Abstract
We use the non-Cartesian, topography-based equations of mass and momentum balance for gravity driven frictional flows of Luca et al. (Math. Mod. Meth. Appl. Sci. 19, 127–171 (2009)) to motivate a study on various approximations of avalanche models for single-phase granular materials. By introducing scaling approximations we develop a hierarchy of model equations which differ by degrees in shallowness, basal curvature, peculiarity of constitutive formulation (non-Newtonian viscous fluids, Savage–Hutter model) and velocity profile parametrization. An interesting result is that differences due to the constitutive behaviour are largely eliminated by scaling approximations. Emphasis is on avalanche flows; however, most equations presented here can be used in the dynamics of other thin films on arbitrary surfaces.
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I. Luca is on leave from Department of Mathematics II, University Politehnica of Bucharest, Splaiul Independentei 313, 79590 Bucharest, Romania, E-mail: iolucaro@yahoo.com.
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Luca, I., Hutter, K., Tai, Y.C. et al. A hierarchy of avalanche models on arbitrary topography. Acta Mech 205, 121–149 (2009). https://doi.org/10.1007/s00707-009-0165-4
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DOI: https://doi.org/10.1007/s00707-009-0165-4