Modeling the Slump-Type Landslide Tsunamis Part II: Numerical Simulation of Tsunamis with Bingham Landslide Model

Vuong, Thi Hong Nhi; Wu, Tso-Ren; Wang, Chun Yu; Chu, Chia Ren

doi:10.3390/app10196872

Cited by 3 publications

(3 citation statements)

References 60 publications

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“…The turbulent effect is close to the Large Eddy Simulation (LES) model [17]. Detail description is presented in [18,19].…”

Section: Fluid Solvermentioning

confidence: 53%

“…This evidence about the distinct peak value and the abrupt decrease in shear stress promoted the development of the Discontinuous Bi-viscosity Model (DBM), which is indicated in detail in [19]. The DBM successfully predicted the mud flow and landslide tsunami in [18,19]. The DBM is written as:…”

Section: Rheological Modelmentioning

confidence: 99%

“…γ is the rheology viscosity of the cohesive material calculated by the rheological model. µ t is the viscosity of the sub-grid scale turbulence, of which a detailed calculation is presented in [18]. µ m is the molecular viscosity.…”

Section: Fluid Solvermentioning

confidence: 99%

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Numerical Analysis of Local Scour of the Offshore Wind Turbines in Taiwan

Vuong

Huang

et al. 2023

JMSE

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Rapid expansions of the offshore wind industry have stimulated a renewed interest in the behavior of offshore wind turbines. Monopile, tripod, and jack-up wind turbines support most offshore wind turbines. These foundations are sensitive to scour, reducing their ultimate capacity and altering their dynamic response. However, the existing approaches ignore the seabed’s rheological properties in the scour process. This study focuses on the scour development around the wind turbine foundation in the Changhua wind farm in Taiwan. The simulation results explain the influence of different hydrodynamic mechanisms on the local scours in a cohesive fluid, such as regular waves, random waves, and constant currents. A newly non-Newtonian fluid model, the Discontinuous Bi-viscous Model (DBM), reproduces closet mud material nature without many empirical coefficients and an empirical formula. This new rheology model is integrated and coupled into the Splash3D model, which resolves the Navier–Stokes equations with a PLIC-VOF surface-tracking algorithm. The deformation of the scour hole, the backfilling, and the maximum scour depth are exhibited around the wind turbines. Waves, including regular and irregular waves, do not increase the scour depth compared with currents only. In the case of random wave–current coupling, the results present a signal of scour evolution. However, the scour depth is shallow at 0.033≤S/D≤0.046.

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“…The turbulent effect is close to the Large Eddy Simulation (LES) model [17]. Detail description is presented in [18,19].…”

Section: Fluid Solvermentioning

confidence: 53%

Section: Rheological Modelmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Analysis of Local Scour of the Offshore Wind Turbines in Taiwan

Vuong

Huang

et al. 2023

JMSE

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Numerical simulation of submarine landslide tsunamis based on the smoothed particle hydrodynamics model

Li,

Chen,

Liu

et al. 2024

Physics of Fluids

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This paper establishes a SPH (Smoothed Particle Hydrodynamics) model for simulating underwater landslides based on the mixture theory. This model requires only one layer of particles, which greatly improves the computational efficiency compared with the traditional two-layer particle simulation for a mixture theory scheme. In the numerical model, based on a mixture theory, submerged landslide flow is regarded as a mixture of water and sediment phases and is discretized into a series of SPH mixed particles employing the volume fraction of the sediment phase. Using this volume fraction, a convection–diffusion term is calculated to represent the material transport between the water phase and the sediment phase. In addition, based on this volume fraction, the SPH mixed particles at any location in the considered domain are classified into three categories: (i) pure water, (ii) low-concentration suspended sediment, and (iii) high-concentration sediment. Pure water is treated as a Newtonian fluid. High-concentration sediment is modeled as a non-Newtonian fluid, and the Herschel–Bulkley–Papanastasiou rheological model is used to describe the viscous forces. The viscosity of the low-concentration suspended sediment, which acts as a transition layer between pure water and high-concentration sediment, is derived from the Chezy relation. A comparison of the numerical and experimental results demonstrates the high accuracy of the present numerical scheme. Using this validated numerical model, underwater landslides are simulated. Specifically, the effects of landslide deformation and compaction degree on the amplitudes of the surge wave crest and trough are investigated.

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Numerical Modeling of Generation of Landslide Tsunamis: A Review

Lee

Shi

et al. 2022

J. Earthquake and Tsunami

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Depth-integrated wave models are widely used for simulating large-scale propagation of landslide tsunamis, with the generation of tsunami being simulated separately by various generation models to provide the required initial conditions. For a given problem, the selection of a proper tsunami generation model is an important aspect for tsunami hazard analysis. The generation of tsunamis by submarine or subaerial landslides is a transient multiphase process which involves important fine-scale physics. Depth-integrated generation models, while relatively easy to use, cannot simulate these fine-scale physics. Depth-resolved generation models can overcome the shortcomings of depth-integrated generation models but are computationally demanding. This paper first reviews existing depth-integrated generation models to show the need for depth-resolved generation models. Four classes of depth-resolved generation models are reviewed: computational fluid dynamics (CFD) models, approaches coupling CFD and discrete element method, multiphase flow models, and meshless particle models. Multiphase flow models, which are relatively new, can consider complex interactions between landslide materials and its surrounding fluids. Meshless particle models are appealing for simulating landslide tsunamis because of their convenience to deal with the violent motion of the water surface and ability to run on graphics processing units. The main strengths, weaknesses, and future research directions of the reviewed models are briefly discussed. The literature reviewed, which is by no means complete, aims to provide researchers updated and practical guidelines on numerical modeling techniques for simulating the generation process of landslide tsunamis.

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Modeling the Slump-Type Landslide Tsunamis Part II: Numerical Simulation of Tsunamis with Bingham Landslide Model

Cited by 3 publications

References 60 publications

Numerical Analysis of Local Scour of the Offshore Wind Turbines in Taiwan

Numerical Analysis of Local Scour of the Offshore Wind Turbines in Taiwan

Numerical simulation of submarine landslide tsunamis based on the smoothed particle hydrodynamics model

Numerical Modeling of Generation of Landslide Tsunamis: A Review

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