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.
Results
Showing 1 to 19 of 19 for “"adaptive meshing"”.
-
Simulations of interfacial dynamics of complex fluids using diffuse interface method with adaptive meshing
… continuously from one phase to the other. Adaptive meshing is applied to produce fine grid near the interface and coarse mesh in the bulk. It leads to accurate resolution of the interface at modest computational costs. An advantage of this method is that topological changes such as …
-
Numerical simulation of fragmentation and spalling and parallelization of a spacetime finite element code
… computational complexity, powerful dynamic adaptive meshing, interface tracking, preservation of characteristic structure and suitability for large-scale parallel computing. The interfacial damage model and dynamic adaptive meshing allow free nucleation and propagation of cracks that are …
-
Numerical Methods for Accurate Computation of Design Sensitivities
… method and investigate the application of adaptive meshing and smoothing projection techniques to enhance the basic scheme. The fundamental ideas are first developed for a one dimensional problem and then extended to 2-D flow problems governed by the incompressible Navier-Stokes equations. …
-
A 3-dimensional H-adaptive algorithm for groundwater flow and contaminant transport
… transient equations. By utilizing unstructured adaptive meshing, concentration is accurately resolved; Benchmark cases were used to check the feasibility of GWADAPT3. The results of the test cases from GWADAPT3 were also compared with results from FEFLOW and FEHM; A simulation of the Yucca …
-
Analysis of a Spacetime Discontinuous Galerkin Method for Systems of Conservation Laws
… spacetime grids, and is well-suited for adaptive meshing and parallelization. Its formulation is consistent with the weak formulation of conservation laws and it naturally suggests a discrete version of the Lax entropy condition. The CSDG method is an explicit method, that is, a direct …
-
Fully anisotropic split-tree adaptive refinement mesh generation using tetrahedral mesh stitching
… and gradation. Fully Anisotropic Split-Tree Adaptive Refinement (FASTAR) is a code that allows the user to exert a great deal of control and ultimately generate a valid, geometry conforming mesh. Due to the split-tree nature and the use of volumetric pixels (voxels), non-unit aspect ratio …
-
Real-time dense simultaneous localization and mapping using monocular cameras
… image regions and simple planar structure to adaptively scale the complexity of the generated keyframe depthmaps to the quality of the input imagery. High-texture image regions are represented at higher resolutions to capture fine detail, while low-texture regions are represented at coarser …
-
Mesh adaptation through r-refinement using a truss network analogy
… In support of establishing a state-of-the-art adaptive meshing tool, boundary vertices are allowed to slide along geometric boundaries in an automated manner. This is achieved via feature identification followed by the construction of 3rd order bezier surface patches over boundary faces. To …
-
On the Potential Impact of Curved Meshing for Higher-order Adaptive Mesh Simulations
Higher order, adaptive finite element methods have demonstrated the ability to significantly reduce the human and computational cost of accurately approximating the solution to partial differential equations (PDEs). In this thesis, we consider the potential advantages of incorporating higher-order …
-
Spacetime damage-based cohesive model for elastodynamic fracture with dynamic contact
… Galerkin (SDG) finite element method. An adaptive meshing procedure generates %When implemented on suitable spacetime grids that satisfy a special causality constraint to enable an efficient patch-by-patch, advancing-front solution scheme with O(N) computational complexity. Per-element …
-
Fully-kinetic PIC simulations for Hall-effect thrusters
… First, due to the high computational cost, fine meshing near boundaries which would have been required to properly resolve wall sheaths was often not attempted. Second, PIC is inherently a statistically noisy method and often the extreme tails of energy distributions would not be adequately …
-
Advances in fully-kinetic PIC simulations of near-vacuum Hall thruster and other plasma systems
… First, due to the high computational cost, fine meshing near boundaries which would have been required to pro]perly resolve wall sheaths was often not attempted. Second, PIC is inherently a statistically noisy method and often the extreme tails of energy distributions would not be adequately …
-
Three dimensional numerical analysis for flow prediction in positive displacement screw machines
… analytical transfinite interpolation method with adaptive meshing to obtain a fully structured 3-D numerical mesh, which is directly transferable to a Computational fluid dynamics (CFD) code. Robust calculations can then be performed while allowing for moving, stretching and sliding between the …
-
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 …
-
Transonic flutter prediction and aeroelastic tailoring for next-generation transport aircraft
… to increase the flutter margin of wings. Adaptive meshing techniques are used to design the topology of the lattice to align with the load direction while adhering to manufacturing constraints, and the lattice is optimized to minimize the structural weight and to improve the flutter …
-
Global/local analysis of laminated panels with cutouts and cracks
… of stresses. Results are compared with adaptive meshing technique, and it is seen that global/local analysis performed equally well. The method is very useful in design and optimization where a large number of analyses have to be performed.
-
The application of adaptive mesh modelling techniques to the study of open ocean deep convection
… With the advent of finite element methods and adaptive meshing techniques, it is now possible to study OODC in regional models without the need to parameterise. One such model, the Imperial College Ocean Model (ICOM) is employed in this thesis for these purposes. ICOM is a 3D finite element, …
-
Adaptive unstructured spacetime meshing for four-dimensional spacetime discontinuous Galerkin finite element methods
… the extension of the existing 2d×time spacetime meshing algorithm known as TentPitcher to 3d×time problems. We review existing work based on TentPitcher. Then, we extend TentPitcher to 3d×time and derive methods for handling mesh adaptivity operations. Next, we describe the software we have …
-
An investigation into the feasibility, problems and benefits of re-engineering a legacy procedural CFD code into an event driven, object oriented system that allows dynamic user interaction
… Control, Gaseous and Solid Phase Combustion, Adaptive Meshing and CAD file interpretation for ease of case specification.