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 21 for “"Boundary element methods"”.
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Galerkin boundary element methods with multiwavelets
In general the numerical solution of boundary integral equations arising from the reformulationof partial differential equations leads to full coefficient matrices. The discretesystem can be solved in O(N2 ) operations by iterative solvers of the ConjugateGradient type possibly with a …
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High Order Technologies in Boundary Element Methods: Analyses, Algorithms, Applications
L'abstract è presente nell'allegato / the abstract is in the attachment
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Paradigms for Fast and Stable Boundary Element Methods in Computational Electromagnetics
L'abstract è presente nell'allegato / the abstract is in the attachment
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Exploring the Limits of Boundary Element Methods for Wave Energy Converter Hydrodynamics
Boundary element methods (BEM) are used to calculate frequency-domain representations of hydrody-namic forces for moored and floating objects such as wave energy converters (WECs). The representations– excitation, added mass, and radiation damping in up to six degrees of freedom– define and scale …
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An Investigation of Boundary-Based Field Analysis Methods for Electric Machines: The Schwarz-Christoffel and Boundary Element Methods
The results indicate that boundary-based methods, although not ideal for machine design by themselves, have certain aspects that complement traditional domain-based methods. They therefore merit further study in this context.
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On the boundary integral equation method for the solution of some problems for inhomogeneous media / Mohammad Ivan Azis.
This thesis employs integral equation methods, or boundary element methods (BEMs), for the solution of three kinds of engineering problems associated with inhomogeneous materials or media: a class of elliptical boundary value problems (BVPs), the boundary value problem of static linear elasticity, …
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The dual boundary element method applied to semi-infinite surface cracks in two-dimensions
… the DBEM. We first detail the derivations of the boundary element and dual boundary element methods. The main difficulty with these methods are integrations of the singular integrals which cannot be accuartely evaluated via standard Gauss quadrature schemes. An analytical integration scheme has …
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A generalized precorrected-FFT method for electromagnetic analysis
Boundary Element Methods (BEM) can be ideal approaches for simulating the behavior of physical systems in which the volumes have homogeneous properties. These, especially the so-called "fast" or "accelerated" BEM approaches often have significant computational advantages over other well-known …
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Efficient Mixed -Domain Analysis of Electrostatic Microelectromechanical Systems (Mems)
… the exterior electrostatic domain. Conventional methods for coupled domain analysis, such as finite element/boundary element methods (FEM/BEM), require mesh generation, mesh compatibility, re-meshing and interpolation of solution between the domains. Mesh generation can be difficult and time …
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Modeling and Analysis of Plasma-Assisted Etching Reactor Phenomena
… of a microscopic cavity was simulated using Boundary Element methods and a moving boundary scheme. Gas-phase ion scattering and ion defocusing owing to local, lateral electric field forces in the near-cavity region, resulted in loss of etch anisotropy even in the absence of chemical …
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The growth of fractures in the Earth
… rate criterion by means of both the finite element and the boundary element methods. Although this approach is computationally intensive, it is indispensable for this type of problem because other criteria cannot account for the friction effect on the fracture faces. We use a repulsion …
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Modelling the Endothelial Glycocalyx Layer
… that are lined with an EGL. We describe a new boundary-integral representation for Biphasic Mixture Theory, which allows us to efficiently solve elastohydrodynamicmobility problems using Boundary Element Methods. In this context, we examine the impact of geometry upon creation of viscous …
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Reconstruction Resolution Of Coherent Point Sources With Helmholtz Equation Least Squares
… spatial resolution than previous generation NAH methods such as Fourier Acoustics and Inverse Boundary Element Methods. The NAH guidelines dictate that spatial resolution decreases with increasing stand-off distance and decreasing Signal to Noise Ratio (SNR). Also, in methods other than HELS, …
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A diffraction integral based turbomachinery noise shielding method
… of the shielding method. High fidelity methods, such as for example boundary element methods, are computationally expensive and not amenable for optimization framework integration. On the other hand, low fidelity methods, such as the barrier shielding method, are limited in their source …
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Fluid flow induced by oscillating bodies and flows in cyclones
… truncation technique and finite-difference methods are used to obtain solutions for cascades of normal flat plates and square cylinders. By assuming that the streaming Reynolds number is 0(1) then the outer streaming flows for cascades of square cylinders, normal flat plates and circular …
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A Boundary Element Method for Thermo-poroelasticity with Applications in Rock Mechanics
… treatment and need to be solved numerically. The boundary element method (BEM) has proven suitable for the poroelastic and thermoelastic problems. In this thesis, a two-dimensional transient indirect BEM is developed to solve coupled thermoporoelastic problems.</p><p>The indirect BEM has two …
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Massively parallel engineering simulations on graphics processors: parallelization, synchronization, and approximation
… between the parallel work units. The final element of the trio refers to the necessity for judicious choice of approximations to the underlying physical laws of the simulation model which can greatly impact both the parallelism and synchronization needs of the simulation implementation. The …
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Efficient modeling of sound source radiation in free-space and room environments
… with traditional ESM’s, or acoustical holography methods in general, the model developed in the present work possesses two efficiency improvements: (1) the use of the series of monopoles, dipoles, quadrupoles, etc. as equivalents sources (since in predicting the sound field, the multipole series …
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Computations of fully nonlinear three-dimensional wave-body interactions
… nonlinear effects. A highly efficient high-order boundary element method is developed based on the framework of the quadratic boundary element method (QBEM) for the boundary integral equation and using the pre-corrected fast Fourier transform (PFFT) algorithm to accelerate the evaluation of …
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2-D Modeling of Electromagnetic Waves with Vibrating Conducting and Dielectric Objects
… convolutional perfectly matched layer boundary conditions and an advanced surface boundary condition that accommodates the surface perturbations of the vibrating objects. Reflection and diffraction of incident plane waves are calculated for stationary and vibrating objects and the …
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