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- Ransley et al.
Results from Blind Test Series 1, part of the Collaborative Computational Project in Wave Structure Interaction (CCPWSI), are presented. Participants, with a range of numerical methods, simulate blindly the interaction between a fixed structure and focused waves ranging in steepness and direction. Numerical results are compared against corresponding physical data. The predictive capability of…
- Yang et al.
Induction generators have been successfully applied to a variety of industries. However, their operation and maintenance in renewable wind and marine energy industries still face challenges due to harsh environments, limited access to site and relevant reliability issues. Hence, further enhancing their condition monitoring is regarded as one of the essential measures for improving their…
- Portillo et al.
This study concerns with the potential applicability of using wave energy converters, specially oscillating water columns, as monitoring buoys for operational oceanography. The concept of operational oceanography and the network of infrastructure and collaboration behind the concept is introduced, identifying the main sectors and stakeholders involved. 42 semistructured interviews were…
- Paterson et al.
This article presents a metocean modelling methodology using a Markov-switching autoregressive model to produce stochastic wind speed and wave height time series, for inclusion in marine risk planning software tools. By generating a large number of stochastic weather series that resemble the variability in key metocean parameters, probabilistic outcomes can be obtained to predict the…
- Mattarolo et al.
A numerical wave database called ANEMOC has been built by EDF R&D LNHE by hindcasting wave conditions over a period of 23 years and 8 months, between 1979 and 2002. The simulations of wave conditions are carried out with the third-generation spectral wave modelling software TOMAWAC and are driven by wind fields from the ERA-40 meteorological reanalysis produced by the European Centre…
- McCombes et al.
We present a numerical model for 3D time resolved wake calculations from marine current turbines. Since the wakes are characterised by the shedding of a vortex sheet from the rotor blades, we have constructed the model based around the vorticity transport equations. A vortex sheet may be considered a jump contact discontinuity in tangential velocity with, in inviscid hydrodynamic terms,…
- Patricio et al.
Future large-scale implementation of wave energy converts (WECs) will introduce an anthropogenic activity in the ocean which may contribute to underwater noise. The Ocean houses several marine species with acoustic sensibility; consequently the potential impact of the underwater noise needs to be addressed. At present, there are no acoustic impact studies based on acquired data. The WEAM…
- Alexandre et al.
As the deployment scale of wave farms increases towards hundreds of MW installed capacity, it becomes important to understand how nearshore coastal processes may be modified by energy extraction. Most of the published studies on the environmental impact of wave energy converters represent a group of devices using transmission and absorption coefficients. This approach represents the average…
- Turner and Owen
Aerodynamic models are typically used to model tidal turbines but the differences between wind and tidal turbines are such that these models may not accurately represent the performance of a tidal turbine. Aerodynamic models assume free flow whereas in a tidal channel the channel boundaries are likely to have an effect on turbine performance. Models for flows with three different boundary…
- Barrett et al.
The wave energy industry is entering a new phase of pre-commercial and commercial deployments of full-scale devices, so better understanding of seaway variability is critical to the successful operation of devices. The response of Wave Energy Converters (WEC) to incident waves govern their operational performance and for many devices, this is highly dependant on spectral shape due to their…
- Lalander and Leijon
Current measurement in the river Dalälven, situated in Sweden, was compared with flow values. These were also used to validate a numerical simulation of the channel. The results showed the numerical program was able to assess the current speed variations, but the magnitude of the current speed was slightly lower than the measured values, a possible effect of bathymetry errors. The water level…
- Flocard and Finnigan
This paper presents results from an experimental study on the power capture of bottom-pivoted pitching point absorbers in intermediate water depth subjected to regular and irregular waves. The present research investigates the respective influence of parameters such as geometry, damping and inertia modification (ballasting) on the performance of bottom-pivoted pitching wave energy converters…
- Norris
As the first facility of its kind anywhere in the world, EMEC provides wave and tidal developers with open- sea grid-connected testing facilities for single devices and small arrays. In addition to its technical and operational services, EMEC also provides in-depth assistance with all matters relating to the consenting of devices, which includes regular close liaison with regulators and…
- Andersen et al.
This paper provides a general description of the environmental monitoring programme currently ongoing at Vattenfall’s/Tussa’s wave power test site "Maren", on the Norwegian west coast. The purpose of the environmental monitoring is twofold: (i) to monitor the potential impact of the Maren installation on the environment, thereby fulfilling the consent requirements of the Norwegian…
- Duquette et al.
An experimental test rig has been constructed which is capable of recreating within a laboratory setting the dynamic response exhibited by a prime mover onto a motor–generator assembly. The prime mover can simulate from real or modeled time series data any varying source such as a wind turbine, a hydraulic motor or a wave energy air turbine.
The initial application around which the test…
- Xie et al.
The marine current turbine (MCT) is becoming more and more popular to produce eco-friendly electricity. However, its performance is negatively affected by MCT imbalance fault. In this paper, an integration fault detection method using stator voltage for MCT is proposed. This method uses an integration way to detect the imbalance fault. The proposed method comprises three steps: First, the data…
- Rutgersson et al.
A coupled regional atmosphere-wave model system is developed with the purpose of investigating the impact of climate changes on the wave field as well as feed-back effects of waves on the atmospheric parameters. This study focuses on the effects of introducing a two-way atmosphere-wave coupling on the atmosphere and on wave parameters. The model components used are the regional climate model…
- Trigo-Teixeira and Rebordão
A hydrodynamic model was set up for the Lima estuary (Portugal) and a preliminary assessment of the strength of tidal currents to produce tidal energy was made. To calibrate the model results were compared with measured data, and the model tuned to reproduce water levels and currents in several locations within the estuary. The data was acquired with ADCPs, during a field campaign that was…
- Venugopal and Smith
This paper presents the results of a study carried out to determine the change in wave climate around an array of hypothetical wave devices. The main objective of this work is to investigate the change in wave height in the upstream and downstream of the devices for different levels of wave absorption. This is achieved by modeling the wave devices as porous structures with different porosity…
- Forestier et al.
This article describes the specifics of WEC physical testing compared to offshore platform testing and exposes the reasons of performing initial tests at small scales. The first difference is that WECs have larger and thus more nonlinear motions. These large amplitudes of motions imply the necessity of a rigorous representation of the rotation of the device. The second difference is the…
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