ocean wave energy
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2022 ◽  
Author(s):  
C. Windt

Abstract. Numerical modelling tools are commonly applied during the development and optimisation of ocean wave energy converters (WECs). Models are available for the hydrodynamic wave structure interaction, as well as the WEC sub–systems, such as the power take–off (PTO) model. Based on the implemented equations, different levels of fidelity are available for the numerical models. Specifically under controlled conditions, with enhance WEC motion, it is assumed that non-linearities are more prominent, re- quiring the use of high–fidelity modelling tools. Based on two different test cases for two different WECs, this paper highlights the importance of high–fidelity numerical modelling of WECs under controlled conditions.


2021 ◽  
Vol 12 (1) ◽  
pp. 51
Author(s):  
Safdar Rasool ◽  
Kashem M. Muttaqi ◽  
Danny Sutanto

Ocean wave energy is an abundant and clean source of energy; however, its potential is largely untapped. Although the concept of energy harvesting from ocean waves is antiquated, the advances in wave energy conversion technologies are embryonic. In many major studies related to wave-to-wire technologies, ocean waves are considered to be regular waves with a fixed amplitude and frequency. However, the actual ocean waves are the sum of multiple frequencies that exhibit a particular sea state with a significant wave height and peak period. Therefore, in this paper, detailed modelling of the ocean waves is presented and different wave spectra are analyzed. The wave spectra will eventually be used for the generation of wave elevation time series. Those time series can be used for the wave-to-wire model-based studies for improved investigations into wave energy conversion mechanisms, mimicking the real ocean conditions.


2021 ◽  
Vol 926 (1) ◽  
pp. 012073
Author(s):  
Y A Rahman ◽  
Setiyawan

Abstract With seas area of 70% larger than land, Indonesia encourages the potential for marine energy as an alternative to renewable energy. One of the technologies developed to utilize ocean energy is the Oscillating Water Column (OWC). The OWC method can convert ocean wave energy by using an oscillation column directing wave energy through the OWC door opening to generate electricity. This study aims to determine the magnitude of the waves utilized in West Central Sulawesi’s seas region include Alindau beach, Marana beach, and Kaliburu beach. Based on wave forecasting using wind data for five years, the maximum wave height for five years is 0.20 m. Estimated power from the calculation results obtained a rate significant with an efficiency level of 11.97%. Alindau is a potential location to develop wave energy.


2021 ◽  
Vol 11 (2) ◽  
pp. 429-436
Author(s):  
Widi Aribowo ◽  
Achmad Imam Agung ◽  
Subuh Isnur Haryudo ◽  
Syamsul Muarif

The need for electrical energy has increased every year. On the other hand, the largest power plants in Indonesia still use non-renewable energy sources such as coal and petroleum, while these non-renewable energy sources will eventually run out. To anticipate running out of this energy, a renewable energy source is needed. This existence will not run out even though it is consumed every day. Renewable energy that can be used for conversion into electrical energy in coastal areas is wave power.  The waves that always crash on the shoreline can be used to drive turbines. The turbine rotates due to the crashing waves connected to a DC generator. It will convert mechanical energy into electrical energy. The electrical energy generated by the DC generator is used to charge the battery. The purpose of this research is the know-how to design a wave power generator and to determine the performance. The experimental method is used in this study. In the results, the generator works optimally during the day with the resulting voltage of 10.6 V to 10.7 V with rotation speed of 623 Rpm to With 710 Rpm.


2021 ◽  
pp. 1-10
Author(s):  
Francisco Arias ◽  
Salvador De Las Heras

Abstract The possibility to convert the ocean wave energy into electrical energy by piezoelectric layers has excited the imagination of ocean wave energy conversion designers for decades owing to its relative robustness (no mechanical parts are needed), the capability to cover large areas and its relative low cost. Unfortunately, the very poor efficiency featured by piezoelectric layers in application of ocean waves has prevented its application even as energy harvester. Here, the possibility to induce hydrocavitation and then working with more higher local pressures for substantial efficiency enhancement is discussed. Utilizing a simplified geometrical and physical model and the linear and potential theory, a first theoretical estimation for the energy enhancement driven by hydrocavitation was calculated. It was found that the power could be enhanced several orders of magnitude which, although still rather low, however, the enhanced electric outputs can be used now as energy harvesters. Additional R&D is encouraged in order to explore the possibilities to harness hydrocavitation to enhance piezoelectric converters.


Author(s):  
Nicolás Faedo ◽  
Giordano Scarciotti ◽  
Alessandro Astolfi ◽  
John V. Ringwood

2021 ◽  
Author(s):  
Joseph Capper ◽  
Jia Mi ◽  
Qiaofeng Li ◽  
Lei Zuo

Abstract Easily portable, small-sized ocean wave energy converters (WECs) may be used in many situations where large-sized WEC devices are not necessary or practical. Power maximization for small-sized WECs amplifies challenges that are not as difficult with large-sized devices, especially tuning the device’s natural frequency to match the wave frequency and achieve resonance. In this study, power maximization is performed for a small-sized, two-body attenuator WEC with a footprint constraint of about 1m. A thin, submerged tuning plate is added to each body to increase added mass without significantly increasing hydrostatic stiffness in order to reach resonance. Three different body cross-section geometries are analyzed. Device power absorption is determined through time domain simulations using WEC-Sim with a simplified two-degree-of-freedom (2DOF) model and a more realistic three-degree-of-freedom (3DOF) model. Different drag coefficients are used for each geometry to explore the effect of drag. A mooring stiffness study is performed with the 3DOF model to investigate the mooring impact. Based on the 2DOF and 3DOF power results, there is not a significant difference in power between the shapes if the same drag coefficient is used, but the elliptical shape has the highest power after assigning a different approximate drag coefficient to each shape. The mooring stiffness study shows that mooring stiffness can be increased in order to increase relative motion between the two bodies and consequently increase the power.


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