000135180 001__ 135180
000135180 005__ 20240516095249.0
000135180 0247_ $$2doi$$a10.1016/j.advwatres.2024.104710
000135180 0248_ $$2sideral$$a138511
000135180 037__ $$aART-2024-138511
000135180 041__ $$aeng
000135180 100__ $$0(orcid)0000-0003-4673-9073$$aMartínez-Aranda, S.$$uUniversidad de Zaragoza
000135180 245__ $$aMixing-phase model for shear-induced contractive/dilative effects in unsteady water-sediment mixture flows
000135180 260__ $$c2024
000135180 5060_ $$aAccess copy available to the general public$$fUnrestricted
000135180 5203_ $$aAmong the geophysical surface processes, mud and debris flows show one of the most complex and challenging behaviour for scientists and modellers. These flows consist of highly-unsteady gravity-driven movements of water-sediment mixtures with non-Newtonian rheology where the solid concentration could be about 40%–80% of the flow volume and which occur along steep and irregular terrains. Furthermore, the appearance of dynamic pressures in the fluid filling the intergranular pores increases the complexity and dominates the behaviour of the fluidized water-sediment material, leading to the appearance of significant density gradients during the movement. The dynamic pressure in the pore-fluid changes the effective normal stress within the mobilized material, affecting the frictional shear stress between grains and leading to the solid phase dilation/contraction. This must be properly accounted for when developing realistic models for water-sediment surface flows. In this work, a novel physically-based approach for modelling multi-grain dense-packed water-sediment flows is presented. A novel closure formulation for the pressure distribution within the pore-fluid during the movement of dense-packed water-sediment materials has been derived. This closure allows to relate the appearance of shear-induced dynamic pore pressures to the contractive/dilative behaviour of the solid aggregate. The resultant system of depth-averaged conservation laws includes continuity of the density-variable water-sediment material and the different solid classes transported in the flow, as well as the linear momentum equation for the fluidized bulk material, and it is solved using a well-balanced fully-coupled Finite Volume (FV) method. The resultant simulation tool is faced to synthetic, laboratory and real-scale benchmark cases to test its robustness and accuracy. The presence of dynamic pore pressures within the pore-fluid leads to the appearance of a deviatoric contribution to the solid flux, which causes the shear-induced separation of the solid and liquid phases and sustains the flow mobility for long distances, as it has been observed in real mud and debris events.
000135180 536__ $$9info:eu-repo/grantAgreement/ES/MICINN/PID2022-137334NB-I00
000135180 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc$$uhttp://creativecommons.org/licenses/by-nc/3.0/es/
000135180 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000135180 700__ $$0(orcid)0000-0002-3635-6223$$aFernández-Pato, J.
000135180 700__ $$0(orcid)0000-0001-8674-1042$$aGarcía-Navarro, P.$$uUniversidad de Zaragoza
000135180 7102_ $$15001$$2600$$aUniversidad de Zaragoza$$bDpto. Ciencia Tecnol.Mater.Fl.$$cÁrea Mecánica de Fluidos
000135180 773__ $$g188 (2024), 104710 [21 pp.]$$pAdv. water resour.$$tAdvances in Water Resources$$x0309-1708
000135180 8564_ $$s6989230$$uhttps://zaguan.unizar.es/record/135180/files/texto_completo.pdf$$yVersión publicada
000135180 8564_ $$s2686584$$uhttps://zaguan.unizar.es/record/135180/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000135180 909CO $$ooai:zaguan.unizar.es:135180$$particulos$$pdriver
000135180 951__ $$a2024-05-16-08:53:47
000135180 980__ $$aARTICLE