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Studying effect of entrainment on dynamics of debris flows using numerical simulation

Nikooei, M ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.cageo.2019.104337
  3. Publisher: Elsevier Ltd , 2020
  4. Abstract:
  5. This paper studies entrainment phenomenon in debris flows using full flow (non-depth-averaged) equations and an Incompressible Smoothed Particle Hydrodynamics (ISPH) method. A viscoplastic constitutive relationship is adopted for both the overlying fluid and bed material. Collapse of a two-dimensional dry granular column on a horizontal bed consisting of entrainable dry granular material is considered as a benchmark problem. The adopted ISPH method for simulation of collapse over rigid and entrainable beds is validated using available numerical and experimental data. To quantify the effects of entrainment on dynamics of flow, the initial aspect ratio of granular column (a) is varied and the variations in momentum and energy of moving materials are investigated. © 2019 Elsevier Ltd
  6. Keywords:
  7. Entrainment ; Granular flows ; Smoothed particle hydrodynamics (SPH) ; Viscoplastic model ; Air entrainment ; Aspect ratio ; Debris ; Granular materials ; Numerical methods ; Bench-mark problems ; Constitutive relationships ; Debris flows ; Granular columns ; Smoothed particle hydrodynamics ; Viscoplastic models ; Hydrodynamics ; Computer simulation ; Debris flow ; Granular medium ; Hydrodynamics ; Smoothing ; Viscoplasticity
  8. Source: Computers and Geosciences ; Volume 134 , 2020
  9. URL: https://www.sciencedirect.com/science/article/pii/S0098300419302109