SPH-LES Model for Numerical Investigation of Wave Interaction with Partially Immersed Breakwater

Gotoh, Hitoshi; Shao, Songdong; Memita, Tetsu

doi:10.1142/s0578563404000872

Cited by 146 publications

(61 citation statements)

References 15 publications

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“…Back in 2004, Gotho et al [30] [32] simulated tsunami runup on idealized geometries for the validation and exploration of three-dimensional flow structures in tsunamis. This study proves that SPH is able to reproduce the runup of long waves for different initial and geometric conditions.…”

Section: Related Workmentioning

confidence: 99%

A Symmetric Particle-Based Simulation Scheme towards Large Scale Diffuse Fluids

et al. 2018

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We present a symmetric particle simulation scheme for diffuse fluids based on the Lagrangian Smoothed Particle Hydrodynamics (SPH) model. In our method, the generation of diffuse particles is determined by the entropy of fluid particles, and it is calculated by the velocity difference and kinetic energy. Diffuse particles are generated near the qualified diffuse particle emitters whose diffuse material generation rate is greater than zero. Our method fits the laws of physics better, as it abandons the common practice of adding diffuse materials at the crest empirically. The coupling between diffuse materials and fluid is a post-processing step achieved by the velocity field, which enables the avoiding of the time-consuming process of cross finding neighbors. The influence weights of the fluid particles are assigned based on the degree of coupling. Therefore, it improved the accuracy of the diffuse particle position and made the simulation results more realistic. The approach is appropriate for large scale diffuse fluid, as it can be easily integrated in existing SPH simulation methods and the computational overhead is negligible.

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Section: Related Workmentioning

confidence: 99%

A Symmetric Particle-Based Simulation Scheme towards Large Scale Diffuse Fluids

et al. 2018

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“…The major differences between the weakly compressible SPH (LUCY, 1977;MONAGHAN, 1992;DALRYMPLE et al, 2001) and the incompressible SPH (SHAO and LO, 2006;GOTOH et al, 2004) …”

Section: Smooth Particle Hydrodynamics Approachmentioning

confidence: 99%

“…The compressibility is adjusted to slow the speed of sound so that the time step in the model, based on the sound velocity, is reasonable. So, the mean time step is 2.1.10 -4 s. A Sub-Particle Scale (SPS) approach to modeling turbulence, first described by GOTOH et al (2001GOTOH et al ( , 2004 and adapted later for weakly incompressible fluid by DALRYMPLE and ROGERS (2006), is used. Governing equations are spatially averaged over a length scale comparable to the particle size.…”

Section: Sphysics Modelmentioning

confidence: 99%

Modelação da Interacção entre uma Onda e uma Estrutura de Protecção Costeira usando um Modelo Numérico SPH - Smoothed Particles Hydrodynamics

Didier¹,

Neves²

2010

RGCI

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Smoothed Particle Hydrodynamics (SPH) method is a mesh-free, Lagrangian, particle method for modeling freesurface flows. The potential range of applications is very wide (waves, impact on dams, offshore...) as the meshfree technique facilitates the simulation of highly distorted fluids/bodies, whereas Eulerian methods can be difficult to apply. Models based on SPH are an option to address coastal processes, particularly the interaction between waves and coastal structures, i.e. wave overtopping, that is a practical problem in coastal engineering. It involves complicated free surface deformations and SPH model is an ideal approach to simulate such a process. The paper presents an engineering application of SPH model to define the efficiency of a typical coastal structure of the Portuguese coast under stormy conditions. The model is used to characterize the run-up, free surface elevation near the structure and overtopping of the coastal structure, determining the maximum water velocity and water height over the structure. It is shown that numerical results, obtained for the prototype, present a similar trend comparing with data from physical modeling performed in test flume, using a model scale of 1:40.

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“…Of course the relevant parameters have to be carefully calibrated with an ad hoc procedure on the basis of available experimental data. Such an approach was first reported in Hsu et al (2002), later implemented in the COBRAS numerical code (i. e. Garcia et al 2004, Gotoh et al 2004, Greben et al 2008, Karim and Tingsanchali 2006, Lara et al 2006, Losada et al 2008, Requejo et al 2002.…”

Section: Introductionmentioning

confidence: 99%

Rubble Mound Breakwater Overtopping: Estimation of the Reliability of a 3d Numerical Simulation

Cavallaro

Dentale²,

Donnarumma³

et al. 2012

Int. Conf. Coastal. Eng.

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Until recently, physical models were the only way to investigate into the details of breakwaters behavior under wave attack. From the numerical point of view, the complexity of the fluid dynamic processes involved has so far hindered the direct application of Navier-Stokes equations within the armour blocks, due to the complex geometry and the presence of strongly non stationary flows, free boundaries and turbulence. In the present work the most recent CFD technology is used to provide a new and more reliable approach to the design analysis of breakwaters, especially in connection with run-up and overtopping. The solid structure is simulated within the numerical domain by overlapping individual virtual elements to form the empty spaces delimited by the blocks. Thus, by defining a fine computational grid, an adequate number of nodes is located within the interstices and a complete solution of the full hydrodynamic equations is carried out. In the work presented here the numerical simulations are carried out by integrating the three-dimensional Reynolds Average Navier-Stokes Equations coupled with the RNG turbulence model and a Volume of Fluid Method used to handle the dynamics of the free surface. The aim of the present work is to investigate the reliability of this approach as a design tool. Two different breakwaters are considered, both located in Southern Sicily: one a typical quarry stone breakwater, another a more complex design incorporating a spill basin and an armoured layer made up by Coreloc® blocks.

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SPH-LES Model for Numerical Investigation of Wave Interaction with Partially Immersed Breakwater

Cited by 146 publications

References 15 publications

A Symmetric Particle-Based Simulation Scheme towards Large Scale Diffuse Fluids

A Symmetric Particle-Based Simulation Scheme towards Large Scale Diffuse Fluids

Modelação da Interacção entre uma Onda e uma Estrutura de Protecção Costeira usando um Modelo Numérico SPH - Smoothed Particles Hydrodynamics

Rubble Mound Breakwater Overtopping: Estimation of the Reliability of a 3d Numerical Simulation

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