Artykuły w czasopismach na temat „Wave energy”
Kliknij ten link, aby zobaczyć inne rodzaje publikacji na ten temat: Wave energy.
Utwórz poprawne odniesienie w stylach APA, MLA, Chicago, Harvard i wielu innych
Sprawdź 50 najlepszych artykułów w czasopismach naukowych na temat „Wave energy”.
Przycisk „Dodaj do bibliografii” jest dostępny obok każdej pracy w bibliografii. Użyj go – a my automatycznie utworzymy odniesienie bibliograficzne do wybranej pracy w stylu cytowania, którego potrzebujesz: APA, MLA, Harvard, Chicago, Vancouver itp.
Możesz również pobrać pełny tekst publikacji naukowej w formacie „.pdf” i przeczytać adnotację do pracy online, jeśli odpowiednie parametry są dostępne w metadanych.
Przeglądaj artykuły w czasopismach z różnych dziedzin i twórz odpowiednie bibliografie.
1
Kawaguchi, Takashi, Kunio Nakano, Shogo Miyajima i Taro Arikawa. "WAVE ENERGY CONVERTER WITH WAVE ABSORBING CONTROL". Coastal Engineering Proceedings, nr 36 (30.12.2018): 61. http://dx.doi.org/10.9753/icce.v36.papers.61.
Pełny tekst źródłaStreszczenie:
The wave absorbing control using wave sensors was theorized and developed by the authors, about 30 years ago. It was originally for absorbing wavemakers for tank tests in laboratories. This control enables wavemakers to generate the desired incident waves while absorbing undesirable reflected waves from the tank wall. When waves are absorbed by the wavemaker, the energy of the waves are also absorbed, that is, the energy is regenerated to electric power with the wavemaker drivemotor. According to this theory, in case that certain waves are generated by an oscillating body, these waves can be absorbed by the same body. Therefore, we can design a wave energy converter as a kind of absorbing wavemaker.
2
KONNO, Toshio, Yoshihiro NAGATA, Manabu TAKAO i Toshiaki SETOGUCHI. "C107 RADIAL TURBINE WITH AIRFLOW RECTIFICATION SYSTEM FOR WAVE ENERGY CONVERSION(Solar, Wind and Wave Energy-2)". Proceedings of the International Conference on Power Engineering (ICOPE) 2009.1 (2009): _1–167_—_1–171_. http://dx.doi.org/10.1299/jsmeicope.2009.1._1-167_.
Pełny tekst źródła
3
Troch, Peter, Charlotte Beels, Julien De Rouck i Griet De Backer. "WAKE EFFECTS BEHIND A FARM OF WAVE ENERGY CONVERTERS FOR IRREGULAR LONG-CRESTED AND SHORT-CRESTED WAVES". Coastal Engineering Proceedings 1, nr 32 (1.02.2011): 53. http://dx.doi.org/10.9753/icce.v32.waves.53.
Pełny tekst źródłaStreszczenie:
The contribution of wave energy to the renewable energy supply is rising. To extract a considerable amount of wave power, Wave Energy Converters (WECs) are arranged in several rows or in a ’farm’. WECs in a farm are interacting (e.g. the presence of other WECs influence the operational behaviour of a single WEC) and the overall power absorption is affected. In this paper wake effects in the lee of a single WEC and multiple WECs of the overtopping type, where the water volume of overtopped waves is first captured in a basin above mean sea level and then drains back to the sea through hydro turbines, are studied using the time-dependent mild-slope equation model MILDwave. The wake behind a single WEC is investigated for long-crested and short-crested incident waves. The wake becomes wider for larger wave peak periods. An increasing directional spreading results in a faster wave regeneration and a shorter wake behind the WEC. The wake in the lee of multiple WECs is calculated for two different farm lay-outs, i.e. an aligned grid and a staggered grid, with varying lateral and longitudinal spacing. The wave power redistribution in and behind each farm lay-out is studied in detail using MILDwave. In general, the staggered grid results in the highest overall wave power absorption.
4
Nian, Ting Kai, Bo Liu i Ping Yin. "Seafloor Slope Stability under Adverse Conditions Using Energy Approach". Applied Mechanics and Materials 405-408 (wrzesień 2013): 1445–48. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.1445.
Pełny tekst źródłaStreszczenie:
The effects of ocean waves on the stability of seafloor slopes are of great importance in marine environment. The stability of a seafloor slope considering wave-induced pressure is analyzed using the kinematic approach of limit analysis combined with a strength reduction technique. A seafloor slope without waves is considered first. Furthermore, waved-induced pressure is considered to act on the surface of slope as an external load to analyze the effects on the stability of slope by waves. The results show that the adverse effect of waves on slope stability increases with an increase of the wave height as well as a decrease of the water depth.
5
Smith, Warren R. "Wave–structure interactions for the distensible tube wave energy converter". Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 472, nr 2192 (sierpień 2016): 20160160. http://dx.doi.org/10.1098/rspa.2016.0160.
Pełny tekst źródłaStreszczenie:
A comprehensive linear mathematical model is constructed to address the open problem of the radiated wave for the distensible tube wave energy converter. This device, full of sea water and located just below the surface of the sea, undergoes a complex interaction with the waves running along its length. The result is a bulge wave in the tube which, providing certain criteria are met, grows in amplitude and captures the wave energy through the power take-off mechanism. Successful optimization of the device means capturing the energy from a much larger width of the sea waves (capture width). To achieve this, the complex interaction between the incident gravity waves, radiated waves and bulge waves is investigated. The new results establish the dependence of the capture width on absorption of the incident wave, energy loss owing to work done on the tube, imperfect tuning and the radiated wave. The new results reveal also that the wave–structure interactions govern the amplitude, phase, attenuation and wavenumber of the transient bulge wave. These predictions compare well with experimental observations.
6
Gonzalez C., Rodolfo S. "Teoría de Gravedad "Energy-Wave": el origen". ALTAmira Revista Académica 2, nr 5 (1.06.2014): 50–61. http://dx.doi.org/10.15418/altamira5001.
Pełny tekst źródła
7
Shao, Cheng, i Xao Yu Yuan. "Exploiting of Ocean Wave Energy". Advanced Materials Research 622-623 (grudzień 2012): 1143–46. http://dx.doi.org/10.4028/www.scientific.net/amr.622-623.1143.
Pełny tekst źródłaStreszczenie:
Sea waves are a very promising energy carrier among renewable power sources, and so many devices to convert wave energy into electrical energy have been invented. This paper discussed the fundamentals of ocean wave energy, summarized the wave energy research being conducted. And the purpose is to take refers to scientists and engineers in this area.
8
Perfect, B., N. Kumar i J. J. Riley. "Energetics of Seamount Wakes. Part II: Wave Fluxes". Journal of Physical Oceanography 50, nr 5 (maj 2020): 1383–98. http://dx.doi.org/10.1175/jpo-d-19-0104.1.
Pełny tekst źródłaStreszczenie:
AbstractSeamounts are thought to facilitate ocean mixing through unsteady wake processes, and through the generation of internal waves, which propagate away from the seamount and later break. The relative importance of these processes is examined for idealized, isolated seamounts (with characteristic width D and height H) in uniform barotropic flow U. A range of Coriolis parameters f and buoyancy frequencies N are used such that a broad parameter space of low Froude numbers (U/NH) and low Rossby numbers (U/fD) is considered. Results indicate that eddy processes energetically dominate the internal wave energy flux in this range of parameter space. The internal wave field is specifically examined and partitioned into steady lee waves and unsteady, wake-generated waves. It is found that the lee wave energy flux cannot be explained by existing analytical theories. A lee wave model by Smith is then extended into the low-Froude-number regime and the effect of rotation is included. While strongly stratified experiments have previously indicated that only the top U/N of an obstacle generates internal waves, the effect of rotation appears to modify this wavemaking height. Once the U/N height is revised to account for rotation, the lee wave energy flux can be reasonably accurately reproduced by the extended Smith model.
9
Verao Fernandez, Gael, Vasiliki Stratigaki, Panagiotis Vasarmidis, Philip Balitsky i Peter Troch. "Wake Effect Assessment in Long- and Short-Crested Seas of Heaving-Point Absorber and Oscillating Wave Surge WEC Arrays". Water 11, nr 6 (29.05.2019): 1126. http://dx.doi.org/10.3390/w11061126.
Pełny tekst źródłaStreszczenie:
In the recent years, the potential impact of wave energy converter (WEC) arrays on the surrounding wave field has been studied using both phase-averaging and phase-resolving wave propagation models. Obtaining understanding of this impact is important because it may affect other users in the sea or on the coastline. However, in these models a parametrization of the WEC power absorption is often adopted. This may lead to an overestimation or underestimation of the overall WEC array power absorption, and thus to an unrealistic estimation of the potential WEC array impact. WEC array power absorption is a result of energy extraction from the incoming waves, and thus wave height decrease is generally observed downwave at large distances (the so-called “wake” or “far-field” effects). Moreover, the power absorption depends on the mutual interactions between the WECs of an array (the so-called “near field” effects). To deal with the limitations posed by wave propagation models, coupled models of recent years, which are nesting wave-structure interaction solvers into wave propagation models, have been used. Wave-structure interaction solvers can generally provide detailed hydrodynamic information around the WECs and a more realistic representation of wave power absorption. Coupled models have shown a lower WEC array impact in terms of wake effects compared to wave propagation models. However, all studies to date in which coupled models are employed have been performed using idealized long-crested waves. Ocean waves propagate with a certain directional spreading that affects the redistribution of wave energy in the lee of WEC arrays, and thus gaining insight wake effect for irregular short-crested sea states is crucial. In our research, a new methodology is introduced for the assessment of WEC array wake effects for realistic sea states. A coupled model is developed between the wave-structure interaction solver NEMOH and the wave propagation model MILDwave. A parametric study is performed showing a comparison between WEC array wake effects for regular, long-crested irregular, and short-crested irregular waves. For this investigation, a nine heaving-point absorber array is used for which the wave height reduction is found to be up to 8% lower at 1.0 km downwave the WEC array when changing from long-crested to short-crested irregular waves. Also, an oscillating wave surge WEC array is simulated and the overestimation of the wake effects in this case is up to 5%. These differences in wake effects between different wave types indicates the need to consider short-crested irregular waves to avoid overestimating the WEC array potential impacts. The MILDwave-NEMOH coupled model has proven to be a reliable numerical tool, with an efficient computational effort for simulating the wake effects of two different WEC arrays under the action of a range of different sea states.
10
Gao, Hong, i Zhiheng Wang. "Hydrodynamic Response Analysis and Wave Energy Absorption of Wave Energy Converters in Regular Waves". Marine Technology Society Journal 51, nr 1 (1.01.2017): 64–74. http://dx.doi.org/10.4031/mtsj.51.1.7.
Pełny tekst źródłaStreszczenie:
AbstractThe hydrodynamic response and the energy capture analysis of wave energy converters (WECs) with three degrees of freedom are conducted using a frequency domain approach. Considering the coupled hydrodynamic coefficients between surge and pitch, motion responses in surge, heave, and pitch are solved for the WECs. The power take-off (PTO) damping is taken as a linear function of the velocity. The power absorption and the absorption efficiency in surge, heave, and pitch are analyzed and compared. The effects of the geometry, diameter, draft, center of gravity position, and PTO damping on the hydrodynamic response, the power absorption, and the absorption efficiency of WECs are investigated. A cylinder, a halfsphere cylinder, and a cone cylinder are examined. From the total power absorption and the efficiency, the cone is the optimum geometry. For the cylinder, the power absorption in heave increases obviously with the increase of the diameter or the draft in a certain range. For the cone, the effect of diameter and draft on the power absorption in heave is relatively small. The cone has a better ability to absorb power in surge and pitch with an intermediate draft and diameter, and the power absorption peak in pitch decreases as Zg increases. The center of gravity position has no effect on the hydrodynamic response and the power absorption in heave. For a cylinder, the optimal PTO damping in heave is higher than that in pitch and surge. The optimum frequency in heave is lower than that in pitch and surge.
11
Schultz, William W., Jin Huh i Owen M. Griffin. "Potential energy in steep and breaking waves". Journal of Fluid Mechanics 278 (10.11.1994): 201–28. http://dx.doi.org/10.1017/s0022112094003678.
Pełny tekst źródłaStreszczenie:
We find that the RMS wave height (square root of the potential energy) rather than peak-to-peak wave height is a better experimental and analytic criterion for determining when a regular, two-dimensional deep-water wave will break. A spectral algorithm for two-dimensional potential flow is developed and used to compare breaking onset criteria for energy input from (i) converging sidewalls, (ii) a submerged disturbance, and (iii) wave focusing. We also find that wave-breaking criteria (potential energy or the more classical peak-to-peak wave height) are a function of the rate of energy input. Large plunging waves occur when energy input rates are large. As energy input rates become smaller there is a smooth transition to smaller spilling waves. The various energy input methods show similar breaking trends in the limit as the energy input rate becomes small - waves break when the potential energy becomes approximately 52 % of the energy for the most energetic Stokes wave, with the formation of a singularity immediately before the crest. The effects of wave modulation and reflection are briefly discussed and shown not to affect the potential energy breaking criterion significantly. The experimental scatter of the RMS wave height is shown to be half that of wave steepness during incipient breaking in wave packets.
12
Lin, Lihwa, Zeki Demirbilek, Jinhai Zheng i Hajime Mase. "RAPID CALCULATION OF NONLINEAR WAVE-WAVE INTERACTIONS". Coastal Engineering Proceedings 1, nr 32 (27.01.2011): 36. http://dx.doi.org/10.9753/icce.v32.waves.36.
Pełny tekst źródłaStreszczenie:
This paper presents an efficient numerical algorithm for the nonlinear wave-wave interactions that can be important in the evolution of coastal waves. Indeed, ocean waves truly interact with each others. However, because ocean waves can also interact with the atmosphere such as under variable wind and pressure fields, and waves will deform from deep to shallow water, it is generally difficult to differentiate the actual amount of the nonlinear energy transfer among spectral waves mixed with the atmospheric input and wave breaking. The classical derivation of the nonlinear wave energy transfer has involved tedious numerical calculation that appears impractical to the engineering application. The present study proposed a theoretically based formulation to efficiently calculate nonlinear wave-wave interactions in the spectral wave transformation equation. It is approved to perform well in both idealized and real application examples. This rapid calculation algorithm indicates the nonlinear energy transfer is more significant in the intermediate depth than in deep and shallow water conditions.
13
Cascajo, Raúl, Emilio García, Eduardo Quiles, Francisco Morant i Antonio Correcher. "Wave Energy Assessment at Valencia Gulf and Comparison of Energy Production of Most Suitable Wave Energy Converters". International Journal of Environmental Research and Public Health 17, nr 22 (16.11.2020): 8473. http://dx.doi.org/10.3390/ijerph17228473.
Pełny tekst źródłaStreszczenie:
Seaports’ energy strategy should rely on the use of renewable energy. Presently, the share of renewable energy used by many of the ports worldwide is negligible. Some initiatives are in the process of implementation to produce some of the energy used by the Port of Valencia, one the largest ports in the Mediterranean Basin. Among these initiatives, a photovoltaic plant with an installed capacity of 5.5 MW is under a tendering process and the assessment studies for the deployment of three to five windmills are close to being finished. However, this is not enough to make it a “zero emissions port” as some of the energy demand would still be covered by fossil fuels. Therefore, we should consider clean alternative energy sources. This article analyses the wave energy resources in the surroundings of the Port of Valencia using a 7-year series of data obtained from numerical modelling (forecast). The spatial distribution of wave power is analysed using data from 3 SIMAR points at Valencia Bay and is compared to the data obtained by the Valencia Buoy I (removed in 2005). The obtained results are used to estimate the power matrices and the average energy output of two wave energy converters suitable to be integrated into the port’s infrastructure. Finally, the wave energy converters’ production is compared to the average amount of energy that is forecast to be obtained from other renewable sources such as solar and wind. Due to the nature of the Gulf’s wave climate (mostly low waves), the main conclusion is that the energy obtainable from the waves in the Valencia Gulf will be in correlation with such climate. However, when dealing with great energy consumers every source of production is worthwhile and further research is needed to optimize the production of energy from renewable sources and its use in an industrial environment such as ports.
14
Aminuddin, Jamrud, Mukhtar Effendi, Nurhayati Nurhayati, Agustina Widiyani, Pakhrur Razi, Wihantoro Wihantoro, Abdullah Nur Aziz i in. "Numerical Analysis of Energy Converter for Wave Energy Power Generation-Pendulum System". International Journal of Renewable Energy Development 9, nr 2 (20.04.2020): 255–61. http://dx.doi.org/10.14710/ijred.9.2.255-261.
Pełny tekst źródłaStreszczenie:
The wave energy power generation-pendulum system (WEPG-PS) is a four-wheeled instrument designed to convert wave power into electric energy. The first wheel is connected to the pendulum by a double freewheel, the second and third are ordinary wheels, while the fourth is a converter component that is axially connected to the electric generator. This design used the Euler-Lagrange formalism and Runge-Kutta method to examine an ideal dimension and determine the numerical solution of the equation of motion related to the rotation speed of the wheels. The result showed that the WEPG-PS' converter system rotated properly when its mass, length, and moment of inertia are 10 kg, 2.0 m, and 0.25 kgm2, respectively. This is in addition to when the radius of the first, second, third, and fourth wheels are 0.5, 0.4, 0.2, and 0.01 m, with inertia values of 0.005, 0.004, 0.003, and 0.1 kgm2. The converter system has the ability to rotate the fourth wheel, which acts as the handle of an electric generator at an angular frequency of approximately 500 - 600 rad/s. The converter system is optimally rotated when driven by a minimum force of 5 N and maximum friction of 0.05. Therefore, the system is used to generate electricity at an amplitude of 0.3 - 0.61 m, 220 V with 50 Hz. Besides, the lower rotation speed and frequency of the energy converter of the WEPG-PS (300 rad/s) and induction generator (50 Hz) were able to generate electric power of 7.5 kW. ©2020. CBIORE-IJRED. All rights reserved
15
Pontes, M. T., L. Cavaleri i Denis Mollison. "Ocean Waves: Energy Resource Assessment". Marine Technology Society Journal 36, nr 4 (1.12.2002): 42–51. http://dx.doi.org/10.4031/002533202787908662.
Pełny tekst źródłaStreszczenie:
The aim of this paper is to provide a general view of wave energy resource assessment. First, a review of the origin of waves and the transformation they undergo as they propagate towards the coast through waters of decreasing depth is presented. Following this, the wave and wave-energy parameters and the statistics required for resource characterization are described. The various types of wave data and their usefulness for the present purposes are summarised. A common methodology for assessment of the wave energy resource is developed. Finally, a general description of the global open ocean resource is presented.
16
Qin, Shufang, Jun Fan, Haiming Zhang, Junwei Su i Yi Wang. "Flume Experiments on Energy Conversion Behavior for Oscillating Buoy Devices Interacting with Different Wave Types". Journal of Marine Science and Engineering 9, nr 8 (8.08.2021): 852. http://dx.doi.org/10.3390/jmse9080852.
Pełny tekst źródłaStreszczenie:
Oscillating buoy device, also known as point absorber, is an important wave energy converter (WEC) for wave energy development and utilization. The previous work primarily focused on the optimization of mechanical design, buoy’s array configuration and the site selection with larger wave energy density in order to improve the wave energy generation performance. In this work, enlightened by the potential availability of Bragg reflection induced by multiple submerged breakwaters in nearshore areas, we investigate the energy conversion behavior of oscillating buoy devices under different wave types (traveling waves, partial and fully standing waves) by flume experiments. The localized partial standing wave field is generated by the Bragg resonance at the incident side of rippled bottoms. Furthermore, the fully standing wave field is generated by the wave reflection of vertical baffle installed in flume. Then the wave power generation performance is discussed under the conditions with the same wave height but different wave types. The experimental measurements show that the energy conversion performance of the oscillating buoy WEC could be improved under the condition of standing waves when compared with traveling waves. This work provides the experimental comparison evidence of wave energy conversion response of oscillating buoy devices between travelling waves and standing (fully or partial) wave conditions.
17
Iskandarova, Marfuga, i Elena Simakova. "Technologising the wave". Digital Scholar: Philosopher's Lab 3, nr 1 (2020): 101–22. http://dx.doi.org/10.5840/dspl2020319.
Pełny tekst źródłaStreszczenie:
Despite the recent shift from renewable energy to a low carbon policy, the UK policy discourse still recognises marine energy as part of the country’s future energy mix. Production of what we call an “assemblage” of technology and ocean waves triggers complex sets of initiatives that provide the basis for the economic viability and credibility of wave energy extraction. However, questions are rarely asked about how the natural phenomenon being part of this assemblage is construed as a resource to become a key element of promises and assessments of potential of renewable energy. This study sheds light on under-explored aspects of the credibility–economy and valuation practices formed around renewable energy that have not yet been problematised in social studies of energy. Arguing that ocean waves become an energy resource largely through resource assessment practices, we examine such practices in the context of the production of scientific and policy discourses around wave energy. Considering waves as an object of expertise, we examine how “wave data” constituted through measurements, statistical analysis, modelling and visualisation, contribute to the assessment and legitimisation of wave energy developments. We also evaluate the prospects for wave energy to be a “good” in future economic exchange.
18
Basu, Rahul. "Technological and Economic Aspects of Wave Energy Harvesting." Journal of Engineering, Project, and Production Management 8, nr 1 (31.01.2018): 2–8. http://dx.doi.org/10.32738/jeppm.201801.0002.
Pełny tekst źródła
19
McCormick, Michael E., i Oavid R. B. Kraemer. "Ocean Wave Energy Utilization". Marine Technology Society Journal 36, nr 4 (1.12.2002): 52–58. http://dx.doi.org/10.4031/002533202787908617.
Pełny tekst źródłaStreszczenie:
The exploitation of ocean waves in electricity production, potable-water production, waterbody revitalization and farming is discussed. Those energy-conversion technologies that are now at the prototype stage are described. The systems are those that are resonant in nature, since resonant systems have been found to be the most efficient. The efficiency of these systems is due to both diffraction-induced wave focusing and possible impedance-matching.
20
Cahill, Brendan. "Characterizing Ireland's wave energy resource". Boolean: Snapshots of Doctoral Research at University College Cork, nr 2011 (1.01.2011): 21–25. http://dx.doi.org/10.33178/boolean.2011.5.
Pełny tekst źródłaStreszczenie:
In theory, the energy that could be extracted from the oceans is well in excess of any current, or future, human requirements. While wave energy currently lags behind conventional, carbon based sources of power and other renewable sources of energy such as wind and solar, advances continue to be made. The developers of Wave Energy Converters (WECs), the devices that are designed to harness the power of ocean waves, require methods to compare and evaluate the wave energy resource at different locations in order to allow them to select the most suitable sites to achieve optimal power capture and economic performance from their installations. The focus of my Ph.D. research is towards developing new methods for characterizing the wave energy resource off the west coast of Ireland with reference to the potential power available and the performance of typical devices, and also to allow for the comparison of possible sites ...
21
Ismail, Mohd Arif, Nik Mohd Ridzuan Shaharuddin, Omar Yaakob, Mohamad Hidayat Jamal, Faizul Amri Adnan, Ahmad Hadi Mohamed Rashidi, Wan Ahmad Hafiz Wan Mohd Azhary i in. "WAKE WASH OF A FAST SMALL BOAT IN RESTRICTED WATERS: MODEL TESTS AND FULL-SCALE MEASUREMENTS". Brodogradnja 73, nr 2 (1.03.2022): 93–119. http://dx.doi.org/10.21278/brod73206.
Pełny tekst źródłaStreszczenie:
This paper presents the model testing of an 8.23m boat with hard chine planning hull generated waves at the Kilim recreational park. Wake is considered one of the main causes of riverbank erosion due to the energy carried by waves hitting the riverbank. Initially, ship particulars were measured from actual boats to generate a hull form using MAXSURF software. A lines plan was then generated to fabricate the model using fibreglass. Experiments were conducted in the National Hydraulic Research Institute of Malaysia (NAHRIM) at various speeds at a constant operating draft. The wave patterns generated by the modelled boats at different speeds were recorded for analysis. Wave attenuation for deep water conditions was studied and it was found that the wave exponent, n ranged from -0.36 to -0.75 for all depth Froude number (Fnh) condition. Wave decay analysis was used to estimate wave height for defined water depth. For 11 people with an average mass of 65 kg on board, the produced wave height was greater than the permissible wave wake height of 75 mm. The generated energy exceeded 60 Joules/m for nearly all measured speeds. A boat speed of less than 5 knots was suggested for boats loaded with the maximum passenger limit of 11 people. Other recommendations were made to minimize the wave wake height produced by the modelled boat.
22
Sun, Chongfei, Zirong Luo, Jianzhong Shang, Zhongyue Lu, Yiming Zhu i Guoheng Wu. "Analysis of Wave Energy and Energy Storage Characteristics of Wave Energy Converters". IOP Conference Series: Materials Science and Engineering 394, nr 4 (8.08.2018): 042119. http://dx.doi.org/10.1088/1757-899x/394/4/042119.
Pełny tekst źródła
23
ONO, Koshi, i Ayumi SARUWATARI. "ENERGY BALANCE FOR WAVES AROUND AN OWC WAVE ENERGY CONVERTER". Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)) 72, nr 2 (2016): I_575—I_582. http://dx.doi.org/10.2208/jscejam.72.i_575.
Pełny tekst źródła
24
Mohtat, Ali, Casey Fagley, Kedar C. Chitale i Stefan G. Siegel. "Efficiency analysis of the cycloidal wave energy convertor under real-time dynamic control using a 3D radiation model". International Marine Energy Journal 5, nr 1 (14.06.2022): 45–56. http://dx.doi.org/10.36688/imej.5.45-56.
Pełny tekst źródłaStreszczenie:
Ocean waves provide a vast, uninterrupted resource of renewable energy collocated around large coastal population centers. Clean energy from ocean waves can contribute to the local electrical grid without the need for long-term electrical storage, yet due to the current high cost of energy extraction from ocean waves, there is no commercial ocean wave farm in operation. One of the wave energy converter (WEC) device classes that show the potential to enable economic energy generation from ocean waves is the class of wave terminators. This work investigates the Cycloidal Wave Energy Converter (CycWEC), which is a one-sided, lift-based wave terminator operating with coupled hydrofoils. The energy that the CycWEC extracted from ocean waves was estimated using a control volume analysis model of the 3D wave field in the presence of the CycWEC. The CycWEC was operated under feedback control to extract the maximum amount of energy possible from the incoming waves, and the interaction with different incoming regular, irregular, and short crested waves was examined.
25
Rainey, R. C. T. "Key features of wave energy". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 370, nr 1959 (28.01.2012): 425–38. http://dx.doi.org/10.1098/rsta.2011.0251.
Pełny tekst źródłaStreszczenie:
For a weak point source or dipole, or a small body operating as either, we show that the power from a wave energy converter (WEC) is the product of the particle velocity in the waves, and the wave force (suitably defined). There is a thus a strong analogy with a wind or tidal turbine, where the power is the product of the fluid velocity through the turbine, and the force on it. As a first approximation, the cost of a structure is controlled by the force it has to carry, which governs its strength, and the distance it has to be carried, which governs its size. Thus, WECs are at a disadvantage compared with wind and tidal turbines because the fluid velocities are lower, and hence the forces are higher. On the other hand, the distances involved are lower. As with turbines, the implication is also that a WEC must make the most of its force-carrying ability—ideally, to carry its maximum force all the time, the ‘100% sweating WEC’. It must be able to limit the wave force on it in larger waves, ultimately becoming near-transparent to them in the survival condition—just like a turbine in extreme conditions, which can stop and feather its blades. A turbine of any force rating can achieve its maximum force in low wind speeds, if its diameter is sufficiently large. This is not possible with a simple monopole or dipole WEC, however, because of the ‘ nλ /2 π ’ capture width limits. To achieve reasonable ‘sweating’ in typical wave climates, the force is limited to about 1 MN for a monopole device, or 2 MN for a dipole. The conclusion is that the future of wave energy is in devices that are not simple monopoles or dipoles, but multi-body devices or other shapes equivalent to arrays.
26
Li, Chi-Yu, Ruey-Syan Shih i Wen-Kai Weng. "Investigation of Ocean-Wave-Focusing Characteristics Induced by a Submerged Crescent-Shaped Plate for Long-Crested Waves". Water 12, nr 2 (12.02.2020): 509. http://dx.doi.org/10.3390/w12020509.
Pełny tekst źródłaStreszczenie:
The need for renewable energy has gained importance with growing concerns about climate change. Wave energy has attracted considerable attention owing to its sustainability potential. Reflection, refraction, diffraction, and shoaling of waves occur when waves propagate through a submerged structure. These mechanics, when properly utilized, can be employed to focus waves to a specific location and also to increase wave heights, by which wave energy is usually represented, for planning and designing wave farms. Wave focusing induced by a submerged crescent-shaped plate for different wave conditions, incident wave directions, and submerged depths mainly considering the potential applications of absorber wave-energy converters within the wave farm was investigated experimentally and numerically. All experimental regular wave conditions were controlled to be nonbreaking, and the numerical results were obtained by a 3D model, implemented through the boundary element method based on Airy wave theory. The results show that wave focusing appears behind the plate along the direction of the incident waves, and the locations of focused waves tend to be farther away from the plate for shorter-period waves. The maximum measured wave height can be 3.44 times higher than the incident wave height.
27
Michele, Simone, Federica Buriani, Emiliano Renzi, Marijn van Rooij, Bayu Jayawardhana i Antonis I. Vakis. "Wave Energy Extraction by Flexible Floaters". Energies 13, nr 23 (24.11.2020): 6167. http://dx.doi.org/10.3390/en13236167.
Pełny tekst źródłaStreszczenie:
We present a novel mathematical model to investigate the extraction of wave power by flexible floaters. The model is based on the method of dry modes, coupled with a matched eigenfunction expansion. Our model results compare satisfactorily with preliminary data obtained from a demonstrator device, developed at the University of Groningen. We show that the role of elasticity is to increase the number of resonant frequencies with respect to a rigid body, which has a positive effect on wave power output. The mathematical model is then extended to irregular incident waves, described by a JONSWAP spectrum. Our results show that the peak capture factors decrease in irregular waves, as compared to the monochromatic case. However, the system becomes more efficient at non-resonant frequencies. This work highlights the need to scale-up experimental investigations on flexible wave energy converters, which are still a small minority, compared to those on rigid converters.
28
Re, Carlo, Giorgio Manno, Giuseppe Ciraolo i Giovanni Besio. "Wave Energy Assessment around the Aegadian Islands (Sicily)". Energies 12, nr 3 (22.01.2019): 333. http://dx.doi.org/10.3390/en12030333.
Pełny tekst źródłaStreszczenie:
This paper presents the estimation of the wave energy potential around the Aegadian islands (Italy), carried out on the basis of high resolution wave hindcast. This reanalysis was developed employing Weather Research and Forecast (WRF) and WAVEWATCH III ® models for the modelling of the atmosphere and the waves, respectively. Wave climate has been determined using the above-mentioned 32-year dataset covering the years from 1979 to 2010. To improve the information about wave characteristics regarding spatial details, i.e., increasing wave model resolution, especially in the nearshore region around the islands, a SWAN (Simulating WAves Nearshore) wave propagation model was used. Results obtained through the development of the nearshore analysis detected four energetic hotspots close to the coast of the islands. Near Marettimo island, only one hotspot was detected with a maximum wave energy flux of 9 kW/m, whereas, around Favignana, three hotspots were identified with a maximum wave energy flux of 6.5 kW/m. Such values of available wave energy resource are promising to develop different projects for wave energy converters in specific areas along the coast, in order to improve the energetic independence of Aegadian islands.
29
Folley, Matt, Carwyn Frost i Paul Lamont-Kane. "Innovating to make wave energy viable". EU Research 32, Autumn 2022 (październik 2022): 34–36. http://dx.doi.org/10.56181/phfz2069.
Pełny tekst źródłaStreszczenie:
Developing Innovative Strategies to Extract Ocean Wave Energy, or the LiftWEC project, is exploring the potential of using lift forces generated by ocean waves as a source of power. Principal Researcher, Matt Folley, seeks to finally prove waves can make sense as the next big renewable.
30
Yadav, N., R. Keppens i B. Popescu Braileanu. "3D MHD wave propagation near a coronal null point: New wave mode decomposition approach". Astronomy & Astrophysics 660 (kwiecień 2022): A21. http://dx.doi.org/10.1051/0004-6361/202142688.
Pełny tekst źródłaStreszczenie:
Context. Ubiquitous vortex flows at the solar surface excite magnetohydrodynamic (MHD) waves that propagate to higher layers of the solar atmosphere. In the solar corona, these waves frequently encounter magnetic null points. The interaction of MHD waves with a coronal magnetic null in realistic 3D setups requires an appropriate wave identification method. Aims. We present a new MHD wave decomposition method that overcomes the limitations of existing wave identification methods. Our method allows for an investigation of the energy fluxes in different MHD modes at different locations of the solar atmosphere as waves generated by vortex flows travel through the solar atmosphere and pass near the magnetic null. Methods. We used the open-source MPI-AMRVAC code to simulate wave dynamics through a coronal null configuration. We applied a rotational wave driver at our bottom photospheric boundary to mimic vortex flows at the solar surface. To identify the wave energy fluxes associated with different MHD wave modes, we employed a wave decomposition method that is able to uniquely distinguish different MHD modes. Our proposed method utilizes the geometry of an individual magnetic field-line in the 3D space to separate the velocity perturbations associated with the three fundamental MHD waves. We compared our method with an existing wave decomposition method that uses magnetic flux surfaces instead. Over the selected flux surfaces, we calculated and analyzed the temporally averaged wave energy fluxes, as well as the acoustic and magnetic energy fluxes. Our wave decomposition method allowed us to estimate the relative strengths of individual MHD wave energy fluxes. Results. Our method for wave identification is consistent with previous flux-surface-based methods and provides the expected results in terms of the wave energy fluxes at various locations of the null configuration. We show that ubiquitous vortex flows excite MHD waves that contribute significantly to the Poynting flux in the solar corona. Alfvén wave energy flux accumulates on the fan surface and fast wave energy flux accumulates near the null point. There is a strong current density buildup at the spine and fan surface. Conclusions. The proposed method has advantages over previously utilized wave decomposition methods, since it may be employed in realistic simulations or magnetic extrapolations, as well as in real solar observations whenever the 3D fieldline shape is known. The essential characteristics of MHD wave propagation near a null – such as wave energy flux accumulation and current buildup at specific locations – translate to the more realistic setup presented here. The enhancement in energy flux associated with magneto-acoustic waves near nulls may have important implications in the formation of jets and impulsive plasma flows.
31
Koide, Shinji, Sousuke Noda, Masaaki Takahashi i Yasusada Nambu. "One-dimensional Force-free Numerical Simulations of Alfvén Waves around a Spinning Black String". Astrophysical Journal 928, nr 1 (1.03.2022): 84. http://dx.doi.org/10.3847/1538-4357/ac47f8.
Pełny tekst źródłaStreszczenie:
Abstract We performed one-dimensional force-free magnetodynamic numerical simulations of the propagation of Alfvén waves along magnetic field lines around a spinning black-hole-like object, the Banados–Teitelboim–Zanelli black string, to investigate the dynamic process of wave propagation and energy transport with Alfvén waves. We considered an axisymmetric and stationary magnetosphere and perturbed the background magnetosphere to obtain the linear wave equation for the Alfvén wave mode. The numerical results show that the energy of Alfvén waves monotonically increases as the waves propagate outwardly along the rotating curved magnetic field line around the ergosphere, where energy seems not to be conserved, in the case of energy extraction from the black string by the Blandford–Znajek mechanism. The apparent breakdown of energy conservation suggests the existence of a wave induced by the Alfvén wave. Considering the additional fast magnetosonic wave induced by the Alfvén wave, the energy conservation is confirmed. Similar relativistic phenomena, such as the amplification of Alfvén waves and induction of fast magnetosonic waves, are expected around a spinning black hole.
32
Wang, David W., i Hemantha W. Wijesekera. "Observations of Breaking Waves and Energy Dissipation in Modulated Wave Groups". Journal of Physical Oceanography 48, nr 12 (grudzień 2018): 2937–48. http://dx.doi.org/10.1175/jpo-d-17-0224.1.
Pełny tekst źródłaStreszczenie:
AbstractIt has been recognized that modulated wave groups trigger wave breaking and generate energy dissipation events on the ocean surface. Quantitative examination of wave-breaking events and associated turbulent kinetic energy (TKE) dissipation rates within a modulated wave group in the open ocean is not a trivial task. To address this challenging topic, a set of laboratory experiments was carried out in an outdoor facility, the Oil and Hazardous Material Simulated Environment Test Tank (203 m long, 20 m wide, 3.5 m deep). TKE dissipation rates at multiple depths were estimated directly while moving the sensor platform at a speed of about 0.53 m s−1 toward incoming wave groups generated by the wave maker. The largest TKE dissipation rates and significant whitecaps were found at or near the center of wave groups where steepening waves approached the geometric limit of waves. The TKE dissipation rate was O(10−2) W kg−1 during wave breaking, which is two to three orders of magnitude larger than before and after wave breaking. The enhanced TKE dissipation rate was limited to a layer of half the wave height in depth. Observations indicate that the impact of wave breaking was not significant at depths deeper than one wave height from the surface. The TKE dissipation rate of breaking waves within wave groups can be parameterized by local wave phase speed with a proportionality breaking strength coefficient dependent on local steepness. The characterization of energy dissipation in wave groups from local wave properties will enable a better determination of near-surface TKE dissipation of breaking waves.
33
Li, Yaokun, Jiping Chao i Yanyan Kang. "Variations in Wave Energy and Amplitudes along the Ray Paths of Barotropic Rossby Waves in Horizontally Non-Uniform Basic Flows". Atmosphere 12, nr 4 (5.04.2021): 458. http://dx.doi.org/10.3390/atmos12040458.
Pełny tekst źródłaStreszczenie:
A non-divergent barotropic model on a sphere transformed to Mercator coordinates is used to examine the variations in wave energy and amplitude along the energy dispersion paths of barotropic Rossby waves in non-uniform basic flows. Wave energy can be easily solved by specifying the divergence of the group velocity along the corresponding rays. In an analytical non-uniform basic flow that represents the basic features of the observed one at middle latitudes, waves with different periods decay accompanying the decreases in wave energy and amplitude and the increase in the total wavenumber. This implies that the waves are trapped and the energy is eventually absorbed by the basic flow. For the observed non-uniform basic flow that can represent the basic features of the non-divergent wind field at 200 hPa, the situation is more complicated. The significant increase in wave energy can be caused by either the convergence of wave energy or the barotropic energy absorption from the basic flow or both of them. A significant increase in amplitude can also be observed if the total wavenumber varies moderately. This means waves can significantly develop. Waves may decay if both wave energy and amplitude decrease. Waves may propagate without significant developing or decaying to realize a long distance propagation. The propagating waves are mainly caused by oscillating wave energy as well as amplitude.
34
Falnes, Johannes, i Adi Kurniawan. "Fundamental formulae for wave-energy conversion". Royal Society Open Science 2, nr 3 (marzec 2015): 140305. http://dx.doi.org/10.1098/rsos.140305.
Pełny tekst źródłaStreszczenie:
The time-average wave power that is absorbed from an incident wave by means of a wave-energy conversion (WEC) unit, or by an array of WEC units—i.e. oscillating immersed bodies and/or oscillating water columns (OWCs)—may be mathematically expressed in terms of the WEC units' complex oscillation amplitudes, or in terms of the generated outgoing (diffracted plus radiated) waves, or alternatively, in terms of the radiated waves alone. Following recent controversy, the corresponding three optional expressions are derived, compared and discussed in this paper. They all provide the correct time-average absorbed power. However, only the first-mentioned expression is applicable to quantify the instantaneous absorbed wave power and the associated reactive power. In this connection, new formulae are derived that relate the ‘added-mass’ matrix, as well as a couple of additional reactive radiation-parameter matrices, to the difference between kinetic energy and potential energy in the water surrounding the immersed oscillating WEC array. Further, a complex collective oscillation amplitude is introduced, which makes it possible to derive, by a very simple algebraic method, various simple expressions for the maximum time-average wave power that may be absorbed by the WEC array. The real-valued time-average absorbed power is illustrated as an axisymmetric paraboloid defined on the complex collective-amplitude plane. This is a simple illustration of the so-called ‘fundamental theorem for wave power’. Finally, the paper also presents a new derivation that extends a recently published result on the direction-average maximum absorbed wave power to cases where the WEC array's radiation damping matrix may be singular and where the WEC array may contain OWCs in addition to oscillating bodies.
35
Bailey, Taylor, Lauren Ross, Mary Bryant i Duncan Bryant. "Predicting Wind Wave Suppression on Irregular Long Waves". Journal of Marine Science and Engineering 8, nr 8 (18.08.2020): 619. http://dx.doi.org/10.3390/jmse8080619.
Pełny tekst źródłaStreszczenie:
The applicability of the wind wave suppression model developed by Chen and Belcher (2000) to irregular wave environments is investigated in this study. Monochromatic and irregular wave environments were simulated in the W2 (Wind/Wave) laboratory at the University of Maine under varying wind speeds. The Chen and Belcher (2000) model accurately predicts the reduction of the energy density of the wind waves in the presence of the monochromatic waves as a function of wave steepness, but under predicts this energy dissipation for the irregular waves. This is due to the consideration of a single wave frequency in the estimation of the growth rate and wave-induced stress of the monochromatic waves. The same formulations for the growth rate and wave-induced stress cannot be applied to irregular waves because their spectra contain energy over a wide range of frequencies. A revised version of the model is proposed to account for the energy contained within multiple wave frequencies from the power spectra for the mechanically generated irregular waves. The revised model shows improved results when applied to irregular wave environments.
36
Eden, Carsten, Manita Chouksey i Dirk Olbers. "Mixed Rossby–Gravity Wave–Wave Interactions". Journal of Physical Oceanography 49, nr 1 (styczeń 2019): 291–308. http://dx.doi.org/10.1175/jpo-d-18-0074.1.
Pełny tekst źródłaStreszczenie:
AbstractMixed triad wave–wave interactions between Rossby and gravity waves are analytically derived using the kinetic equation for models of different complexity. Two examples are considered: initially vanishing linear gravity wave energy in the presence of a fully developed Rossby wave field and the reversed case of initially vanishing linear Rossby wave energy in the presence of a realistic gravity wave field. The kinetic equation in both cases is numerically evaluated, for which energy is conserved within numerical precision. The results are validated by a corresponding ensemble of numerical model simulations supporting the validity of the weak-interaction assumption necessary to derive the kinetic equation. Since they are generated by nonresonant interactions only, the energy transfers toward the respective linear wave mode with vanishing energy are small in both cases. The total generation of energy of the linear gravity wave mode in the first case scales to leading order as the square of the Rossby number in agreement with independent estimates from laboratory experiments, although a part of the linear gravity wave mode is slaved to the Rossby wave mode without wavelike temporal behavior.
37
Tang, Shanran, Yiqin Yang i Liangsheng Zhu. "Directing Shallow-Water Waves Using Fixed Varying Bathymetry Designed by Recurrent Neural Networks". Water 15, nr 13 (29.06.2023): 2414. http://dx.doi.org/10.3390/w15132414.
Pełny tekst źródłaStreszczenie:
Directing shallow-water waves and their energy is highly desired in many ocean engineering applications. Coastal infrastructures can be protected by reflecting shallow-water waves to deep water. Wave energy harvesting efficiency can be improved by focusing shallow-water waves on wave energy converters. Changing water depth can effectively affect wave celerity and therefore the propagation of shallow-water waves. However, determining spatially varying bathymetry that can direct shallow-water waves to a designed location is not trivial. In this paper, we propose a novel machine learning method to design and optimize spatially varying bathymetry for directing shallow-water waves, in which the bathymetry is assumed fixed in time without considering morphodynamics. Shallow-water wave theory was applied to establish the mapping between water wave mechanics and recurrent neural networks (RNNs). Two wave-equivalent RNNs were developed to model shallow-water waves over fixed varying bathymetry. The resulting RNNs were trained to optimize bathymetry for wave energy focusing. We demonstrate that the bathymetry optimized by the wave-equivalent RNNs can effectively reflect and refract wave energy to various designed locations. We also foresee the potential that new engineering tools can be similarly developed based on the mathematical equivalence between wave mechanics and recurrent neural networks.
38
Falnes, Johannes, i Jørgen Løvseth. "Ocean wave energy". Energy Policy 19, nr 8 (październik 1991): 768–75. http://dx.doi.org/10.1016/0301-4215(91)90046-q.
Pełny tekst źródła
39
De Silva, Kalpa, Paul Foster, Antoine Guilcher, Asela Bandara, Roy Jogiya, Tim Lockie, Phil Chowiencyzk i in. "Coronary Wave Energy". Circulation: Cardiovascular Interventions 6, nr 2 (kwiecień 2013): 166–75. http://dx.doi.org/10.1161/circinterventions.112.973081.
Pełny tekst źródła
40
Li, B., i M. Phillips. "South West wave energy hub: coastal impact and wave energy". Proceedings of the Institution of Civil Engineers - Energy 163, nr 1 (luty 2010): 17–29. http://dx.doi.org/10.1680/ener.2010.163.1.17.
Pełny tekst źródła
41
Kaihatu, James, i Hoda M. El Safty. "SPECTRAL DESCRIPTION OF ENERGY DISSIPATION IN BREAKING WAVE GROUPS". Coastal Engineering Proceedings 1, nr 32 (2.02.2011): 19. http://dx.doi.org/10.9753/icce.v32.waves.19.
Pełny tekst źródłaStreszczenie:
The dissipation characteristics of laboratory breaking wave groups and random waves are studied. A time-domain eddy viscosity model is used to represent the breaking wave, and the instantaneous dissipation time series deduced from measurements of free surface elevation. Fourier series of these time series yields the dissipation rate as a function of frequency, the frequency dependence of which has been shown to be the inverse of that of the spectral density of free surface elevation for random waves. It is shown that the inverse relationship between the dissipation rate and the free surface spectral density does not appear to hold for wave groups, likely due to the presence of generated long waves in the dissipation time series. These long waves introduce a periodicity into the dissipation time series and inhibit any true randomness from developing. The overall bulk dissipation is calculated from the dissipation rate for both the wave groups and random waves. It appears that, overall, the wave groups undergo a greater degree of dissipation than equivalent random waves.
42
Tang, Huai-Gu, Bing-Shou He i Hai-Bo Mou. "P- and S-wave energy flux density vectors". GEOPHYSICS 81, nr 6 (listopad 2016): T357—T368. http://dx.doi.org/10.1190/geo2016-0245.1.
Pełny tekst źródłaStreszczenie:
The conventional energy flux density vector indicates the propagation direction of mixed P- and S-wave wavefields, which means when a wavefront of P-wave encounters a wavefront of S-wave with different propagation directions, the vectors cannot indicate both directions accurately. To avoid inaccuracies caused by superposition of P- and S-waves in a conventional energy flux density vector, P- and S-wave energy flux density vectors should be calculated separately. Because the conventional energy flux density vector is obtained by multiplying the stress tensor by the particle-velocity vector, the common way to calculate P- and S-wave energy flux density vectors is to decompose the stress tensor and particle-velocity vector into the P- and S-wave parts before multiplication. However, we have found that the P-wave still interfere with the S-wave energy flux density vector calculated by this method. Therefore, we have developed a new method to calculate P- and S-wave energy flux density vectors based on a set of new equations but not velocity-stress equations. First, we decompose elastic wavefield by the set of equations to obtain the P- and S-wave particle-velocity vectors, dilatation scalar, and rotation vector. Then, we calculate the P-wave energy flux density vector by multiplying the P-wave particle-velocity vector by dilatation scalar, and we calculate the S-wave energy flux density vector as a cross product of the S-wave particle-velocity vector and rotation vector. The vectors can indicate accurate propagation directions of P- and S-waves, respectively, without being interfered by the superposition of the two wave modes.
43
Hafsa, Bouhrim, El Marjani Abdellatif i Hamid Mounir. "Wave generation in an OWC system for wave energy conversion". MATEC Web of Conferences 307 (2020): 01012. http://dx.doi.org/10.1051/matecconf/202030701012.
Pełny tekst źródłaStreszczenie:
This paper aims to present an overview on the wavemakers used to generate waves inside a numerical wave tank taking into consideration the biphasic air-water aspect of the incident wave. Wave markers are used to simulate the flow dynamic behaviour in the Oscillating Water Column (OWC) for wave energy conversion. Three kinds of these systems have been considered in the present work. To compare these types of wave generators a case study was adopted with the assumption of a fluid flow which is unsteady, 2D, biphasic (air-water), and k-epsilon turbulent. It has been found that the piston and the flap wave maker types are suitable for OWC device simulations.
44
Foyhirun, Chutipat, Duangrudee Kositgittiwong i Chaiwat Ekkawatpanit. "Wave Energy Potential and Simulation on the Andaman Sea Coast of Thailand". Sustainability 12, nr 9 (1.05.2020): 3657. http://dx.doi.org/10.3390/su12093657.
Pełny tekst źródłaStreszczenie:
Ocean wave energy is an interesting renewable energy because it will never run out and can be available all the time. If the wave energy is to be used, then the feasibility study of localized wave potential has to be studied. This goal is to study the potential of waves in the Andaman Sea. The Simulating WAves Nearshore (SWAN) model was used to calculate the significant wave heights, which were validated with the measurement data of the Jason-2 satellite. The coastal area of Phuket and Phang Nga provinces are suitable locations for studying wave energy converters because they have high significant wave height. Moreover, this study used computational fluid dynamics (CFD) for the simulation of wave behavior in accordance with wave parameters from the SWAN model. The wave height simulated from CFD was validated with linear wave theory. The results found that it was in good agreement with linear wave theory. It can be applied for a simulation of the wave energy converter.
45
Walker, A. D. M. "Energy exchange and wave action conservation for magnetohydrodynamic (MHD) waves in a general, slowly varying medium". Annales Geophysicae 32, nr 12 (9.12.2014): 1495–510. http://dx.doi.org/10.5194/angeo-32-1495-2014.
Pełny tekst źródłaStreszczenie:
Abstract. Magnetohydrodynamic (MHD) waves in the solar wind and magnetosphere are propagated in a medium whose velocity is comparable to or greater than the wave velocity and which varies in both space and time. In the approximation where the scales of the time and space variation are long compared with the period and wavelength, the ray-tracing equations can be generalized and then include an additional first-order differential equation that determines the variation of frequency. In such circumstances the wave can exchange energy with the background: wave energy is not conserved. In such processes the wave action theorem shows that the wave action, defined as the ratio of the wave energy to the frequency in the local rest frame, is conserved. In this paper we discuss ray-tracing techniques and the energy exchange relation for MHD waves. We then provide a unified account of how to deal with energy transport by MHD waves in non-uniform media. The wave action theorem is derived directly from the basic MHD equations for sound waves, transverse Alfvén waves, and the fast and slow magnetosonic waves. The techniques described are applied to a number of illustrative cases. These include a sound wave in a medium undergoing a uniform compression, an isotropic Alfvén wave in a steady-state shear layer, and a transverse Alfvén wave in a simple model of the magnetotail undergoing compression. In each case the nature and magnitude of the energy exchange between wave and background is found.
46
Jiang, Xingjie, Dalu Gao, Feng Hua, Yongzeng Yang i Zeyu Wang. "An Improved Approach to Wave Energy Resource Characterization for Sea States with Multiple Wave Systems". Journal of Marine Science and Engineering 10, nr 10 (23.09.2022): 1362. http://dx.doi.org/10.3390/jmse10101362.
Pełny tekst źródłaStreszczenie:
Generally, wave energy resource assessment and characterization are performed based on an entire wave spectrum, ignoring the detailed energy features that belong to wave systems, i.e., wind waves and swells. In reality, the energy is separately possessed by multiple wave systems, propagating at different directions and velocities. Therefore, it is the wave system that is the most fundamental unit of the wave energy resource. Although detailed analyses of wind waves and swells can be conducted via wave system partitioning, operational assessment methods that can reveal the detailed wave energy characteristics of wave systems still deserve further development. Following a two-step partitioning procedure, this paper presents an improved approach to the characterization of wave energy resources based on grouped wave systems. Wave systems classified as the same group are consistent in terms of propagation direction, velocity, and other characteristics of wave energy, but these characteristics between the groups are obviously different. Therefore, in comparison with the traditional method, the new approach can reveal more comprehensive and more detailed characteristics of the wave energy resource in terms of (i) wind-sea and swell components, (ii) directionality, and (iii) wave conditions; details that represent valuable information for the improvement of the performance of wave energy converter devices and the optimization of the layout of device arrays in wave farms.
47
KOTAKE, Shigeo, Hidenori UCHIDA i Yasuyuki SUZUKI. "C110 MECHANISM AND EFFICIENCY OF POWER GENERATION FROM ACCUMULATING SPREAD-COHERENT ENERGY : APPLICATION OF WAVE ALGORITHM(Solar, Wind and Wave Energy-3)". Proceedings of the International Conference on Power Engineering (ICOPE) 2009.1 (2009): _1–183_—_1–187_. http://dx.doi.org/10.1299/jsmeicope.2009.1._1-183_.
Pełny tekst źródła
48
Ji, Zhifei, Xiaodong Yuan, Min Lin i Jianyu Fan. "Hydrodynamic Analysis of 3-SPS Wave Energy Conversion Device". E3S Web of Conferences 271 (2021): 01013. http://dx.doi.org/10.1051/e3sconf/202127101013.
Pełny tekst źródłaStreszczenie:
Wave energy has the advantages of high energy density, renewability, and wide distribution, and has been highly valued by many coastal countries. The wave energy conversion device can convert wave energy into electric energy, which is of great significance for alleviating problems such as energy crisis and greenhouse effect. The traditional wave energy conversion device can only gain the energy along the heave direction, and the kinetic energy of the buoy is not fully utilized. To improve the energy utilization efficiency of the wave energy conversion device, this paper proposed a new type of 3-SPS wave energy conversion device. Based on linear waves and Lagrangian equation, a hydrodynamic model of the device was established. The displacement and velocity of the device float under the action of linear waves were analyzed. The results show that the 3-SPS wave energy conversion device can collect the kinetic energy of the buoy in its heaving, surging and pitching movement at the same time; the kinetic energy of the buoy in the heaving direction is much greater than the kinetic energy in the surging and pitching directions; the buoy can capture kinetic energy in multiple directions of motion, indicating that the 3-SPS wave energy conversion device has a high energy utilization efficiency. This paper provides some useful references for the optimal design of the new wave energy device.
49
Göteman, Malin, Cameron McNatt, Marianna Giassi, Jens Engström i Jan Isberg. "Arrays of Point-Absorbing Wave Energy Converters in Short-Crested Irregular Waves". Energies 11, nr 4 (17.04.2018): 964. http://dx.doi.org/10.3390/en11040964.
Pełny tekst źródłaStreszczenie:
For most wave energy technology concepts, large-scale electricity production and cost-efficiency require that the devices are installed together in parks. The hydrodynamical interactions between the devices will affect the total performance of the park, and the optimization of the park layout and other park design parameters is a topic of active research. Most studies have considered wave energy parks in long-crested, unidirectional waves. However, real ocean waves can be short-crested, with waves propagating simultaneously in several directions, and some studies have indicated that the wave energy park performance might change in short-crested waves. Here, theory for short-crested waves is integrated in an analytical multiple scattering method, and used to evaluate wave energy park performance in irregular, short-crested waves with different number of wave directions and directional spreading parameters. The results show that the energy absorption is comparable to the situation in long-crested waves, but that the power fluctuations are significantly lower.
50
Thaha, Muhammad Arsyad, P. H. Mukhsan, A. M. Subhan i A. Ildha Dwipuspita. "Single Slope Shore Protection as a Wave Energy Catcher". MATEC Web of Conferences 203 (2018): 01008. http://dx.doi.org/10.1051/matecconf/201820301008.
Pełny tekst źródłaStreszczenie:
Wave energy is being increasingly regarded in many countries as a major, promising and renewable resource. This paper presents the development of slope coastal protection as a wave energy converter by capturing sea water into the reservoir through overtopping process. Physical models simulation were conducted at The Laboratory of Coastal Engineering, Hasanuddin University. A model of 30 cm x 90 cm in the 30° degree of slope made from acrylic material equipped with a reservoir at the top surface of the structures to catch seawater through run up and overtopping. Models were simulated with various wave high and periods as well as high of freeboard. The results showed that the overtopping discharge (Q) much influenced by relative freeboard height (Fb/d), wave steepness (Hi/L), reflected waves (Kr) and the number of standing waves (Nsw). The increasing Fb, the decreasing Q; the increasing wave steepness, the increasing overtopping discharge. It was found that the larger the reflection coefficient, the greater the discharge overtopping. Standing waves in front of the structure due to the superposition of the incident wave and reflection waves also contribute to enlarge the overtopping discharge.