Wave energy technology is currently growing and gaining popularity. With around 100 separate technologies researched globally in over 25 countries wave energy are believed to soon be able to compete with other renewable sources such as wind energy. One of the new technologies is WaveTube; a wave energy converter currently under development and in need of technical verification. The basic idea of WaveTube is a partially submerged container with an enclosed fresh water volume. The kinetic energy of the ocean waves are transferred onto the floating container, creating an inner flow in the structure and electricity is generated as the fresh water flows through turbines.Previous small-scale model tests have confirmed the basic idea of WaveTube and an inherent continuation is visualizing and evaluating the inner flow using Computational Fluid Dynamics. A simplified 2D simulation where the WaveTube structure is subject to a pure sinusoidal, rotational motion was believed to be able to give useful information about the inner flow field. However, this Master Thesis project shows that a simulation using ANSYS Fluent of this case is not a successful approach. With inner moving parts a so called dynamic mesh was required, which updates the mesh as the boundaries move. In order for this method to be successful the mesh needs to be of high quality. However, for the complex geometry that WaveTube is no mesh was found to meet the requirements and the calculations using the Volume of Fluid method were not able to proceed.

/pdf/analysis-of-the-inner-flow-in-the-wave-energy-converter-3eve6o3cil.pdf

Analysis of the Inner Flow in the Wave Energy Converter WaveTube

Marine structures are usually designed to operate in a wave environment. Structural loading of the body surface under the water and unsteady motions of the body are two of the principal resulting problems. A body in waves is also acted upon by steady forces and moments due to the reflection of the wave energy and as a consequence, the body starts drifting, depending on the rigidity of the constraint. The drift loads on marine structures are important in designing mooring or dynamic positioning devices. The most general way to compute these steady loads is the application of the pressure integration around the wetted surface of the body. An exact solution for the computation of second-order drift forces and moments for arbitrary bodies are presented using a non-singular boundaryintegral equation method (NBIEM) and the application of B-spline to model the wetted body surface in wave. The influences of radiation velocity potentials on drift loads are investigated for different types of bodies.

/pdf/the-effect-of-the-wave-radiation-on-the-second-order-steady-kdagwofec8.pdf

The effect of the wave radiation on the second-order steady loads for arbitrary bodies

A numerical scheme based on the boundaryintegral equation method is developed to obtain the motion of floating bodies in time harmonic waves. It is assumed that the fluid is homogeneous, inviscid and incompressible, the flow is irrotational and the motionsare small. Theapproachhas been to formulatetheassociated problems with the motion of floating bodies in time harmonic waves as integral equations, modify the kernels of the integral equations to make them non-singular, discretize the integral equations using the Gaussian quadratureformula, solve the systems of linear complex algebraic equations for the velocity potentials and find the hydrodynamic characteristics regarding the motion of the body. The computations were performed on a hemisphere, two semi-spheroids, and a circular cylinder. The nondimensional parameters of each mode of motion of the floating bodies in regular waves were calculated and presented in graphical form.

/pdf/motions-of-floating-bodies-in-time-harmonicwaves-2y1wcxsj7r.pdf

Motions Of Floating Bodies In Time HarmonicWaves

This paper presents an analytical investigation and numerical solutions to the problems of wave radiation and wave diffraction by a submerged sphere. We assume that the fluid is homogeneous, inviscid, and incompressible and the fluid motion is irrotational. The surge and the heave motions are studied and the hydrodynamic coefficients of these motions are calculated. The analytical solutions are obtained by expanding the velocity potential into a series of associated legendre functions in a spherical coordinate system. The problem is also solved numerically based on the boundary integral equation method (BIEM) using non-singular form of the Green's formula. The major advantages of this modified fomulation are that the exact geometry of the body can be applied to solve of the problem and the integral equations are amenable to solution by the quadrature formulas. The results of the computations are presented graphically in the form of non-dimensional parameters and good agreement between analytical and numerical solutions is observed. It is proposed that this modified formulation can be extended to the problem of motion of submerged or floating bodies in waves at forward speed.

/pdf/radiation-and-diffraction-of-a-submerged-sphere-4kebln3kz1.pdf

Radiation and diffraction of a submerged sphere

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Motions Of Floating Bodies In Time HarmonicWaves

Radiation and diffraction of a submerged sphere