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 33 for “"Adaptive Method"”.
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A parallel adaptive method for pseudo-arclength continuation
We parallelize the pseudo-arclength continuation method for solving nonlinear systems of equations. Pseudo-arclength continuation is a predictor-corrector method where the correction step consists of solving a linear system of algebraic equations. Our algorithm parallelizes adaptive step-length …
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An Adaptive Method for Calculating Blow-Up Solutions
… determination of the value. The numerical methods often use <em>a priori</em> knowledge of the blow-up solution such as monotonicity or self-similarity. For equations where such a priori knowledge is unavailable, <em>ad hoc</em> methods were constructed. The object of this research is to …
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A space-time adaptive method for flows in oil reservoirs
This work presents a space-time adaptive framework for simulating multi-phase flows through porous media, with specific applications to flows in oil reservoirs. A fully unstructured discretization of space and time is used instead of a conventional time-marching approach. For d-dimensional spatial …
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A Parallel Solution-Adaptive Method for Turbulent Non-Premixed Combusting Flows
A parallel adaptive mesh refinement (AMR) algorithm is proposed and applied to the predictions of turbulent non-premixed compressible combusting flows for both two and three space dimensions. The parallel solution-adaptive algorithm solves the system of partial-differential equations governing …
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Adaptive Method of Approximate Particular Solution for One-Dimensional Differential Equations
<p>An adaptive algorithm for the Method Approximate Particular Solution (MAPS) using radial basis functions for solving boundary value problems is discussed in this work. The goal of the adaptive algorithm is to construct an optimal collocation points distribution that gives the required accuracy …
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Investigation of a space-time adaptive method for bluff body flows
… thesis investigates an unstructured spacetime adaptive framework for unsteady ow simulations of the compressible Navier-Stokes equations. A fully-unstructured discretization of space and time is used: for d-dimensional spatial problems, (d + 1)-dimensional meshes are generated, where time is …
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An anisotropic adaptive method for the solution of 3-D inviscid and viscous compressible flows
… sizes have motivated researchers to investigate methods of introducing very high aspect ratio elements to capture these features. In this Thesis, an anisotropic adaptive grid method has been developed for the solution of three-dimensional inviscid and viscous flows by the finite element method. …
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A simplex cut-cell adaptive method for high-order discretizations of the compressible Navier-Stokes equations
While an indispensable tool in analysis and design applications, Computational Fluid Dynamics (CFD) is still plagued by insufficient automation and robustness in the geometry-to-solution process. This thesis presents two ideas for improving automation and robustness in CFD: output-based mesh …
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Grid adaptation for functional outputs of compressible flow simulations
An error correction and grid adaptive method is presented for improving the accuracy of functional outputs of compressible flow simulations. The procedure is based on an adjoint formulation in which the estimated error in the functional can be directly related to the local residual errors of both …
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Learning and feature selection in stereo matching
… independent knowledge, is discussed. Second, an adaptive method for refining the feature set is developed. This adaptive method analyzes the feature error to locate areas of the image which would lead to false matches. Then these areas are used to glide the search through feature space towards …
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Anisotropic output-based adaptation with tetrahedral cut cells for compressible flows
Anisotropic, adaptive meshing for flows around complex, three-dimensional bodies remains a barrier to increased automation in computational fluid dynamics. Two specific advances are introduced in this thesis. First, a finite-volume discretization for tetrahedral cut-cells is developed that makes …
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Moving mesh methods for solving parabolic partial differential equations
In this thesis, we introduce and assess a new adaptive method for solving non-linear parabolic partial differential equations with fixed or moving boundaries, using a moving mesh with continuous finite elements. The evolution of the mesh within the interior of the spatial domain is based upon …
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Proposta e avaliação de um método adaptativo de corte de carga
This work deals with the evaluation of adaptive methods of load shedding. It is understood as adaptive methods, load shedding schemes that are able, through monitoring the state of the network, to estimate the unbalance between the load and the generation of the system and to adapt the amount of …
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The Effects Of Exposure To Feminist Ideology On Women's Body Image
… 1995). Thus researchers have begun to focus on methods of prevention and intervention. Programs utilizing psychoeducation and Festinger's cognitive dissonance theory, for example, have been found to reduce body image dissatisfaction and related symptomatology. The information provided and …
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The role of adaptivity in a numerical method for the Cox-Ingersoll-Ross model
We demonstrate the effectiveness of an adaptive explicit Euler method for the approximate solution of the Cox-Ingersoll-Ross model. This relies on a class of path-bounded timestepping strategies which work by reducing the stepsize as solutions approach a neighbourhood of zero. The method is hybrid …
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Application of Network Reliability to Analyze Diffusive Processes on Graph Dynamical Systems
… estimate increases with system size. Instead, an adaptive method using Bernstein polynomials as kernel density estimators proves useful. Network reliability has a wide range of applications ranging from epidemiology to statistical physics, depending on the description of the functionality. For …
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Uncertainty quantification of vista charring ablator material database using Bayesian inference
… both Pearson correlation coefficients and the method of Sobol; Sobol indices are shown to be a much more robust sensitivity metric in the context of charring ablators. Uncertain parameters of the material database are then calibrated through the use of Bayesian inference rather than basic …
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The Development of an Adaptive Electromagnetic Testing Method
This thesis focuses on the development of an adaptive method for conducting electromagnetic interference testing, which increases the efficiency of this kind of testing. The goal of this kind of testing is to find configurations that result in disturbances on the device under test. Often these …
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An adaptive variational multiscale method with discontinuous subscales for aerodynamic flows
A promising methodology for accurate and efficient simulation of aerodynamic flows is output-based mesh adaptation, which optimizes a mesh to minimize the discretization error in an output of interest. The state of the art in output-based adaptation uses the discontinuous Galerkin (DG) method, …
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Functional Regression and Adaptive Control
The author proposes a novel functional regression method for parameter estimation and adaptive control in this dissertation. In the functional regression method, the regressors and a signal which contains the information of the unknown parameters are either determined from raw measurements or …
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