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 72 for “"adaptive mesh refinement"”.
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Adaptive mesh refinement for computational aeroacoustics
… OF ENGINEERING 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 …
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Adaptive mesh refinement in topology optimization
… in stress 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 …
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Cosmic String Radiation with Adaptive Mesh Refinement
… One technique 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 …
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Chemodynamical Adaptive Mesh Refinement Simulations of Disk Galaxies
… Finally, 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 …
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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
… solutions 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 …
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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
… This thesis 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 …
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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
… Specifically, 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 …
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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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Acceleration of Eulerian Multi-Material Methods on Highly Parallel Compute Architectures
… domains of modest size—even when well developed adaptive mesh refinement (AMR) tech- niques are used—since they do not make use of modern GPUs. The work presented in this thesis demonstrates the benefits of utilising modern hardware, particularly GPUs, reduces com- putational time. To ensure that …
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Schur's Complement and Discontinuous Galerkin Methods for Domain Decomposition Solvers and Plasticity and Interface Evolution Analyses
Adaptive methods can be based on either conforming or non-conforming meshes. Though non-conforming meshes are easier to generate, they require the satisfaction of jump conditions across the non-conforming interface. In this work we develop a discontinuous Galerkin framework for such an adaptive …
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A distributed multi-threaded data partitioner with space-filling curve orders
… partitions for regular grids. For irregular meshes, there is still room for improvement. No comparisons have been made for evaluating partitions of datasets without edges. We have deployed these partitions on two large applications - atmosphere simulation in 2D and adaptive mesh refinement in …
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Adaptive Finite Element Methods for Parameter Identification Problems
… algorithms for their solution, based on adaptive finite element methods. Since, in general, the computational effort for solving the arising optimization problems exceeds significantly the cost for a simple simulation, the question of choosing efficient (cheap) discretizations is crucial …
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High-order Discontinuous Galerkin Methods and Deep Reinforcement Learning with Application to Multiscale Ocean Modeling
… with the integration of observational data and adaptive methods. As scientists strive to better understand multiscale ocean processes, the thirst for comprehensive simulations has proceeded apace with concomitant increases in computing power, and submesoscale resolutions where nonhydrostatic …
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Adaptive Finite Element Computation of Chemical Flow Reactors
… method is derived from recent techniques for adaptive mesh refinement that allows to reduce numerical effort and nevertheless achieving good or even better accuracy in the data that may be of interest compared to a straightforward tensor product approach.
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Galerkin Projections Between Finite Element Spaces
Adaptive mesh refinement schemes are used to find accurate low-dimensional approximating spaces when solving elliptic PDEs with Galerkin finite element methods. For nonlinear PDEs, solving the nonlinear problem with Newton's method requires an initial guess of the solution on a refined space, which …
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Multi-physics Diffuse Interface Methods For Computational Material Modelling
… highly parallelisable, compatible with adaptive mesh refinement, and straightforward to implement. Moreover, the method facilitates the incorporation of different physical processes with ease. This allows the method to be validated by comparing to experiment and existing numerical …
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