Chute flows of dry granular media: Numerical simulations by a well-posed multilayer model and comparisons with experiments

Luca Sarno, Yongqi Wang, Yih Chin Tai, Maria Nicolina Papa, Paolo Villani

Research output: Contribution to journalConference articlepeer-review

Abstract

Debris flows and avalanches are dangerous natural phenomena, characterized by the gravity-driven motion of granular media immersed in a fluid. For an appropriate hazard assessment or disaster mitigation by scenario investigation, it is crucial to capture the underlying dynamics of the granular solid phase. For this purpose, a multilayer depth-averaged approach represents a promising and computationally efficient tool over fully three-dimensional models. Here we use a mathematically well-posed multilayer model, which implements the μ(I)-rheology and a dilatancy law depending on the inertial number, I, and compare the numerical results of the model with laboratory experiments of steady uniform chute flows over an erodible bed. The well-posedness of the model for any value of I, which is essential to get convergent numerical solutions, is achieved by considering an approximation of the in-plane stress gradients, directly emerging from the μ(I)-rheology. The predicted velocity profiles show a very good agreement with the experimental ones, measured by particle image velocimetry (PIV). The volume fraction profiles by the multilayer model are also in good qualitative agreement with those measured by using the stochastic-optical method (SOM), while they tend to overestimate the volume fraction measurements in the more dilute upper region, closer to the free surface.

Original languageEnglish
Article number02018
JournalE3S Web of Conferences
Volume415
DOIs
Publication statusPublished - 2023 Aug 18
Event8th International Conference on Debris Flow Hazard Mitigation, DFHM 2023 - Torino, Italy
Duration: 2023 Jun 262023 Jun 29

All Science Journal Classification (ASJC) codes

  • General Environmental Science
  • General Energy
  • General Earth and Planetary Sciences

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