Identifying knowledge gaps hampering application of intertidal habitats in coastal protection: Opportunities & steps to take

Wave attenuation by flexible, idealized salt marsh vegetation

https://repository.tudelft.nl/islandora/object/uuid%3Ae82fa129-094a-46b4-944d-b0ae7c1de284/datastream/OBJ/download

Nature-based flood protection: The efficiency of vegetated foreshores for reducing wave loads on coastal dikes

Wave-induced dynamics of flexible blades

Particle methods in ocean and coastal engineering

Wave energy and wave-induced flow reduction by full-scale model Posidonia oceanica seagrass

Coupling methodology for smoothed particle hydrodynamics modelling of non-linear wave-structure interactions

Renewable energy is constantly being developed to reduce the dependency on fossil fuels. Energy from ocean waves can be utilized by installing Wave Energy Converters (abbreviated as WECs) in the sea, which are devices that convert the kinetic and/or potential energy of waves into electricity. Many concepts of WECs have already been developed, mainly distinguished based on the conversion principle, in (i) oscillating water columns and wave-activated bodies, which oscillate under incident waves, and (ii) overtopping devices, which capture the overtopped waves in a basin above sea level that creates a hydraulic head. In order to extract a considerable amount of energy at a specific site location, the installation of large numbers of WECs will be required, arranged using specific geometric configuration. In this chapter, an overview of typically performed research on waveactivated bodies and WEC arrays is provided, since this PhD dissertation deals with arrays of this WEC type. In contrast to the large body of numerical simulations of WEC arrays and the physical modelling of individual WECs or pairs of WECs, very few experimental studies are publically available which deal with only small WEC arrays. There is, therefore, a lack of physical modelling studies on large WEC arrays and a clear need to perform such experiments, which has been dealt with within the main objective of this PhD research.

https://biblio.ugent.be/publication/5934441/file/5934450.pdf

Experimental study and numerical modelling of intra-array interactions and extra-array effects of wave energy converter arrays

This chapter describes the use of a phase-resolving wave propagation model, MILDwave (based on the mild-slope equations), for assessing the park effect in arrays of wave energy converters (WECs) and the far-field wake effects of the arrays. The implementation of the WEC (array) is carried out using the numerical techniques of so-called sponge layers and wave generation along a circle, to simulate the physical process of energy absorption by the WEC, and the resulting wave transformation processes of reflection, diffraction, and radiation. A generic coupling methodology is presented for modelling accurately both the wave energy absorption by the WEC and the propagation of the perturbed wave field over larger distances, allowing the study of the coastal impact of arrays. The approach is applied in a practical situation to study the wave height reduction behind a single WEC and a farm of WECs, and advantages and limitations are discussed.

Phase-Resolving Wave Propagation Array Models

Wave Energy Converters (WECs) need to be deployed in large numbers in an array layout in order to have a significant power production. Each WEC has an impact on the incoming wave field, by diffracting, reflecting and radiating waves. Simulating the wave transformations within and around a WEC array is complex; it is difficult, or in some cases impossible, to simulate both these near-field and far-field wake effects using a single numerical model, in a time- and cost-efficient way in terms of computational time and effort. Within this research, a generic coupling methodology is developed to model both near-field and far-field wake effects caused by floating (e.g., WECs, platforms) or fixed offshore structures. The methodology is based on the coupling of a wave-structure interaction solver (Nemoh) and a wave propagation model. In this paper, this methodology is applied to two wave propagation models (OceanWave3D and MILDwave), which are compared to each other in a wide spectrum of tests. Additionally, the Nemoh-OceanWave3D model is validated by comparing it to experimental wave basin data. The methodology proves to be a reliable instrument to model wake effects of WEC arrays; results demonstrate a high degree of agreement between the numerical simulations with relative errors lower than 5 % and to a lesser extent for the experimental data, where errors range from 4 % to 17 % .

/pdf/a-comparison-study-of-a-generic-coupling-methodology-for-49pcwffp9s.pdf

Vicky Stratigaki

Papers

Wave energy and wave-induced flow reduction by full-scale model Posidonia oceanica seagrass

Coupling methodology for smoothed particle hydrodynamics modelling of non-linear wave-structure interactions

Experimental study and numerical modelling of intra-array interactions and extra-array effects of wave energy converter arrays

Phase-Resolving Wave Propagation Array Models

A Comparison Study of a Generic Coupling Methodology for Modeling Wake Effects of Wave Energy Converter Arrays