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A two-phase two-layer model for fluidized granular flows with dilatancy effects

Opened Access A two-phase two-layer model for fluidized granular flows with dilatancy effects

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Autor: Bouchut, François
Fernández-Nieto, Enrique D.
Mangeney, Anne
Narbona-Reina, Gladys
Departamento: Universidad de Sevilla. Departamento de Matemática Aplicada I (ETSII)
Fecha: 2016
Publicado en: Journal of Fluid Mechanics, 801, 166-221.
Tipo de documento: Artículo
Resumen: We propose a two-phase two-thin-layer model for fluidized debris flows that takes into account dilatancy effects, based on the closure relation proposed by Roux & Radjai (Physics of Dry Granular Media, 1998, Springer, pp. 229–236). This relation implies that the occurrence of dilation or contraction of the granular material depends on whether the solid volume fraction is respectively higher or lower than a critical value. When dilation occurs, the fluid is sucked into the granular material, the pore pressure decreases and the friction force on the granular phase increases. On the contrary, in the case of contraction, the fluid is expelled from the mixture, the pore pressure increases and the friction force diminishes. To account for this transfer of fluid into and out of the mixture, a two-layer model is proposed with a fluid layer on top of the two-phase mixture layer. Mass and momentum conservation are satisfied for the two phases, and mass and momentum are transferred between the t...
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Cita: Bouchut, F., Fernández-Nieto, E.D., Mangeney, A. y Narbona-Reina, G. (2016). A two-phase two-layer model for fluidized granular flows with dilatancy effects. Journal of Fluid Mechanics, 801, 166-221.
Tamaño: 1006.Kb
Formato: PDF

URI: http://hdl.handle.net/11441/50741

DOI: 10.1017/jfm.2016.417

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