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 11 of 11 for “"unbounded domain"”.
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Consistent description of radiation damping in transient soil-structure interaction
… interaction problems are characterized by an unbounded soil-domain and thus by radiation damping. This radiation damping arises due to wave propagation from the excited structure into the subsoil and may lead to a reduction of the structural response. A consistent description of this radiation …
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Difração e refração de ondas: uma análise por meio de elementos finitos e infinitos
… program with elements that model an infinite domain: they are called Infinite Elements. By studying the existing Infinite Elements it was possible to formulate a new and efficient one. Its geometrical characteristics are the same as for the Isoparametric Finite Element, but the integration is …
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The role of background flow variations in stratified flows over topography
… topography in a horizontally and vertically unbounded domain - the flow configuration most pertinent to atmospheric applications - combined with absorbing viscous layers at the upper and lateral boundaries of the computational domain. Using this model, a study is first made of the effect of …
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On finite element solutions for bounded time-harmonic scattering problems with an exact nonlocal boundary condition.
… years. These problems are originally posed in an unbounded domain, but to easily discretize the domain, we will instead restrict to a finite, bounded domain and utilize the finite element method to solve the resulting problem. This restriction demands an additional boundary condition that …
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Intrinsic Ultracontractivity and Other Properties of Mixed Barrier Brownian Motions
… motions with Dirichlet boundary condition on an unbounded domain D above the graph of a bounded Lipschitz function. We discover that the large time behavior of the Dirichlet heat kernel pD = pD(t , x, y), for x, y ∈ D is limt→infinity td+22pD t,x,y=C1u xuy, where u is a minimal harmonic …
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Volterra difference equations
… the existence of bounded solutions on an unbounded domain of more general nonlinear Volterra sum-difference equations using the Schaefer fixed point theorem and the Lyapunov direct method. The fifth paper examines the asymptotic behavior of nonoscillatory solutions of higher-order …
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On numerical methods for direct and inverse problems in electromagnetism
… the wave propagation problem in high frequency domain is studied. Study of electromagnetic materials and their behavior is of a huge interest for the technological world. Its importance originates from the increasing requirements for high performance devices as motors, transformers, radars,... …
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Epistemic Uncertainty Quantification in Scientific Models
… the encapsulation problem to be in a bounded domain such as a hypercube; (2) does not require the solution of the encapsulation problem to converge point-wise. In the current formulation, the encapsulation problem could reside in an unbounded domain, and more importantly, its numerical …
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Wave induced response of sea floor deposits : a simple model for sands and nonlinear analysis by FEM
… boundary is suggested to deal with the unbounded domain, which is easy to implement in the finite element program and universal to apply to nonlinear analysis. One important conclusion obtained from the numerical analyses is the influence of the coefficient of permeability on the …
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Development of high-order doubly asymptotic open boundaries for wave propagation in unbounded domains by extending the scaled boundary finite element method
… simulation of wave propagation problems in unbounded domains, including homogeneous semi-infinite layers with a constant depth, homogeneous full-planes with a circular cavity and semi-infinite layered systems. The proposed open boundaries are necessary for dynamic and seismic analyses of …
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Studies on secondary instabilities
… flow as prototypes of wall bounded Hows and unbounded Hows, respectively. In the Blasius flow we have concentrated on studying detuned modes. We found the growth rates of modes slightly detuned from the subharmonic wavelength to be almost as large as the growth rate of the subharmonic itself. …