A two‐phase SPH model for debris flow propagation

Summary This paper presents a model which can be used for fast landslides where coupling between solid and pore fluid plays a fundamental role. The proposed model is able to describe debris flows where the difference of velocities between solid grains and fluid is important. The approach is based on...

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Bibliographic Details
Published in:International journal for numerical and analytical methods in geomechanics 2018-02, Vol.42 (3), p.418-448
Main Authors: Pastor, M., Yague, A., Stickle, M.M., Manzanal, D., Mira, P.
Format: Article
Language:English
Subjects:
Computational fluid dynamics
Computer simulation
Dam failure
Damping
Debris flow
Detritus
Fluid flow
Hydrodynamics
landslide propagation
Landslides
Landslides & mudslides
Mathematical analysis
mathematical model
Mathematical models
Phases
Rarefaction
Smooth particle hydrodynamics
Soil
Soil water
SPH
Waves
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Summary:Summary This paper presents a model which can be used for fast landslides where coupling between solid and pore fluid plays a fundamental role. The proposed model is able to describe debris flows where the difference of velocities between solid grains and fluid is important. The approach is based on the mathematical model proposed by Zienkiewicz and Shiomi, which is similar to those of Pitman and Le and Pudasaini. The novelty of the present work is the numerical technique used, the smoothed particle hydrodynamics (SPH). We propose to use a double set of nodes for soil and water phases, the interaction between them being described by a suitable drag law. The paper presents both mathematical and numerical models, describing the main assumptions and their limitations. Then, the model is applied to (1) a simple case where shocks and expansion waves appear, (2) a dam break problem on a horizontal plane with a frictional soil phase, and (3) a debris flow which happened in Hong Kong. The main conclusions that can be drawn from the applications are: Debris flows having 2 phases with important relative mobility present a rich structure of shocks and rarefaction waves, which has to be properly modeled. Otherwise, the model will have numerical damping or dispersion. Dambreak exercises provide interesting information in simple and controlled situations. We can see how both phases move relative to each other. Real debris flows can be simulated with the proposed model, obtaining reasonable results.
ISSN:0363-9061
1096-9853
DOI:10.1002/nag.2748