The article aims at providing an up-to-date review on several latest advancements related to particle methods with applications in coastal and ocean engineering. The latest advancements corresponding to accuracy, stability, conservation properties, multiphase multi-physics multi-scale simulations, fluid-structure interactions, exclusive coastal/ocean engineering applications and computational efficiency are reviewed. The future perspectives for further enhancement of applicability and reliability of particle methods for coastal/ocean engineering applications are also highlighted.

/pdf/on-the-state-of-the-art-of-particle-methods-for-coastal-and-4emfnigqnn.pdf

On the state-of-the-art of particle methods for coastal and ocean engineering

https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.1987.32.5.1177

Wave interactions and fluid flows

Innovative rubble mound breakwaters for overtopping wave energy conversion

Three-dimensional numerical wave generation with moving boundaries

https://pure.hw.ac.uk/ws/files/25140027/Zhao_Ning_Zou_BreakWater_WEC_Review_FinalAccepted_OE2019.pdf

Hybrid floating breakwater-WEC system: A review

A new methodology is proposed for the generation of breaking focused waves in computational fluid dynamics (CFD) simulations. The application of the methodology is illustrated for a numeric...

https://ascelibrary.org/doi/pdf/10.1061/%28ASCE%29WW.1943-5460.0000420

Simulating breaking focused waves in CFD: Methodology for controlled generation of first and second order

Although existing knowledge on the vertical distribution of impact pressures on sea-dikes is well established only very little is known with respect to their horizontal distribution. A collaboration developed between the University of Southampton, Uk and FZK, Hannover looks in more detail at the distribution of pressures induced by waves breaking on the face of a sea-dike. For this, 2D large scale experiments with waves breaking on a 1:3 sea dike were conducted but instead of pressure transducers a tactile pressure sensor was used to map the impact pressures. Such sensors were initially used with breaking waves in the University of Southampton and their use for large scale experiments was attempted here for the first time. In the current paper the calibration and application of the tactile sensor for experiments involving up to 1m high and 8sec long waves are initially described. Preliminary results illustrating the simultaneous distribution of impact induced pressures over an area of 426.7x487.7mm are then presented. Based on these pressure maps the vertical and horizontal location of maximum breaking wave induced pressures is also deduced.

/pdf/distribution-of-impact-induced-pressures-at-the-face-of-89uhrv91gh.pdf

Distribution of impact induced pressures at the face of uniformly sloped sea dikes: preliminary 2d experimental results

Current blockage in sheared flow: Experiments and numerical modelling of regular waves and strongly sheared current through a space-frame structure

An experimental study on wave forces on a vertical cylinder due to spilling breaking and near-breaking wave groups

Focused waves are often used in physical and numerical studies as a representative condition for extreme waves or as a means to generate very steep and breaking waves at a prescribed location in space and time. They have also been combined with depth-varying currents in investigations of incipient wave breaking, wave breaking–induced energy dissipation, and wave–current induced loads on marine structures. A focused wave is created when all the components in a transient wave group come into phase. In the past, linear wave theory and iterative methodologies coupled with the linear Doppler-shifted dispersion relationship have been suggested to account for the presence of a current and achieve the required phase and amplitude focusing. In the majority of cases, linear or constant steepness spectra are used, which, compared to measured or theoretical spectra like the Joint North Sea Wave Project (JONSWAP), Gaussian, and Pierson-Moskowitz (PM) can be termed unrealistic. The effectiveness of these methodologies also decreases as the nonlinearity increases; therefore, in most studies, either weakly nonlinear conditions are used or the focus location is determined empirically. Here, an iterative methodology is suggested that can focus waves of any height at a predetermined temporal and spatial location even for wave groups propagating on a strong following or adverse current. An experimental apparatus developed to generate relatively stable sheared velocity profiles is also described. The depth-varying profile of the resulting currents diverges from that of classical wind-driven currents and comes closer to profiles measured in field sites important for the deployment of, for instance, tidal and wind energy converters. The methodology is successfully applied to wave groups traveling on still water, following, and adverse currents, and the results presented refer to linear, weakly nonlinear, and strongly nonlinear–focused waves generated for a range of realistic target spectra. The capability to generate wave groups with the same amplitude spectrum at a fixed location for a variety of flow conditions—still water, following, and adverse sheared currents—is also illustrated.

/pdf/experimental-generation-of-focusing-wave-groups-on-following-coa1o81mfw.pdf

Dimitris Stagonas

Papers

Simulating breaking focused waves in CFD: Methodology for controlled generation of first and second order

Distribution of impact induced pressures at the face of uniformly sloped sea dikes: preliminary 2d experimental results

Current blockage in sheared flow: Experiments and numerical modelling of regular waves and strongly sheared current through a space-frame structure

An experimental study on wave forces on a vertical cylinder due to spilling breaking and near-breaking wave groups

Experimental Generation of Focusing Wave Groups on Following and Adverse-Sheared Currents in a Wave-Current Flume