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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 150 for “"Mesh refinement"”.
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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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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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Cosmic String Radiation with Adaptive Mesh Refinement
… that can address this issue is adaptive mesh refinement (AMR), which allows the resolution of the numerical grid to adapt to the scale of the features of interest in the simulation. This thesis uses GRChombo, a sophisticated code originally designed for numerical relativity, to perform …
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Chemodynamical Adaptive Mesh Refinement Simulations of Disk Galaxies
… I present an update to the N-body and adaptive mesh refinement hydrodynamical code ramses that introduces a more sophisticated feedback treatment, this code is dubbed ramses-ch. Under the new scheme, energetic and elemental feedback is contributed by stars throughout their lifetime rather than …
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An Adaptive Mesh Refinement Scheme for Solidification Problems
Methods for adaptive mesh refinement, based on a quadtree data structure, have been developed with the specific objective of tracking a solid/liquid front in a two-dimensional solidification problem. These methods include mesh refinement and unrefinement algorithms for the finite element method …
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Autonomous hierarchical adaptive mesh refinement for multiscale simulations
… do not require such high resolutions. Adaptive mesh refinement (AMR) addresses this problem by providing a means to perform high-resolution computation only in areas that require it. In the AMR strategy discussed, a nested hierarchy of overlaying grids of increasingly fine resolution--in both …
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Accelerating topology optimization codes using mesh refinement continuation
… which involves a continuation of increasing mesh resolutions to achieve low-compliance solutions with largely reduced computation times. Comparisons with examples from relevant literature show speedups of up to approximately 60% on discretizations up to the order of 106 elements for common …
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Representation Of Dam-Breach Geometry Using Quadtree Local Mesh Refinement
… dams in the United States. Globally refining the mesh to the small cell sizes necessary to resolve small features such as dam breach geometry result in significant computational burden for these types of simulations. This manuscript details the research done to facilitate the implementation of …
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Exploring a Novel Adaptive Mesh Refinement Strategy for High-Speed CFD
<p>Adaptive Mesh Refinement (AMR) techniques to efficiently and robustly achieve grid independent solutions on multi-element unstructured grids is a topic of practical interest within the CFD community.</p> <p>The current effort focuses on the efficiency of a novel Adaptive Mesh Refinement (AMR) …
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Immersed Interface Adaptive Mesh Refinement Methods for Lithium-ion Battery Simulations
… develops novel immersed interface adaptive mesh refinement methods for Li-ion battery simulations. These approaches not only reduce the computational cost of solving the well-known P2D model but also enable multi-dimensional simulations that resolve the complex microstructures of battery …
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A Nodal Approach to Arbitrary Geometries, and Adaptive Mesh Refinement for the Nodal Method
… problems proves that the coarse mesh efficiency of the nodal method can be maintained by taking advantage of ""off the shelf"" advanced solver technology."
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High performance simulations of yield stress fluids in a structured adaptive mesh refinement framework with embedded boundaries
… we utilise spatio-temporal adaptive mesh refinement on structured meshes in this context for the first time. This is achieved through the software framework AMReX, which includes state-of-the-art numerical tools for solving partial differential equations with optimal parallel scaling. …
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Problems in cosmology and numerical relativity
… thesis is the development a stable high order mesh refinement scheme for the solution of hyperbolic partial differential equations. It has now become customary in the field of numerical relativity to couple high order finite difference schemes to mesh refinement algorithms. This approach …
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High fidelity imaging in electrical impedance tomography
… posteriori error estimate on the finite element mesh and implement 2D adaptive mesh refinement techniques in an optimised forward solver. Our results of this novel approach show that a speed-up of approximately an order of magnitude can be obtained. We extend the developed iterative …
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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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Numerical Methods for Computing the Free Energy of Coarse-Grained Molecular Systems
… the solvation free energy by using goal-oriented mesh refinement. Results indicating the benefits of goal-oriented refinement are presented.
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Uma estratégia de refinamento auto-adaptativo versão h do método dos elementos finitos aplicada a problemas bi-dimensionais regidos pela equação de campo
In this work a self-adaptive refinement procedure (h-version) for the Finite Element Method (FEM) solution of two dimensional potential problems is studied. The mesh refinement strategy and the a-posteriori error analysis are also discussed. The Galerkin formulation for FEM is utilized and the …
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Stabilized variational formulation for direct solution of inverse problems in heat conduction and elasticity with discontinuities
… for discretization error, valid in the limit of mesh refinement. We demonstrate convergence of the method with mesh refinement in cases with both continuous and discontinuous solutions. Finally we apply the formulation to measured data to estimate the elastic shear modulus distributions in both …
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