Impulse wave generation: a comparison of landslides of block and granular masses by coupled Lagrangian tracking using VOF over a set mesh

This paper presents the numerical results of impulsive waves generated by landslides of solid block, granular materials and heavy block sinking. An impulse product parameter P is developed and a wide range of effective parameters are studied. The volume-of-fluid (VOF) and overset mesh methods have b...

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Bibliographic Details
Published in:Water science & technology. Water supply 2022-01, Vol.22 (1), p.510-526
Main Authors: Mokhtarzadeh, Ghasem, Basirat, Shamsa, Bazargan, Jalal, Delavari, Ehsan
Format: Article
Language:English
Subjects:
dam reservoirs
Earthquakes
Finite element method
Granular materials
landslide wave
Landslides
Landslides & mudslides
Numerical analysis
openfoam
overset mesh
Parameters
Propagation
Reservoirs
scott russell wave
Tracking
Tsunamis
Turbulence models
Water depth
Water reservoirs
Water waves
Wave generation
Wave height
Wave propagation
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Summary:This paper presents the numerical results of impulsive waves generated by landslides of solid block, granular materials and heavy block sinking. An impulse product parameter P is developed and a wide range of effective parameters are studied. The volume-of-fluid (VOF) and overset mesh methods have been used to study landslide-generated tsunamis. Also, a Lagrangian tracking approach coupled with the VOF to simulate the granular movement was developed. The effect of the water reservoir depth, the landslide height, the landslide density and the geometrical parameters on the wave height (elevation) has been investigated using the open-source OpenFOAM software. The results have been presented for dimensionless distances and the normalized geometry of the landslide in the ranges 5–7, and 1–2, respectively. These numbers have been normalized to the height of the landslide (a). According to the results of simulations, the tsunami formation process is divided into three stages, which were analyzed in detail by considering the interactions between the solid and the water reservoir. The Scott Russell wave has the highest impulse product parameter among the impulse wave mechanisms which is 58.6% of the total impulse production. In addition, the duration of the wave propagation has been computed based on the wave height.
ISSN:1606-9749
1607-0798
DOI:10.2166/ws.2021.254