Our numerical simulations of tidal flow of a stratified fluid over periodic knife-edge ridges and random topography reveal that the time-averaged tidal energy converted into internal gravity wave radiation arises only from the section of a ridge above a virtual seafloor. The average radiated power is approximated by the power predicted by linear theory if the height of the ridge is measured rel...

This research focusses on the conversion process from mechanical wave energy to electrical energy using an innovative approach with Dielectric Electro Active Polymers (DEAP). These materials have shown great potential as deformable electromechanical actuator devices, however, the generator mode is unexplored yet. Such a deformable DEAP structure could offer distinctive advantages in wave energy...

Generating power is of great importance in today’s world. Due to the pending exhaustion of fossil fuels and to their environmental impact it is crucial to develop clean renewable energy sources. Ocean energy is one of the candidates being a huge, yet unexploited renewable energy source on our planet. Preliminary surveys show that marine power has a potential to supply a significant part of the ...

To develop novel wave energy conversion devices (WECDs) with excellent performance, the relative height and pressure in chambers of square curved oscillating water column (OWC) WECDs were compared through physical model tests, effects regular incident factors, opening length, width, chamber volume on aerodynamic performance capture efficiency (WECE) investigated. The results indicated good for ...

By means of a 3D numerical code we investigate the response of magnetic flux tubes to transverse perturbations. Various tubes with plasma β ranging from 0.1 to 10 embedded in a uniform nonmagnetic atmosphere are considered. High spatial resolution was obtained by the application of a multiple nested grid strategy. Various kinds of internal longitudinal and transverse body waves as well as surfa...

We consider the problem of computing the global response of a tokamak to RF-antenna driving, including conversion at the ion-hybrid resonance layer. The tokamak is modeled as a 2-D circular cavity (a poloidal cross-section). An antenna launches a family of magnetosonic (MS) rays. The amplitude and phase of the MS wave eld are transported using eikonal techniques: the phase is transported using ...

Fossil Fuels are always considered as environmental pollutants. On the other hand, the political and economic situations highly affect the price of these fuels. Offshore wind and wave, as renewable energy sources, represent the better alternatives for electricity generation. Therefore, it is necessary that wind speeds effectively be estimated due to the absence of field measurements of the wind...

in this paper, a two-dimensional reynolds averaged navier-stokes (rans) model is developed to simulate the shoaling, breaking and overtopping of a solitary wave over a vertical breakwater. turbulence intensity is described by using a k turbulence closure model and the free surface configuration is tracked by volume of fluid (vof) technique. to validate the numerical model the simulation result...

In order to correctly predict and evaluate the response of wave energy converters (WECs), an accurate representation of wave climate resource is crucial. This paper gives an overview of wave resource modeling techniques and applies a methodology to estimate the naturally available and technically recoverable resource in a given deployment site. The methodology was initially developed by the Ele...