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The numerical modeling of non-Newtonian fluids (such as mining tailings, snow avalanches, etc.) requires the consideration of specific rheological models to calculate shear stress. The Voellmy friction model is one of the most popular theories, especially in snow avalanche modeling. Recently, Bartelt proposed a cohesion model to account for this intrinsic physical property in some fluids. However, the physical interpretation of the range of values for the Voellmy-Bartelt friction-cohesion model has not been sufficiently investigated, and this work aims to fill this gap. The results show that the Voellmy model dominates avalanche dynamics, and the cohesion model allows for the representation of long tails, while the friction and cohesion parameters can vary over a wide range. Additionally, a definition for the turbulent friction coefficient is proposed based on CORINE land use maps and the Manning coefficient for flood mapping.

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The numerical modeling of non-Newtonian fluids (such as mining tailings, snow avalanches, etc.) requires the consideration of specific rheological models to calculate shear stress. The Voellmy friction model is one of the most popular theories, especially in snow avalanche modeling. Recently, Bartelt proposed a cohesion model to account for this intrinsic physical property in some fluids. However, the physical interpretation of the range of values for the Voellmy-Bartelt friction-cohesion model has not been sufficiently investigated, and this work aims to fill this gap. The results show that the Voellmy model dominates avalanche dynamics, and the cohesion model allows for the representation of long tails, while the friction and cohesion parameters can vary over a wide range. Additionally, a definition for the turbulent friction coefficient is proposed based on CORINE land use maps and the Manning coefficient for flood mapping.
fluidos no Newtonianos, modelización numérica bidimensional, modelos reológicos, avalanchas de nieve,
non-Newtonian fluids, two-dimensional numerical modelling, rheological models, snow avalanches
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