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 542 for “"Meshes"”.
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Anisotropic adaptation: metrics and meshes
We present a method for anisotropic mesh refinement to high-order numerical solutions. We accomplish this by assigning metrics to vertices that approximate the error in that region. To choose values for each metric, we first reconstruct an error equation from the leading order terms of the Taylor …
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Distributed processing of large triangle meshes
… Our system allows to process large triangle meshes by exploiting nothing more than a standard Web browser. A graphical interface allows to select among available algorithms and to stack them into complex pipelines, while a central engine manages the overall execution by exploiting both …
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Layer-adapted meshes for convection-diffusion problems
… the construction and analysis of layer-adapted meshes underlying these numerical methods. An early important contribution towards the optimization of numerical methods by means of special meshes was made by N.S. Bakhvalov in 1969. His paper spawned a lively discussion in the literature with a …
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Hodge Laplacians on simplicial meshes and graphs
… for problems posed on simplicial discretization (meshes) of geometric manifolds and analogous problems on abstract simplicial complexes. We are primarily interested in discretizations of elliptic type partial differential equations, and our model problem is the Hodge Laplacian Poisson problem on …
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Scalable Methods for Processing Massive Geometric Meshes
Polygonal meshes are easily the most common surface representation currently employed in computer graphics, finding application in fields as diverse as the visual arts and scientific computation. Technological advances in the areas of three-dimensional scanning, digital storage, and computer …
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Multi-rate time integration on overset meshes
… or multiscale spatio-temporal features, overset meshes can be effectively used. However, in the case of overset problems in which one or more of the meshes vary significantly in resolution, standard explicit time integrators limit the maximum allowable timestep across the entire simulation domain …
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Deformable meshes for shape recovery: models and applications
… and visualization. In particular, deformable meshes are meshes which can take the deformation of deformable objects. They extend the modelling ability of meshes. This dissertation focuses on using deformable meshes to approach the 3D shape recovery problem.</p> <p>Several models are presented …
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Time-Optimal Algorithms on Meshes With Multiple Broadcasting
… to solve a number of computational problems on meshes with multiple broadcasting have been proposed in the literature.</p> <p>The problems considered in this thesis are semigroup computations, sorting, multiple search, various convexity-related problems, and some tree problems. Based on the size …
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Generation and Optimization of Quadrilateral and Hexahedral Meshes
Structured quadrilateral (quad) meshes are preferred in many engineering and medical applications due to their desired numerical properties. Despite the extensive research, automatic generation of quad- and hex- meshes with optimal structure remains a challenge. In-lieu-of generating a quad-mesh …
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Enhancing Hex-dominant Meshes: Generation, Evaluation, and Simplification
… performing post-processing operations on these meshes. To address these challenges, this dissertation analyzed the demands aligned with the key stages in the meshing pipeline and contributed to the following areas: First, I designed a new hex-dominant mesh generation pipeline with an effective …
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Dynamic Modeling With Implicit Surfaces and Polygonal Meshes
"Morse theory reveals the topological structure of a shape based on the critical points of a real function over the shape. This thesis solves a relaxed form of Laplace's equation to find a ""fair"" Morse function with a user-controlled number and configuration of critical points."
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Effective methods for manipulating and rendering skinned meshes
… LOD scheme can be applied for rendering skinned meshes stored and rendered entirely on the GPU to maximize throughput. We also develop a data management scheme for precomputed radiance transfer to render skinned models with global shading effects.
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Load Balancing Regular Meshes on SMPS with MPI
Domain decomposition for regular meshes on parallel computers has traditionally been performed by attempting to exactly partition the work among the available processors (now cores). However, these strategies often do not consider the inherent system noise which can hinder MPI application …
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Optimization of hydrophobic meshes for oil spill recovery
… led to the development of functionalized steel meshes with hydrophobic and oleophilic surfaces. These meshes can perform oil/water separation in situ, continuously, via capillary action. The goal of this study is to determine the potential of hydrophobic meshes as oil spill recovery devices. A …
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Krylov Subspace Methods for Topology Optimization on Adaptive Meshes
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.
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The linear elastic biaxial response of plain-woven meshes
… elastic constitutive response of plain-weave meshes under biaxial tension and bending. In-plane force-deflection relations are derived through examining a representative element of the mesh. The analysis includes the contributions of tension, bending, and transverse shear to the complementary …
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Multigrid methods for complex engineering geometries and unstructured meshes
… the geometric multigrid to deal with engineering meshes with a small number of poor quality cells, which includes two steps: a global smoother on the whole domain, followed by a local correction on the subdomains with low quality cells. The high frequency error remaining in the low quality regions …
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Aeroelastic computations in the time domain using unstructured meshes
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1996.
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Generation of high quality 2D meshes for given bathymetry
… applies a procedure to generate high quality 2D meshes for any given ocean region with complex coastlines. The different criteria used in determining mesh element sizes for a given domain are discussed, especially sizing criteria that depend on local properties of the bathymetry and relevant …
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