berzi
Publikováno v: Journal of Fluid Mechanics
Journal of Fluid Mechanics, 2022, 947, ⟨10.1017/jfm.2022.616⟩
International audience; We investigate the steady motion of solid particles through successive jumps over a horizontal, rigid, bumpy bed driven by the shearing of a viscous fluid in the absence of turbulence, lubrication forces and collisions above t
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a7a7bb988fb9b105c059347e772cf4f9
http://hdl.handle.net/11311/1220896
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4
Experimental assessment of the effective friction at the base of granular chute flows on a smooth incline
Autor: Lucas Corna, Thierry Latchimy, Anne Mangeney, Siet van den Wildenberg, Renaud Delannay, Olivier Roche, Alexandre Valance
Publikováno v: Physical Review E
Physical Review E, 2021, 103 (4), pp.042905. ⟨10.1103/PhysRevE.103.042905⟩
Physical Review E, American Physical Society (APS), 2021, 103 (4), pp.042905. ⟨10.1103/PhysRevE.103.042905⟩
We report on direct measurements of the basal force components for granular material flowing down a smooth incline. We investigate granular flows for a large range of inclination angles from teta=13.4{\deg} to 83.6{\deg} and various gate opening of t
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::df03da12f1b1041bcf0f8f307bb0c803
https://doi.org/10.1103/physreve.103.042905
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5
Influence of cohesion on drifting snow investigated in cold wind-tunnel
Autor: Kenji Kosugi, Ahmed Ould El Moctar, Florence Naaim, Masaki Nemoto, Pascal Dupont, Alexandre Valance, Jean-luc Velotiana Ralaiarisoa, Yoichi Ito
Aeolian transport of particles occurs in many geophysical contexts such as wind-blown sand or snow drift and is governed by a myriad of physical mechanisms. Most of drifting particles are transported within a saltation layer and has been largely stud
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ad5d231ba142c2fd14d9d046c0c311d4
https://doi.org/10.5194/egusphere-egu21-16560
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6
Sidewall friction in confined surface flows of granular materials
Autor: Renaud Delannay, Patrick Richard, Alexandre Valance
Publikováno v: EPJ Web of Conferences
EPJ Web of Conferences, 2021, 249, pp.03024. ⟨10.1051/epjconf/202124903024⟩
EPJ Web of Conferences, EDP Sciences, 2021, 249, pp.03024. ⟨10.1051/epjconf/202124903024⟩
EPJ Web of Conferences, Vol 249, p 03024 (2021)
International audience; We report numerical simulations of surface granular flows confined between two sidewalls. These systems exhibit both very slow and very energetic flows. Zhu et al. [1] have shown that in energetic confined systems, the Froude
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fcb9253f55426da9531e002d3fc6d92c
https://hal.science/hal-03451140/file/Richard_PandG.pdf
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7
Aerodynamic and impact thresholds for cohesive mixture of sand and non-volatile liquid
Autor: Alexandre Valance, Ahmed Ould El Moctar, Jean-Baptiste Besnard, Pascal Dupont
Publikováno v: EPJ Web of Conferences, Vol 249, p 08007 (2021)
EPJ Web of Conferences
EPJ Web of Conferences, EDP Sciences, 2021, 249, pp.08007. ⟨10.1051/epjconf/202124908007⟩
EPJ Web of Conferences, 2021, 249, pp.08007. ⟨10.1051/epjconf/202124908007⟩
International audience; The moisture has been recognized to have a significant influence on the initiation movement of sand by wind and consequently on sand transport rates. The pertinent literature regarding these phenomena is sparse and current ava
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aeddaadce55f46f0b86db521e2c1d952
https://www.epj-conferences.org/articles/epjconf/pdf/2021/03/epjconf_pg2021_08007.pdf
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9
High-speed confined granular flows down smooth inclines: scaling and wall friction laws
Autor: Renaud Delannay, Yajuan Zhu, Alexandre Valance
Publikováno v: Granular Matter
Granular Matter, Springer Verlag, 2020, 22 (4), pp.82. ⟨10.1007/s10035-020-01053-7⟩
Granular Matter, 2020, 22 (4), pp.82. ⟨10.1007/s10035-020-01053-7⟩
Recent numerical work has shown that high-speed confined granular flows down smooth inclines exhibit a rich variety of flow patterns, including dense unidirectional flows, flows with longitudinal vortices and supported flows characterized by a dense
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::73e5c2813ba1f54de6ee8f9eacf5b642
https://hal.archives-ouvertes.fr/hal-02960214
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10
Influence of lateral confinement on granular flows: comparison between shear-driven and gravity-driven flows
Autor: Patrick Richard, Riccardo Artoni, Renaud Delannay, Alexandre Valance
Publikováno v: Granular Matter
Granular Matter, Springer Verlag, 2020, 22 (4), ⟨10.1007/s10035-020-01057-3⟩
Granular Matter, 2020, 22 (4), ⟨10.1007/s10035-020-01057-3⟩
International audience; The properties of confined granular flows are studied through discrete numerical simulations. Two types of flows with different boundaries are compared: (i) gravity-driven flows topped with a free surface and over a base where
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::62e1fd0cb8d4d1801a7f5401248897bc
https://doi.org/10.1007/s10035-020-01057-3
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