International Journal of Ocean and Coastal Engineering

Artificial revetments are commonly constructed on reef-flats to protect the rear infrastructure. Evaluating the performance of a revetment under extreme wave conditions requires accurate prediction of wave overtopping. To simulate tsunami wave overtopping on an artificial revetment above a coral reef-flat, a numerical model based on the weakly compressible smoothed particle hydrodynamics (WCSPH) method is developed. This numerical model includes an additional dissipative term in the continuity equation and a dynamic boundary condition enhancement to correct the pressure distortion from particles at the boundary. Reef topography is simplified as a steep reef-face and a horizontal reef-flat, and tsunami waves are described as solitary waves. This research explores the characteristics of solitary wave overtopping on the revetment above the reef-flat with varying slope angles and reef-flat lengths.

The wave impact on marine structures is concerning in ocean and coastal engineering. Cylinders are important components of various marine structures such as piers of sea-crossing bridge, columns of oil and gas platforms and subsea pipelines. In this study, the interaction of solitary wave with a submerged horizontal cylinder and a surface-piercing vertical cylinder are numerically studied by the Smoothed Particle Hydrodynamics (SPH) code SPHinXsys. SPHinXsys is an open-source multi-physics library based on the weakly compressible SPH and invokes the low-dissipation Riemann solver for alleviating numerical noises in the simulation of fluid dynamics. The capability of SPHinXsys in reproducing the fluid fields of solitary wave propagating through cylinders is demonstrated by comparing with the experimental data. With the validation in hand, the features of the wave–structure process are examined.

The fluid–soil interactions play a significant role in coastal and ocean engineering applications. However, there are still some complex mechanical problems with large deformations of water–soil interfaces to be solved. As a particle-based Lagrangian method, Smoothed Particle Hydrodynamics (SPH) is good at solving multiphase problems with large deformations of boundaries or interfaces. Therefore, in this work, the $\delta$-SPH method is extended for the simulation of fluid–soil interacting problems. First, based on the weakly compressible assumption, the water is modeled as a viscous fluid while the soil is considered as a material with elastic–perfectly plastic behaviors. The $\delta$-SPH method is implemented on the two phases separately, while the stress diffusive term only acts on the soil. The seepage force is introduced to model the interaction between two phases. After that, several numerical test cases with small to large interface deformations are presented. It is shown that the fluid–soil interacting model based on the $\delta$-SPH model gives satisfying results compared with experimental data. Finally, the model is further extended for the simulation of vertical or oblique water jet scouring problems which demonstrates the potential applications of the SPH model for complex engineering problems.

Physical protection of nearshore pipelines from marine life, ocean waves, and shipping activities is of critical importance in offshore engineering to guarantee reliable transition of energy. Mechanical damages such as buckling, dent, and cracks generated due to anchor-hooking threaten pipeline stability and need to be addressed from both engineering and scientific perspectives. In this study, we conduct a series of experimental and numerical simulations to investigate the interaction between an anchor and a trenchless rock berm constructed on soft saturated seabed, while the pipeline is laid in the berm. The experiments are performed in 1g tank, and the numerical tests are simulated with Coupled Eulerian–Lagrangian (CEL) finite element method. This study extends the available soil passive force formulation for the interaction of anchor–soil and compared its results with the numerical and experimental results. There is good agreement between the predictions of the numerical model and the experimental results. In addition, our work extends the available approaches to estimate soil passive forces for a dragged anchor. The stiffness of seabed and rock berm is important in the design of rock berm.

In this paper, we presented the multi-rational solution of the time-dependent $(3+1)$-dimensional Boiti–Leon–Manna–Pempinelli (BLMP) equations. We have used the generalized unified technique to construct multi-rational wave solutions for the BLMP equations. We included the representative solution plots corresponding to designated arbitrary functions in the solutions, which provide a physical insight about the structure of the solution. The interaction solution among lump wave, 1-soliton and periodic wave is presented. The breather-wave solution is obtained. Dynamical behavior is shown by abundant 3D, density and contour plot.