Thèses : « Numerical grid generation (Numerical analysis) Tides »

1

McDonald, Cameron L. « Automatic, Unstructured Mesh Generation for 2D Shelf Based Tidal Models ». Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1550.pdf.

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2

McMorris, Harlan Tom. « Towards hybrid mesh generation for realistic design environments / ». Digital version:, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p9992870.

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3

Raghu, K. K. « Automatic mesh generation and finite element analysis of a triax dome ». Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-03122009-040414/.

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4

Yan, Dongming. « Variational shape segmentation and mesh generation ». Click to view the E-thesis via HKUTO, 2010. http://sunzi.lib.hku.hk/hkuto/record/B43932514.

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5

Yan, Dongming, et 严冬明. « Variational shape segmentation and mesh generation ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B43932514.

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6

Khawaja, Aly Salim. « General semi-structured grid generation for complex 3-D geometries with disparate length scales / ». Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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7

Zhang, Hanzhou. « Mesh generation for voxel-based objects ». Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4148.

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Thesis (Ph. D.)--West Virginia University, 2005.
Title from document title page. Document formatted into pages; contains x, 121 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 110-121).

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Boubez, Toufic I. « Three-dimensional finite-element mesh generation using serial sections ». Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63804.

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9

Pinchuk, Amy Ruth. « Automatic adaptive finite element mesh generation and error estimation ». Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63269.

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10

Sinha, Bhaskar. « Surface mesh generation using curvature-based refinement ». Master's thesis, Mississippi State : Mississippi State University, 2002. http://library.msstate.edu/etd/show.asp?etd=etd-09252002-141359.

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Garg, Ajay. « Automatic mesh generation / ». Online version of thesis, 1990. http://hdl.handle.net/1850/11022.

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Zhou, Jian Ming. « A multi-grid method for computation of film cooling ». Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29414.

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This thesis presents a multi-grid scheme applied to the solution of transport equations in turbulent flow associated with heat transfer. The multi-grid scheme is then applied to flow which occurs in the film cooling of turbine blades. The governing equations are discretized on a staggered grid with the hybrid differencing scheme. The momentum and continuity equations are solved by a nonlinear full multi-grid scheme with the SIMPLE algorithm as a relaxation smoother. The turbulence k — Є equations and the thermal energy equation are solved on each grid without multi-grid correction. Observation shows that the multi-grid scheme has a faster convergence rate in solving the Navier-Stokes equations and that the rate is not sensitive to the number of mesh points or the Reynolds number. A significant acceleration of convergence is also produced for the k — Є and the thermal energy equations, even though the multi-grid correction is not applied to these equations. The multi-grid method provides a stable and efficient means for local mesh refinement with only little additional computational and.memory costs. Driven cavity flows at high Reynolds numbers are computed on a number of fine meshes for both the multi-grid scheme and the local mesh-refinement scheme. Two-dimensional film cooling flow is studied using multi-grid processing and significant improvements in the results are obtained. The non-uniformity of the flow at the slot exit and its influence on the film cooling are investigated with the fine grid resolution. A near-wall turbulence model is used. Film cooling results are presented for slot injection with different mass flow ratios.
Science, Faculty of
Mathematics, Department of
Graduate

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13

Parrish, Michael H. « A selective approach to conformal refinement of unstructured hexahedral meshes / ». Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1985.pdf.

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14

McDill, Jennifer Moyra Jeane Carleton University Dissertation Engineering Mechanical. « An adaptive mesh-management algorithm for three-dimensional finite element analysis ». Ottawa, 1988.

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15

Hu, Guanghui. « Numerical simulations of the steady Euler equations on unstructured grids ». HKBU Institutional Repository, 2009. http://repository.hkbu.edu.hk/etd_ra/1106.

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Hall, Richard H. « CSG based automatic mesh generation using multiple element types / ». Online version of thesis, 1993. http://hdl.handle.net/1850/11438.

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17

Tu, Shuangzhang. « Development of a solution adaptive cartesian-grid solver for 2-D thermochemical nonequilibrium flows ». Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/12477.

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18

Meleschi, Shangari B. « Ultrasonic technique in determination of grid-generated turbulent flow characteristics and caustic formation ». Link to electronic thesis, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0429104-153706.

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Stern, Louis G. « An explicitly conservative method for time-accurate solution of hyperbolic partial differential equations on embedded Chimera grids / ». Thesis, Connect to this title online ; UW restricted, 1996. http://hdl.handle.net/1773/6758.

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20

Balsubramanian, Ravishankar. « Error estimation and grid adaptation for functional outputs using discrete-adjoint sensitivity analysis ». Master's thesis, Mississippi State : Mississippi State University, 2002. http://library.msstate.edu/etd/show.asp?etd=etd-10032002-113749.

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21

Andreeva, Tatiana A. « Ultrasonic technique in determination of grid-generated turbulent flow characteristics ». Link to electronic thesis, 2003. http://www.wpi.edu/Pubs/ETD/Available/etd-1010103-153049.

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22

Cavallo, Peter Angelo Cernansky N. P. « Automated parallel mesh adaptation methods for transient flowfield analyses with fixed or moving boundaries / ». Philadelphia, Pa. : Drexel University, 2006. http://dspace.library.drexel.edu/handle/1860/750.

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23

Scott, Michael Andrew. « Interior node projection techniques in sweeping algorithms / ». Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1121.pdf.

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24

LIANG, SHEN-MIN. « REFINED NUMERICAL SOLUTIONS OF THE TRANSONIC FLOW PAST A WEDGE (OBLIQUE SHOCK) ». Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/187911.

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An adaptive refinement procedure combining the ideas of solving a modified difference equation and of adaptive mesh refinement is introduced. The numerical solution on a fixed grid is improved by inclusion of approximated truncation error computed from local subgrid refinement. Following this procedure, a reliable scheme has been developed for refined computations of the flow past a wedge at transonic speeds. Effects of the truncation error on the pressure, wave drag, sonic line, and shock position are investigated. By comparing the pressure drag on the wedge and the wave drag due to the shocks, the existence of a supersonic-to-supersonic shock originating from the wedge shoulder is confirmed.

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25

Spirkin, Anton M. « A three-dimensional particle-in-cell methodology on unstructured Voronoi grids with applications to plasma microdevices ». Link to electronic dissertation, 2006. http://www.wpi.edu/Pubs/ETD/Available/etd-050506-145257/.

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26

Xu, Kai. « Database support for multi-resolution terrain models / ». St. Lucia, Qld, 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17869.pdf.

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27

Howard, Patricia Ann. « Analysis of mesh strategies for rapid source location in chemical/biological attacks ». Link to electronic thesis, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0430104-144332.

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28

Dimble, Dipesh S. « Geometry modeling for patterned and repetitive configurations ». Birmingham, Ala. : University of Alabama at Birmingham, 2006. http://www.mhsl.uab.edu/dt/2007m/dimble.pdf.

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29

Song, Weihong. « A real space approach to LEED computation with flexible local mesh refinement ». Click to view the E-thesis via HKUTO, 2004. http://sunzi.lib.hku.hk/hkuto/record/B39849004.

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30

Song, Weihong, et 宋慰鴻. « A real space approach to LEED computation with flexible local mesh refinement ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B39849004.

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31

Xia, Sibin. « Isotropic surface remeshing for modern architecture / ». View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?IELM%202008%20XIA.

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32

Tan, Zhijun. « Moving mesh finite volume method and its applications ». HKBU Institutional Repository, 2005. http://repository.hkbu.edu.hk/etd_ra/592.

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33

Calhoun, Donna. « A Cartesian grid method for solving the streamfunction vorticity equations in irregular geometries / ». Thesis, Connect to this title online ; UW restricted, 1999. http://hdl.handle.net/1773/6753.

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34

Ren, Da Qi. « Analysis and design development of parallel 3-D mesh refinement algorithms for finite element electromagnetics with tetrahedra ». Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=103003.

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Optimal partitioning of three-dimensional (3-D) mesh applications necessitates dynamically determining and optimizing for the most time-inhibiting factors, such as load imbalance and communication volume. One challenge is to create an analytical model where the programmer can focus on optimizing load imbalance or communication volume to reduce execution time. Another challenge is the best individual performance of a specific mesh refinement demands precise study and the selection of the suitable computation strategy. Very-large-scale finite element method (FEM) applications require sophisticated capabilities for using the underlying parallel computer's resources in the most efficient way. Thus, classifying these requirements in a manner that conforms to the programmer is crucial.
This thesis contributes a simulation-based approach for the algorithm analysis and design of parallel, 3-D FEM mesh refinement that utilizes Petri Nets (PN) as the modeling and simulation tool. PN models are implemented based on detailed software prototypes and system architectures, which imitate the behaviour of the parallel meshing process. Subsequently, estimates for performance measures are derived from discrete event simulations. New communication strategies are contributed in the thesis for parallel mesh refinement that pipeline the computation and communication time by means of the workload prediction approach and task breaking point approach. To examine the performance of these new designs, PN models are created for modeling and simulating each of them and their efficiencies are justified by the simulation results. Also based on the PN modeling approach, the performance of a Random Polling Dynamic Load Balancing protocol has been examined. Finally, the PN models are validated by a MPI benchmarking program running on the real multiprocessor system. The advantages of new pipelined communication designs as well as the benefits of PN approach for evaluating and developing high performance parallel mesh refinement algorithms are demonstrated.

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35

He, Ting. « [pi]Mesh : practical implementation of a low-cost wireless mesh for indoor networking / ». View abstract or full-text, 2010. http://library.ust.hk/cgi/db/thesis.pl?CSED%202010%20HE.

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36

Wan, Ka-ho, et 溫家豪. « Transition finite elements for mesh refinement in plane and plate bending analyses ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B29478546.

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37

Reu, Taekyu. « Techniques for compressible flow calculations on multi-zone grids ». Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/52327.

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In order to simulate inviscid/viscous compressible flowfields about 3-D realistic aerodynamic bodies, the combined use of an implicit, upwind biased real gas scheme with 3-D fully conservative patched grid techniques is discussed. An "equivalent" gamma formulation is implemented in order to model real gas effects in Van Leer's flux vector splitting (FVS) and Roe’s flux difference splitting (FDS) scheme. A hybrid approximate-factorization (AF)/relaxation algorithm is used as an efficient solver of the Euler, parabolized Navier-Stokes, and thin-layer Navier-Stokes equations. Two different approaches, clipping and Ramshaw’s rezoning algorithms, for performing a conservative flux calculation are described and compared in terms of numerical efficiency. In order to show the real gas \\\ effects in the upwind schemes, two tcst problems are solved. Also to demonstrate the capability of the patched grid approach, the turbulent flowüeld about 3-D analytic forebody is calculated as another test problem. Due to the poor results of the Baldwin-Lomax turbulent model for separated flows, only the attached flowtield is considered in the analytic forebody calculation. Finally, as applications of this approach, the inviscid/viscous flowfields about several aerodynamic bodies are calculated including a generic hypersonic aircraft, a model of the SR-71 aircraft, and F-18 forebody with strakes.
Ph. D.

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38

Murali, Vasanth Kumar. « Code verification using the method of manufactured solutions ». Master's thesis, Mississippi State : Mississippi State University, 2002. http://library.msstate.edu/etd/show.asp?etd=etd-11112002-121649.

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39

Senguttuvan, Vinoad. « Solution adaptive isotropic and anisotropic mesh refinement using general elements ». Master's thesis, Mississippi State : Mississippi State University, 2005. http://library.msstate.edu/etd/show.asp?etd=etd-04062005-104308.

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40

Pattinson, John. « A cut-cell, agglomerated-multigrid accelerated, Cartesian mesh method for compressible and incompressible flow ». Pretoria : [s.n.]m, 2006. http://upetd.up.ac.za/thesis/available/etd-07052007-103047.

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41

Jain, Sachin. « Multiresolution strategies for the numerical solution of optimal control problems ». Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22656.

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Thesis (Ph. D.)--Aerospace Engineering, Georgia Institute of Technology, 2008.
Committee Chair: Tsiotras, Panagiotis; Committee Member: Calise, Anthony J.; Committee Member: Egerstedt, Magnus; Committee Member: Prasad, J. V. R.; Committee Member: Russell, Ryan P.; Committee Member: Zhou, Hao-Min.

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42

Kumar, Amitesh. « Hole patching in 3D unstructured surface mesh ». Birmingham, Ala. : University of Alabama at Birmingham, 2007. http://www.mhsl.uab.edu/dt/2007m/kumar.pdf.

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43

Ray, Tathagata. « Quality delaunay meshing of polyhedral volumes and surfaces ». Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1155212604.

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44

Dorica, Mark. « Novel electromagnetic design system enhancements using computational intelligence strategies ». Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102972.

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This thesis presents a wide spectrum of novel extensions and enhancements to critical components of modern electromagnetic analysis and design systems. These advancements are achieved through the use of computational intelligence, which comprises neural networks, evolutionary algorithms, and fuzzy systems. These tools have been proven in myriad industrial applications ranging from computer network optimization to heavy machinery control.
The analysis module of an electromagnetic analysis and design system typically comprises mesh generation and mesh improvement stages. A novel method for discovering optimal orderings of mesh improvement operators is proposed and leads to a suite of novel mesh improvement techniques. The new techniques outperform existing methods in both mesh quality improvement and computational cost.
The remaining contributions pertain to the design module. Specifically, a novel space mapping method is proposed, which allows for the optimization of response surface models. The method is able to combine the accuracy of fine models with the speed of coarse models. Optimal results are achieved for a fraction of the cost of the standard optimization approach.
Models built from computational data often do not take into consideration the intrinsic characteristics of the data. A novel model building approach is proposed, which customizes the model to the underlying responses and accelerates searching within the model. The novel approach is able to significantly reduce model error and accelerate optimization.
Automatic design schemes for 2D structures typically preconceive the final design or create an intractable search space. A novel non-preconceived approach is presented, which relies on a new genome structure and genetic operators. The new approach is capable of a threefold performance improvement and improved manufacturability.
Automatic design of 3D wire structures is often based on "in-series" architectures, which limit performance. A novel technique for automatic creative design of 3D wire antennas is proposed. The antenna structures are grown from a starting wire and invalid designs are avoided. The high quality antennas that emerge from this bio-inspired approach could not have been obtained by a human designer and are able to outperform standard designs.

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45

Dunkelberg, John S. « FEM mesh mapping to a SIMD machine using genetic algorithms ». Link to electronic version, 2001. http://www.wpi.edu/Pubs/ETD/Available/etd-0104101-102839/.

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46

Howe, Bill. « Gridfields : Model-Driven Data Transformation in the Physical Sciences ». PDXScholar, 2006. https://pdxscholar.library.pdx.edu/open_access_etds/2676.

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Scientists' ability to generate and store simulation results is outpacing their ability to analyze them via ad hoc programs. We observe that these programs exhibit an algebraic structure that can be used to facilitate reasoning and improve performance. In this dissertation, we present a formal data model that exposes this algebraic structure, then implement the model, evaluate it, and use it to express, optimize, and reason about data transformations in a variety of scientific domains. Simulation results are defined over a logical grid structure that allows a continuous domain to be represented discretely in the computer. Existing approaches for manipulating these gridded datasets are incomplete. The performance of SQL queries that manipulate large numeric datasets is not competitive with that of specialized tools, and the up-front effort required to deploy a relational database makes them unpopular for dynamic scientific applications. Tools for processing multidimensional arrays can only capture regular, rectilinear grids. Visualization libraries accommodate arbitrary grids, but no algebra has been developed to simplify their use and afford optimization. Further, these libraries are data dependent—physical changes to data characteristics break user programs. We adopt the grid as a first-class citizen, separating topology from geometry and separating structure from data. Our model is agnostic with respect to dimension, uniformly capturing, for example, particle trajectories (1-D), sea-surface temperatures (2-D), and blood flow in the heart (3-D). Equipped with data, a grid becomes a gridfield. We provide operators for constructing, transforming, and aggregating gridfields that admit algebraic laws useful for optimization. We implement the model by analyzing several candidate data structures and incorporating their best features. We then show how to deploy gridfields in practice by injecting the model as middleware between heterogeneous, ad hoc file formats and a popular visualization library. In this dissertation, we define, develop, implement, evaluate and deploy a model of gridded datasets that accommodates a variety of complex grid structures and a variety of complex data products. We evaluate the applicability and performance of the model using datasets from oceanography, seismology, and medicine and conclude that our model-driven approach offers significant advantages over the status quo.

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47

Blades, Eric Lindsay. « A sliding interface method for unsteady unstructured parallel flow simulations ». Diss., Mississippi State : Mississippi State University, 2004. http://library.msstate.edu/etd/show.asp?etd=etd-10142004-165050.

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48

Hill, Jonathan. « Efficient Implementation of Mesh Generation and FDTD Simulation of Electromagnetic Fields ». Digital WPI, 1999. https://digitalcommons.wpi.edu/etd-theses/1055.

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"This thesis presents an implementation of the Finite Difference Time Domain (FDTD) method on a massively parallel computer system, for the analysis of electromagnetic phenomenon. In addition, the implementation of an efficient mesh generator is also presented. For this research we selected the MasPar system, as it is a relatively low cost, reliable, high performance computer system. In this thesis we are primarily concerned with the selection of an efficient algorithm for each of the programs written for our selected application, and devising clever ways to make the best use of the MasPar system. This thesis has a large emphasis on examining the application performance."

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49

Weber, Matthew B. « Wave Scattering From Infinite Cylindrical Obstacles of Arbitrary Cross-Section ». Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd636.pdf.

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50

Acikgoz, Nazmiye. « Adaptive and Dynamic Meshing Methods for Numerical Simulations ». Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14521.

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For the numerical simulation of many problems of engineering interest, it is desirable to have an automated mesh adaption tool. This is important especially for problems characterized by anisotropic features and require mesh clustering in the direction of high gradients. Another significant issue in meshing emerges in unsteady simulations with moving boundaries, where the boundary motion has to be accommodated by deforming the computational grid. Similarly, there exist problems where current mesh needs to be adapted to get more accurate solutions. To solve these problems, we propose three novel procedures. In the first part of this work, we present an optimization procedure for three-dimensional anisotropic tetrahedral grids based on metric-driven h-adaptation. Through the use of topological and geometrical operators, the mesh is iteratively adapted until the final mesh minimizes a given objective function. We propose an optimization process based on an ad-hoc application of the simulated annealing technique, which improves the likelihood of removing poor elements from the grid. Moreover, a local implementation of the simulated annealing is proposed to reduce the computational cost. Many challenging unsteady multi-physics problems are characterized by moving boundaries and/or interfaces. When the boundary displacements are large, degenerate elements are easily formed in the grid such that frequent remeshing is required. We propose a new r-adaptation technique that is valid for all types of elements (e.g., triangle, tet, quad, hex, hybrid) and deforms grids that undergo large imposed displacements at their boundaries. A grid is deformed using a network of linear springs composed of edge springs and a set of virtual springs. The virtual springs are constructed in such a way as to oppose element collapsing. Both frequent remeshing, and exact-pinpointing of clustering locations are great challenges of numerical simulations, which can be overcome by adaptive meshing algorithms. Therefore, we conclude this work by defining a novel mesh adaptation technique where the entire mesh is adapted upon application of a force field in order to comply with the target mesh or to get more accurate solutions. The method has been tested for two-dimensional problems of a-priori metric definitions as well as for oblique shock clusterings.

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Thèses sur le sujet « Numerical grid generation (Numerical analysis) Tides »

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