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

Author:

Mokhtarzadeh Ghasem1,Basirat Shamsa1,Bazargan Jalal2,Delavari Ehsan1

Affiliation:

1. Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Isfahan 81346, Iran

2. Departments of Civil Engineering, Zanjan University, Zanjan 4513956111, Iran

Abstract

Abstract 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.

Publisher

IWA Publishing

Subject

Water Science and Technology

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