scholarly journals Moment of Wave Energy Model in Water of Finite Depth

2020 ◽  
Vol 9 (3) ◽  
pp. 1762-1766
Keyword(s):  
Mathematical Model ◽  
Wave Field ◽  
Wave Energy ◽  
Continuous Flow ◽  
Electrical Energy ◽  
Finite Depth ◽  
Energy Model ◽  
Energy Device ◽  
Cylindrical Structure ◽  
Diffraction Wave

In this work, we have consider a particular wave energy device to create electrical energy in water. The device contains a submerged cylindrical obstacle placed above a plate which is also assume as a cylindrical structure. Also the diffracted potentials are derived by applying several mathematical model for each region of the fluid. Due to continuous flow of the fluid, we have introduce a system of equation for some unknown constants which are involve in potentials expression. Finally, we derived moment of the device due to diffraction wave field and present graphically.

scholarly journals Moment of Wave Energy Model in Water of Finite Depth

2020 ◽  
Vol 8 (5) ◽  
pp. 2781-2785
Keyword(s):  
Mathematical Models ◽  
Wave Field ◽  
Wave Energy ◽  
Continuous Flow ◽  
Electrical Energy ◽  
Finite Depth ◽  
Energy Model ◽  
Energy Device ◽  
Cylindrical Structure ◽  
Diffraction Wave

In this work, we have considered a particular wave energy device to create electrical energy in water. The device contains a submerged cylindrical obstacle placed above a plate which is also assumed as a cylindrical structure. Also the diffracted potentials are derived by applying several mathematical models for each region of the fluid. Due to continuous flow of the fluid, we have introduced a system of equation for some unknown constants which are involved in potentials expression. Finally, we derived moment of the device due to diffraction wave field and present graphically.

scholarly journals From Bore–Soliton–Splash to a New Wave-to-Wire Wave-Energy Model

Water Waves ◽  
2019 ◽  
Vol 1 (2) ◽  
pp. 217-258
Author(s):  
O. Bokhove ◽  
A. Kalogirou ◽  
W. Zweers
Keyword(s):  
Wave Energy ◽  
Water Wave ◽  
Weak Sense ◽  
Energy Model ◽  
Energy Device ◽  
Element Space ◽  
Experimental Proof ◽  
Wave Amplification ◽  
Time Discretisation ◽  
Correct Energy

AbstractWe explore extreme nonlinear water-wave amplification in a contraction or, analogously, wave amplification in crossing seas. The latter case can lead to extreme or rogue-wave formation at sea. First, amplification of a solitary-water-wave compound running into a contraction is disseminated experimentally in a wave tank. Maximum amplification in our bore–soliton–splash observed is circa tenfold. Subsequently, we summarise some nonlinear and numerical modelling approaches, validated for amplifying, contracting waves. These amplification phenomena observed have led us to develop a novel wave-energy device with wave amplification in a contraction used to enhance wave-activated buoy motion and magnetically induced energy generation. An experimental proof-of-principle shows that our wave-energy device works. Most importantly, we develop a novel wave-to-wire mathematical model of the combined wave hydrodynamics, wave-activated buoy motion and electric power generation by magnetic induction, from first principles, satisfying one grand variational principle in its conservative limit. Wave and buoy dynamics are coupled via a Lagrange multiplier, which boundary value at the waterline is in a subtle way solved explicitly by imposing incompressibility in a weak sense. Dissipative features, such as electrical wire resistance and nonlinear LED loads, are added a posteriori. New is also the intricate and compatible finite-element space–time discretisation of the linearised dynamics, guaranteeing numerical stability and the correct energy transfer between the three subsystems. Preliminary simulations of our simplified and linearised wave-energy model are encouraging and involve a first study of the resonant behaviour and parameter dependence of the device.

Surface-wave propagation over sinusoidally varying topography

1984 ◽  
Vol 144 ◽  
pp. 419-443 ◽  
Author(s):  
A. G. Davies ◽  
A. D. Heathershaw
Keyword(s):  
Reflection Coefficient ◽  
Surface Waves ◽  
Wave Field ◽  
Incident Wave ◽  
Wave Energy ◽  
Bottom Topography ◽  
Finite Depth ◽  
Linear Perturbation ◽  
Linear Perturbation Theory ◽  
Incident Wave Energy

Surface waves travelling in water of finite depth may be scattered by a region of undulating bottom topography. The present study is concerned with the idealized two-dimensional situation in which long-crested surface waves are incident upon a patch of long-crested regular bottom ripples. The principal question examined concerns the amount of incident wave energy that is reflected by the ripple patch. Linear perturbation theory is used to show that the reflection coefficient is both oscillatory in the quotient of the length of the patch and the surface wavelength, and also strongly dependent upon the quotient of the surface and bed wavelengths. In particular, there is a Bragg resonance between the surface waves and the ripples, which is associated with the reflection of incident wave energy. A secondary question concerns the nature of the wave field in the immediate vicinity of the ripple patch. In resonant cases, it is shown how the partially standing wave on the upwave side of the ripple patch gives way, in an almost linear manner over the patch itself, to a progressive transmitted wave on the downwave side. The theoretical predictions are compared with an extensive set of laboratory observations made in a wave tank. Comparisons relating both to the reflection coefficient, and also to the wave field over the ripple patch, are shown to give consistently good agreement. Finally, the implications of the results for sediment transport on an erodible bed are examined.

scholarly journals Experimental Validation of a Gyroscope Wave Energy Converter for Autonomous Underwater Vehicles

2021 ◽  
Vol 11 (23) ◽  
pp. 11115
Author(s):  
Zhongcai Pei ◽  
Hao Jing ◽  
Zhiyong Tang ◽  
Yulan Fu
Keyword(s):  
Mathematical Model ◽  
Power Generation ◽  
Energy Conversion ◽  
Wave Energy ◽  
Autonomous Underwater Vehicles ◽  
Electrical Energy ◽  
Underwater Vehicles ◽  
Energy Output ◽  
Floating Body ◽  
Power Generation Device

Power technology has long been the main problem that has plagued the realization of ocean exploration by autonomous underwater vehicles (AUVs). This paper introduces a new wave energy conversion device for AUV, which is sealed inside a closed floating body to avoid interaction with the marine environment. The system uses the gyroscopic effect to continuously convert the pitching motion of waves into electrical energy through flywheel rotation, and thus theoretically extend the endurance time of AUVs. In this paper, a mathematical model of the power generation device is established, and the effects caused by different parameters on the system behavior and energy output are analyzed. In order to reduce the cost of experiments, the energy conversion device is installed on an experimental platform that can simulate wave motion to observe its energy generation performance. The experimental results show that the established mathematical model can accurately reflect the real behavior of the power generation device on the platform under different wave conditions, and the energy output error is only 9.91%.

EXPERIMENTAL STUDIES OF CAR PROPERTIES ON A PHYSICAL MODEL

2019 ◽  
pp. 10-16
Author(s):  
Oleksii Timkov ◽  
Dmytro Yashchenko ◽  
Volodymyr Bosenko
Keyword(s):  
Mathematical Model ◽  
Remote Control ◽  
Physical Model ◽  
Model Experiment ◽  
Experimental Studies ◽  
Electrical Energy ◽  
Short Term ◽  
Motor Current ◽  
Memory Card ◽  
The Mathematical Model

The article deals with the development of a physical model of a car equipped with measuring, recording and remote control equipment for experimental study of car properties. A detailed description of the design of the physical model and of the electronic modules used is given, links to application libraries and the code of the first part of the program for remote control of the model are given. Atmega microcontroller on the Arduino Uno platform was used to manage the model and register the parameters. When moving the car on the memory card saved such parameters as speed, voltage on the motor, current on the motor, the angle of the steered wheel, acceleration along three coordinate axes are recorded. Use of more powerful microcontrollers will allow to expand the list of the registered parameters of movement of the car. It is possible to measure the forces acting on the elements of the car and other parameters. In the future, it is planned to develop a mathematical model of motion of the car and check its adequacy in conducting experimental studies on maneuverability on the physical model. In addition, it is possible to conduct studies of stability and consumption of electrical energy. The physical model allows to quickly change geometric dimensions and mass parameters. In the study of highway trains, this approach will allow to investigate the various layout schemes of highway trains in the short term. It is possible to make two-axle road trains and saddle towed trains, three-way hitched trains of different layout. The results obtained will allow us to improve not only the mathematical model, but also the experimental physical model, and move on to further study the properties of hybrid road trains with an active trailer link. This approach allows to reduce material and time costs when researching the properties of cars and road trains. Keywords: car, physical model, experiment, road trains, sensor, remote control, maneuverability, stability.

scholarly journals HF Radars for Wave Energy Resource Assessment Offshore NW Spain

2021 ◽  
Vol 13 (11) ◽  
pp. 2070
Author(s):  
Ana Basañez ◽  
Vicente Pérez-Muñuzuri
Keyword(s):  
Wave Energy ◽  
Numerical Models ◽  
Wave Spectrum ◽  
Energy Resource ◽  
Electrical Energy ◽  
Resource Assessment ◽  
Electricity Production ◽  
Statistical Validation ◽  
Wave Energy Converters ◽  
Energy Converters

Wave energy resource assessment is crucial for the development of the marine renewable industry. High-frequency radars (HF radars) have been demonstrated to be a useful wave measuring tool. Therefore, in this work, we evaluated the accuracy of two CODAR Seasonde HF radars for describing the wave energy resource of two offshore areas in the west Galician coast, Spain (Vilán and Silleiro capes). The resulting wave characterization was used to estimate the electricity production of two wave energy converters. Results were validated against wave data from two buoys and two numerical models (SIMAR, (Marine Simulation) and WaveWatch III). The statistical validation revealed that the radar of Silleiro cape significantly overestimates the wave power, mainly due to a large overestimation of the wave energy period. The effect of the radars’ data loss during low wave energy periods on the mean wave energy is partially compensated with the overestimation of wave height and energy period. The theoretical electrical energy production of the wave energy converters was also affected by these differences. Energy period estimation was found to be highly conditioned to the unimodal interpretation of the wave spectrum, and it is expected that new releases of the radar software will be able to characterize different sea states independently.

The cylindrical wave field of wave energy converters

2013 ◽  
Vol 3-4 ◽  
pp. e26-e39 ◽  
Author(s):  
J. Cameron McNatt ◽  
Vengatesan Venugopal ◽  
David Forehand
Keyword(s):  
Wave Field ◽  
Wave Energy ◽  
Cylindrical Wave ◽  
Wave Energy Converters ◽  
Energy Converters

scholarly journals Study of wave field estimate by using wave energy on reef with steep slope

2012 ◽  
Vol 68 (2) ◽  
pp. I_51-I_55
Author(s):  
Tsunehiro SEKIMOTO ◽  
Sayaka NAKAJIMA ◽  
Hiroyuki KATAYAMA ◽  
Kenya TAKAHASHI
Keyword(s):  
Wave Field ◽  
Wave Energy ◽  
Steep Slope ◽  
Field Estimate
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