Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"incident waves"”.
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Response of Venice storm gates to incident waves
… motions of the gates forced by a monochromatic incident wave. The gates are assumed to be vertical and the fluid domain is approximated to a channel of infinite length on the Adriatic side and to a semi infinite space on the lagoon side. Several theorems based on Green's formula are developed to …
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The Formation of Edge Waves Under Monochromatic and Random Incident Waves
Edge waves are coastal waves trapped near the shore by reflection and refraction. Previous studies show the excitation mechanism of edge waves under monochromatic wave conditions via phase locking and nonlinear growth. However, how efficiently the mechanism would work under random incident waves …
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Linear and nonlinear resonance of water waves near periodic structures
… array of periodically spaced cylinders trapped waves of certain eigen-frequencies can exist. If there are only a finite number of cylinders in an infinite sea, trapping is imperfect. Simple harmonic incident waves can excite a nearly trapped wave at one of the eigen-frequencies through a linear …
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An investigation into the use of the method of spherical currents for the determination of scattered wave fields
… from convex bodies for plane harmonic incident waves. The method is worked out for the scalar (acoustic) case and applied to sound soft and sound hard obstacles of a given shape. The surface fields and backscattering cross sections of these obstacles are calculated according to the …
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Computational Solution Of Inverse Problems With Simulated Annealing
… focuses on the scattering of acoustic waves by a 2D inhomogeneous medium. In this field, acoustic waves scattered from incident waves are used to reconstruct the index of refraction of the inhomogeneity. The incident waves are time harmonic plane waves which lie in the resonance region. …
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Modeling of nearshore hydrodynamics for sediment transport calculations
… models. To improve the characterization of incident waves, we examine a number of joint probability distributions of wave heights and periods. These distributions are then used to develop a probabilistic wave-by-wave hydrodynamic description based on Tajima's monochromatic wave model. We …
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Three-Dimensional Analysis of Wave Attenuation by Anchored Hemicylindrical Shell
… and the dynamic response of the structure in waves are obtained as a function of the wave number. Two different water depths of 5 m and 6 m are considered. For each water depth, normal and oblique incident waves are considered. The free surface elevation in front of and behind the structure is …
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Feasibility Study of a Linear Generator Wave Energy Converter With Adaptive Bistable Control
… convention is to configure the generator so that incident waves excite the resonant frequency of the device. The irregular and broadband nature of ocean waves poses a challenge to this technique, as the device must be configured to respond to a wide range of incident frequencies. This thesis …
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Quantification of extreme event statistics in ship design
… ensured the slope and amplitude of the incident waves reflected the waves encountered in a given wave spectrum. The remaining discussion explores the value of a near-real-time risk analysis tools in reference to ship design and ship operations, with unique application to Navy and …
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Nonlinear resonance of trapped waves on a plane beach
Linear edge waves were first found mathematically by Stokes (1846). It has long been a topic of interest, since edge waves are believed to be responsible for the formation of beach cusps. Galvin (1965) was the first to observe in the laboratory that edge wave mode of frequency w can be excited by …
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Nonlinear diffraction and refraction of regular and random waves
… and diffraction of infinitesimal water waves, for it reduces the spatial dimension of the linear boundary value problem from three to two. We extend this approximation to nonlinear waves up to the second order in wave steepness, in order to simplify the inherently three-dimensional task. …
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Fast algorithm and surface integral equations for two-dimensional materials modeling
… with linearly polarized and circularly polarized incident waves at the fundamental frequency, respectively. Finally, the radiative heat transfer between two graphene-wrapped objects with arbitrary shapes is studied by a fluctuating-surface current formulation derived from surface integral …
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Power extraction from an oscillating water column along a coast
… some devices for extracting energy from sea waves will likely be installed on the coast. We study here the specific case where an Oscillating Water Column (OWC) is attached to the tip of a long breakwater. A three-dimensional numerical model of a skeletal geometry of the the Foz do Douro …
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Acoustic Scattering by Gratings
… compliance, which is only valid for normally incident waves. We further demonstrate that the homogenised parameter found by our method provides greater accuracy in the low-frequency, low-porosity limit than alternatives.
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Multi-Physics Modeling of Terahertz and Millimeter-Wave Devices
… <p>At the end, an effective method to couple incident waves onto an infinitely thin graphene mono-layer is presented. As will be illustrated, the surface waves along a corrugated metal can efficiently transit into graphene and successfully launch plasmons. </p>
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Dynamics of Ocean Waves in a Continuous Sea Ice Cover
Waves and swell incident on a continuous cover of sea ice can become coupled to the ice and propagate as flexural-gravity waves. These ice-coupled waves are determined by a dispersion equation and attenuation coefficient which depend critically on the material properties of the sea ice. Two models …
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Transient Electromagnetic Waves in Nonlinear Media
… the propagation of transient electromagnetic waves in nonlinear media. It consists of a General Introduction and five scientific papers. The General Introduction gives a broad overview of nonlinear electromagnetic phenomena. The emphasis is on the representation of the constitutive functional …
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Features of nonlinear wave-wave and wave-body interactions
Although nonlinear water waves have been the subject of decades of research, there are many problems that remain unsolved, especially in the cases when one or more of the following factors are involved: high-order nonlinear effects, moving boundaries, wavestructure interactions and complicated …
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Scattering of internal gravity waves
Internal gravity waves play a fundamental role in the dynamics of stably stratified regions of the atmosphere and ocean. In addition to the radiation of momentum and energy remote from generation sites, internal waves drive vertical transport of heat and mass through the ocean by wave breaking and …
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A higher-order method for large-amplitude simulations of bodies in waves
… motion of three-dimensional bodies in waves using a higher-order boundary element method. A 'geometry-independent' approach is adopted in which the representation of the body surface is separated from the discretization of the hydrodynamic solution. Traditional formulations of the …
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