A numerical and experimental investigation of wave generated by submerged landslides

Li, Hao Jia; Jin, Yee‐Chung; Tai, Yih-Chin

doi:10.1016/j.oceaneng.2020.108203

Cited by 9 publications

(8 citation statements)

References 36 publications

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“…where i and j denote the indexes of particles, r ij is the distance between particle i and particle j, r e is the search radius, and d is the initial particle distance to discretize the fluid and boundaries. In previous studies, 3,42,43 the search radius is set in the range of 2.1d-3.5d. Using r e = 4.0d can ensure the accuracy by using the Laplacian model 44 to discretize the PPE and the viscous term.…”

Section: Spatial Operatorsmentioning

confidence: 99%

“…In previous studies by using the collision model, 44,46,47 the collision distance is defined as d coll = (0.80-0.95) d, and thus d coll = 0.9 d is selected in this study. This value is also used to simulate the wave generated by submerged landslides by Li et al 43 Conceptually, the smaller distance for the two approaching particles, the larger collision force is expected, and vice versa. Hence, in the equation, a coefficient ij = (d coll − r ij )/d coll is introduced to account for this issue.…”

Section: Collision Modelmentioning

confidence: 99%

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Explicit calculation for the pressure Poisson equation to simulate incompressible fluid flows in a mesh‐free method

2021

Numerical Methods in Fluids

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In this study, an equation is derived to explicitly solve the pressure Poisson equation (PPE) in the moving particle semiimplicit method. In the derivation, the PPE is discretized by an improved Laplacian model and the incompressible condition is satisfied by establishing a direct relationship between pressure and the known flow information. An improved gradient model is adopted in the method while a repulsive force is used to handle particle clustering. To validate the method, a hydrostatic problem, the impact of two rectangular fluid patches and dam-breaking flows are simulated. The numerical results are compared with analytical solutions and experimental measurements in terms of free surface, pressure, and velocity. Good agreements in the comparisons are achieved, showing that the method can calculate smooth pressure field and accurate pressure and velocity distributions. K E Y W O R D Sdam-break flow, explicit method, free surface, mesh-free method, pressure field INTRODUCTIONThe mesh-free method is advantageous in handling interface flows, 1,2 such as free surface flows and two-phase flows.To simulate incompressible fluid flows, one significant branch for the mesh-free method is to solve the pressure Poisson equation (PPE) as the projection-based particle method. There are several types of this method with wide application in simulating free-surface flows referred as the moving particle semiimplicit method (MPS) 3-6 and the incompressible smoothed particle hydrodynamics (ISPH). [7][8][9] The MPS method was initially introduced to model complex thermal-hydraulic problems by using particles. The method includes the particle interaction models representing pressure gradient, diffusion, incompressibility, and a free surface boundary condition, in which the particle interaction is localized by using a kernel function. In the method, an implicit pressure calculation procedure is used to model the incompressible fluid flows. 10 Koshizuka et al. 3 used the MPS method to simulate two types of breaking waves on slopes as the plunging and spilling breakers. They obtained the critical value to separate the two breaker types and calculated the repeated process for a float of moving offshore and inshore. Koshizuka 5 reviewed the numerical developments of the MPS method in the calculation of the thermal-hydraulic problems in terms of fluid dynamics and heat transfer. Gotoh 11 presented a pioneering work of the large eddy simulation-based turbulence modeling in the context of particle methods by developing the so-called subparticle scale turbulence model. The model has been applied to both MPS and smoothed particle hydrodynamics (SPH) to capture the turbulence. 12,13 The MPS method is also modified by many researchers to enhance its performance in different research areas. Khayyer and Gotoh 14 proposed a corrected MPS method to track water surface in breaking waves, in which the pressure 3034

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Section: Spatial Operatorsmentioning

confidence: 99%

Section: Collision Modelmentioning

confidence: 99%

Explicit calculation for the pressure Poisson equation to simulate incompressible fluid flows in a mesh‐free method

2021

Numerical Methods in Fluids

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“…A computation case was constructed in this section by referring to the model experiment introduced by Li et al (2020) to validate the numerical wave tank and the wave-making method and calibrate the precision of the grid configuration. The layout of the numerical wave tank used in this case is shown in Fig.…”

Section: Model Validationmentioning

confidence: 99%

“…The aforementioned experiments do not incorporate detailed fluid-field distribution information. To make up for this insufficiency, Li et al (2020) applied the particle image velocimetry (PIV) technique in their submarine landslide-induced tsunami model tests, but only the velocity distribution information can be obtained. Generally, physical model experiments have high costs in terms of manpower and materials and limitations for obtaining flow field data and are easily be influenced by the scale effect, but can provide sufficient data for testing and validating the numerical simulation methods.…”

Section: Introductionmentioning

confidence: 99%

“…Ataie-Ashtiani and Shobeyri ( 2008) established a numerical model by using the implicit incompressible SPH (ISPH) method to investigate the tsunamis generated by rigid and deformable sliding bodies. Li et al (2020) applied the weakly compressible MPS (WC-MPS) method to investigate the wave propagation and flow field under a submarine landslide. Although mesh-free methods are popular in studying tsunamis due to their advantages in capturing big deformations of free water surfaces in recent years, these methods are computationally expensive in simulating real-scale models (Yavari-Ramshe and Ataie-Ashtiani 2016) and are unstable in solving the stress tensor (Ganzenmüller et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of the hydrodynamic response of an impermeable sea-wall subjected to artificial submarine landslide-induced tsunamis

Deng

Cao

et al. 2021

Landslides

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Landslide-induced tsunamis are common natural hazards that potentially affect the safety and stability of waterfront structures. A numerical tank was constructed using FLOW-3D to investigate the hydrodynamic response of the sea-wall subjected to artificial submarine landslide-induced tsunamis, including the hydrodynamic load and wave run-up height. Initially, the landslideinduced tsunami model was calibrated using experiments to ensure high accuracy for capturing the free surface and obtaining the flow field information. Then, the sea-wall was added into the numerical tank to study the hydrodynamic response of the sea-wall. The results show that the artificial landslide successively generated two wave crests and that the hydrodynamic response of the seawall under the second crest was stronger than that under the first crest. Additionally, the effects of different influencing factors on the hydrodynamic response were discussed, respectively, and prediction equations for the hydrodynamic response considering these factors were proposed.

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Application of a Moving Particle Semi-Implicit Numerical Wave Flume (MPS-NWF) to model design waves

Renzi

Dias

2022

Coastal Engineering

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A numerical and experimental investigation of wave generated by submerged landslides

Cited by 9 publications

References 36 publications

Explicit calculation for the pressure Poisson equation to simulate incompressible fluid flows in a mesh‐free method

Explicit calculation for the pressure Poisson equation to simulate incompressible fluid flows in a mesh‐free method

Numerical investigation of the hydrodynamic response of an impermeable sea-wall subjected to artificial submarine landslide-induced tsunamis

Application of a Moving Particle Semi-Implicit Numerical Wave Flume (MPS-NWF) to model design waves

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