Hydrodynamic analysis of oscillating water column wave energy devices

Abstract

A 40-chamber I-Beam attenuator-type, oscillating water column, wave energy converter is analyzed numerically based on linearized potential flow theory, and experimentally via model test experiments. The high-order panel method WAMIT by Newman and Lee (WAMIT; a radiation-diffraction panel program for wave-body interactions, 2014, http://www.wamit.com) is used for the basic wave-structure interaction analysis. The damping applied to each chamber by the power take off is modeled in the experiment by forcing the air through a hole with an area of about 1 % of the chamber water surface area. In the numerical model, this damping is modeled by an equivalent linearized damping coefficient which extracts the same amount of energy over one cycle as the experimentally measured quadratic damping coefficient. The pressure in each chamber in regular waves of three different height-tolength ratios is measured in the experiments and compared to calculations. The model is considered in both fixed and freely floating, slack-moored conditions. Comparisons are also made to experimental measurements on a single fixed

Cost Optimization of Mooring Solutions for Large Floating Wave Energy Converters

“…The four WECs are the Floating Power Plant [16], KNSwing [17,18], LEANCON Wave Energy [19] and Wave Dragon [20], cf. Figure 2.…”

Performance Assessment of a Hybrid Wave Energy Converter Integrated into a Harbor Breakwater

“…The integration of WEC devices into breakwaters and other coastal structures is an approach that can bring benefits relative to standalone devices [16] whilst ensuring the main functions of these coastal structures. The most challenging issues in the development of technologies for WEC-breakwater integration are:Energies 2020, 13, 236 3 of 22 WEC technologies considered were the sea-wave slot-cone generator (SSG) [16,24,25] and a shore based OWC [26,27]. It has also been established that the integration of the HWEC module into the breakwater does not significantly affect neither its effectiveness nor its stability [28,29].…”

“…Energies 2020, 13, 236 3 of 22 WEC technologies considered were the sea-wave slot-cone generator (SSG) [16,24,25] and a shore based OWC [26,27]. It has also been established that the integration of the HWEC module into the breakwater does not significantly affect neither its effectiveness nor its stability [28,29].…”

“…Previous studies concluded that the best working principles to be merged in a hybrid device and integrated into a seaport breakwater were the OWEC and the OWC [23], and thus the two The Port of Leixões' energy consumption has increased by 14.8% from 2014 to 2016, and the port is expected to improve and enlarge its facilities in the near future [26]. Consequently, the development of sustainable solutions for meeting the increasing energy demand in the port is desired.…”

“…The extension of Leixões North breakwater is a key component of the port's development plan, and constitutes an opportunity for the integration of a WEC in the structure, as the installation cost should be lower and the adaption of the breakwater's design simpler if the integration is considered upon the design phase. For that reason, the SE@PORTS project studied the integration of a HWEC into this harbor structure, namely by assessing its power output for several wave conditions The Port of Leixões' energy consumption has increased by 14.8% from 2014 to 2016, and the port is expected to improve and enlarge its facilities in the near future [26]. Consequently, the development of sustainable solutions for meeting the increasing energy demand in the port is desired.…”