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 1926 for “"mesh"”.
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Fully anisotropic split-tree adaptive refinement mesh generation using tetrahedral mesh stitching
… modern computational fluid dynamicists desire to mesh and run solutions on, the need for a robust Cartesian Mesh Generation algorithm is paramount. Not only do Cartesian meshes require less elements and often help resolve flow features but they also allow the grid generator to have a great deal of …
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Truncation Error Based Mesh Adaptation and its Application to Multi-Mesh CFD
… error in a simulation is by performing mesh adaptation. In this work, the mesh adaptation processes are driven by the truncation error, which is the local source of the discretization error. Because this work is focused on methods for structured grids, r-adaptation is used as opposed to …
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Maritime Mesh Network Simulation
… this thesis, we proposed a buoy-based maritime mesh network and analyzed the maritime communication characteristics. Then we proposed a link-state-aware routing protocol to address link blockage problem when routing packets and built a simulator to evaluate the network performance. There are …
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Implementation of two-dimensional time accurate flow simulation on moving mesh exploiting mesh rupturing
A two-dimensional dynamic moving mesh algorithm is implemented for simulating aerodynamic oscillating airfoils. The airfoil is inserted into a uniform unstructured background mesh by exploiting an new technique named mesh rupturing, which allows for significant geometry movement without grid …
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Mesh generation by domain bisection
… three dimensional unstructured tetrahedral meshes. The work on two dimensional triangular unstructured grid generation by Lewis and Robinson [LeR76] is first examined, in which a recursive bisection technique of computational order nlog(n) was implemented. This technique is then extended to …
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Size Function Based Mesh Relaxation
… the problem of relaxing a finite element mesh to more closely match a size function. The main contributions include new methods for performing size function based mesh relaxation, as well as an algorithm for measuring the performance of size function based mesh relaxation methods.</p>
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Mesh modification using deformation gradients
Computer-generated character animation, where human or anthropomorphic characters are animated to tell a story, holds tremendous potential to enrich education, human communication, perception, and entertainment. However, current animation procedures rely on a time consuming and difficult process …
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Mesh generation for implicit geometries
… new techniques for generation of unstructured meshes for geometries specified by implicit functions. An initial mesh is iteratively improved by solving for a force equilibrium in the element edges, and the boundary nodes are projected using the implicit geometry definition. Our algorithm …
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Automatic mesh representation of urban environments
A robust watertight mesh generation framework for urban cityscape and waterscape is proposed. The framework, consisting of a set of algorithms implemented in MATLAB, uses geospatial data available from OpenStreetMap and United States Geological Survey repositories, and incorporates Triangle - a …
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Adaptive mesh refinement for computational aeroacoustics
… SCIENCES Doctor of Philosophy ADAPTIVE MESH REFINEMENT FOR COMPUTATIONAL AEROACOUSTICS by Xun Huang<br/>This thesis describes a parallel block-structured adaptive mesh refinement (AMR) method that is employed to solve some computational aeroacoustic problems with the aim of improving the …
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Tetrahedral Mesh Improvement, Algorithms and Experiments
… of slivers in large three-dimensional Delaunay meshes has been reported as early as 1985. They persist even after treatment with the Delaunay refinement algorithm. Cheng et al. proposed to remove slivers by assigning real weights to the points and change the Delaunay to the weighted Delaunay …
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Adaptive mesh refinement in topology optimization
… constrained topology optimization with Adaptive Mesh Refinement (AMR). Regions with stress concentrations dominate the optimized design. As such, we first present an approach to obtain designs with accurately computed stress fields within the context of topology optimization. To achieve this …
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Human Mesh Recovery Using Radio Signals
… a neural network model that can estimate 3D meshes of the human body in the presence of occlusions, baggy clothes, and bad lighting conditions. We leverage that radio frequency (RF) signals in the WiFi range traverse clothes and occlusions and bounce off the human body. Our model parses such …
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Efficient flooding for wireless mesh networks
Flooding in wireless mesh networks involves distributing some data from one node to rest of the nodes in the network. This dissertation proposes UFlood, a flooding protocol for wireless mesh networks that targets large file transfers, such as software updates, where achieving high throughput …
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Mesh network model for urban area
… the application of new technology, wireless mesh networks. A wireless mesh network can provide improved security, public safety, new economic opportunities, and a bridge that crosses the digital divide. Married to the appropriate applications, a wireless mesh network creates a business model …
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Optimal transmitter placement in wireless mesh networks
Wireless mesh networks are systems of wireless access points interconnected in a mesh to provide digital services to client devices via radio transmission. We consider the challenges of quickly and optimally designing a wireless mesh network. We focus on maximizing client coverage area by choice of …
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