Numerical investigations for mitigation of tsunami wave impact on onshore buildings using sea dikes

Prabu, P.; Bhallamudi, S. Murty; Chaudhuri, Abhijit; Sannasiraj, S. A.

doi:10.1016/j.oceaneng.2019.106159

Cited by 15 publications

(8 citation statements)

References 29 publications

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“…As observed, the impulsive force did not follow any specific trend in variation with α. The possible reason could be described in terms of turbulent aeration mix during the overtopping surge interaction with the inland structure [36], overtopping volume and the corresponding overtopped momentum flux [43,44]. In addition, as explained in our study, the LRC induces flow circulation at the structure front, inducing a significant disturbance in the overtopping surge.…”

mentioning

confidence: 61%

“…Hence, the numerical simulations were carried out with seven different heights for the LRC and the VW, which are more common along different coasts worldwide. We also varied the distance (L) between the structure and the mitigation wall to understand the effect of L since earlier literature reported that L also influences the forces on the inland structure [31,33,37,43]. The overall height of the VW and the LRC was kept the same to understand the potential influence of the recurve.…”

Section: Parametric Studymentioning

confidence: 99%

“…The distance between the mitigation wall and the landward structure plays a significant role in the force acting on the structure [31,37,43]. The effect of L can be discussed in terms of L/Frbhb, where the surge Froude number, 𝐹𝑟 = , is defined using surge front celerity (C) and the surge depth (hb).…”

Section: Effect Of Lmentioning

confidence: 99%

“…Thus, the pressure distribution also depends on the Fr of the overtopping surge [42]. Prabu et al [43] attempted to understand the influence of the sea dike height on the force reduction and the effective L for maximum force reduction. The study concluded that depending on the strength of the surge, the effective L for maximum force reduction changes.…”

Section: Introductionmentioning

confidence: 99%

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Tsunami-like Flow-Induced Forces on the Landward Structure behind a Vertical Seawall with and without Recurve Using OpenFOAM

Harish

Sriram

Schüttrumpf

et al. 2022

Water

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It is more common to introduce the parapet/recurve/wave return wall over the existing structure, such as a vertical seawall or composite structure, to reduce the overtopping efficiently. The advantage of a recurve wall on top of the sea wall has been studied in the past in regards to wave interaction and overtopping. However, their efficiency in protecting the inland structure during extreme events such as flooding during a tsunami is unexplored. The present study addresses the effect of a vertical seawall with recurve in reducing the dam break surge simulating tsunami-induced forces on an inland structure. The study compares the momentum transferred on the landward structure behind a Vertical seaWall (VW) and a vertical wall with the Large ReCurve on the top (LRC) during overtopped conditions. The outcome from the numerical simulation shows an insignificant contribution due to the LRC in reducing the force on the inland structure compared to the VW, albeit delaying the impact time. However, the LRC performed slightly better in the case of a low-rise wall located near the inland structure than the VW. Furthermore, a low-rise VW increases the force and overturning moment on the inland structure compared to no-wall conditions. Both the LRC and the VW reduced the horizontal force on the structure linearly with the increase in height. An exponential decrease in the overturning moment was observed on the landward structure with the increase in the height of the VW or the LRC. Design equations are proposed for the forces and overturning moment reduction based on the height of the VW or the LRC.

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confidence: 61%

Section: Parametric Studymentioning

confidence: 99%

Section: Effect Of Lmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tsunami-like Flow-Induced Forces on the Landward Structure behind a Vertical Seawall with and without Recurve Using OpenFOAM

Harish

Sriram

Schüttrumpf

et al. 2022

Water

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“…Findings from these investigations suggest that the application of Stokes wave theory remains viable within the shallow regime, and the Explicit formulation is particularly sensitive to breaking conditions, necessitating a very small step size. Additional research has undertaken numerical simulations of the propagation, impinging, and overtopping of solitary waves on sloped beaches [22,23]. A comparative study by De Chowdhury et al [24] between two numerical models, the Smoothed Particle Hydrodynamics and ANSYS Fluent software, noted a comparable level of performance between these models.…”

Section: Introductionmentioning

confidence: 99%

Impact of Stepped Structures on Tsunami Wave Propagation and Overtopping Engineering

Chergui,

Bouzit

2023

IJSSE

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The urgent necessity to fortify coastal regions and safeguard both the natural environment and key coastal infrastructure underscores the significance of structural measures in coastal engineering. Among these, the seawall reigns as the primary fortification method. This study aims to elucidate the impact of a stepped structure on the propagation and overtopping of solitary waves when they encounter an impermeable seawall. The investigation has been conducted using ANSYS Fluent, a widely recognized commercial software. Although previous researchers have extensively used the two-dimensional volume of fluid (VOF) model, based on the Reynolds-Averaged Navier-Stokes (RANS) equations and the k-ε turbulence closure solver, this study fills the gap in the understanding of the stepped structure's effect. It shows a commendable agreement with experimental results, proving its reliability. Simulations were executed with varied configurations of stepped structures (Step width Sw=0.6 m, 1.2 m, 1.8 m, and Step height Sh=0.3 m, 0.6 m, 0.9 m), emulating tsunami waves of constant wave height and water depth over a stepped structure on a 1:20 sloped beach. Initially, the accuracy of the results was substantiated by comparing them with experimental and numerical data of the free surface and the distribution of the pressure field on the seawall. Numerical simulations, incorporating varying wave heights, water depths, and step heights, were performed to scrutinize the evolution of waves and the pressure exerted by waves impacting the seawall.

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Evaluating the advantage of turbulent flow to diminish concentration polarization in Roto-dynamic RO system

Prakash,

Chaudhuri,

Das

2024

Chemical Engineering and Processing - Process Intensification

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Numerical investigations for mitigation of tsunami wave impact on onshore buildings using sea dikes

Cited by 15 publications

References 29 publications

Tsunami-like Flow-Induced Forces on the Landward Structure behind a Vertical Seawall with and without Recurve Using OpenFOAM

Tsunami-like Flow-Induced Forces on the Landward Structure behind a Vertical Seawall with and without Recurve Using OpenFOAM

Impact of Stepped Structures on Tsunami Wave Propagation and Overtopping Engineering

Evaluating the advantage of turbulent flow to diminish concentration polarization in Roto-dynamic RO system

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